| 2012 |
12-0001 |
Maximum width of Support Brackets for Handrails |
19/03/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0001 INTERPRETATION Page 1 of 1
Interpretation Date: March 19, 2013
Building Code Edition: BC Building Code 2012
Subject: Maximum width of support brackets for handrails
Keywords: Handrail, graspability
Building Code Reference(s): 3.4.6.5.(3); 9.8.7.5.(2)
Question:
What is the maximum cross-section width of support brackets for handrails that is acceptable?
Interpretation:
There is no maximum cross section width for support bracket regulated by the Code. All supports for handrails will restrict continuity of graspability of handrails. The design of handrail supports should minimize those interruptions.
Sentences 3.4.6.5.(3) and 9.8.7.5.(2) of the Building Code require attention to the ergonomic design of handrails and as a minimum stipulates the shape, minimum and maximum dimensions and circumference of acceptable handrails. These requirements together with the principal of continuously graspable handrail fulfill Objective Statements OS3.1 OS3.7 and protect public as per Functional Statements F10 and F30.
The images below show commonly used designs that provide good balance between strong grip and firm support. The first three images are preferable. The fourth and the fifth are breaking the grip in much higher degrees, however are commonly used in many applications.
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| 2012 |
12-0002 |
Travel Distances in Storage Garages |
26/02/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0002 INTERPRETATION Page 1 of 3
Interpretation Date: February 26, 2013
Building Code Edition: BC Building Code 2012
Subject: Travel Distances in Storage Garages
Keywords: Travel distance, storage garage
Building Code Reference(s): 3.3.5.7., 3.4.2.4., 3.4.6.7., 3.8.3.3.
Question:
What is the appropriate method for measuring travel distances in an underground storage garage?
Interpretation:
Since there are many variations in designs of storage garages, the most appropriate method for measuring travel distances for a particular design is left to the discretion of the registered professional in consultation with the authority having jurisdiction.
The following design criteria can be used as a basis for measuring travel distances in underground storage garages:
1. As described in Sentence 3.4.2.4.(1), travel distance in an underground storage garage is measured from the most remote location in the floor area to the nearest exit door that leads directly to an exit stair.
2. The travel distance is measured along the path of travel that an occupant would use to reach the exit stair door, assuming that all of the parking stalls are occupied with vehicles.
3. other than the egress path from an occupant's own vehicle, or between tandem parking stalls, the path of travel cannot traverse between 2 parked vehicles, unless there is an 1100 mm wide dedicated pedestrian walkway between such vehicles. This pedestrian walkway should be delineated to indicate the dedicated pedestrian walkway (refer to Labels B and E on the drawing on Page 3).
4. If the exit stair has a vestibule as required by Article 3.3.5.7., the travel distance is measured to the exit stair door rather than to the vestibule entrance door (refer to Labels C & Don the drawing on Page 3). If the vestibule is mechanically pressurized under fire alarm conditions, and there are no other rooms opening onto the vestibule, it may be appropriate to measure travel distance to the vestibule entry door rather than the exit stair door (refer to Labels A & B on the drawing on Page 3). This should be reviewed with the authority having jurisdiction.
5. As permitted by Sentence 3.4.2.4.(2), travel distance can be measured from a suite or room entry door, rather than from the most remote location within the suite or room, when the suite or room is separated from the remainder of the floor area with a fire separation having a fire resistance rating of not less than 45 minutes, AND the egress door from the suite or room opens onto an exterior passageway or a corridor that is separate from the remainder of the floor area.
6. Travel distance from rooms that open directly into the storage garage, such as service rooms or storage rooms, must be measured from the most remote location within the room to the nearest exit stair door along the path of travel used by an occupant. As noted in Item 5 above, the travel distance cannot be measured to the room entry door (refer to Label A on the drawing on Page 3).
7. If the internal layout of a room is fixed at the time of the design (e.g. an emergency generator room), the travel distance can be measured along the pedestrian walkway between the contents within the room.
8. If the internal layout of the room is not fixed or known at the time of the design, the travel distance is measured from the most remote corner of the room using 90° corners for the path of travel (i.e. you cannot travel diagonally across a room since it could be filled with furnishings or equipment - refer to Label A on the drawing on Page 3).
9. Travel distance within the storage garage itself can be measured diagonally across drive aisles because it is reasonable to assume that there will not be any contents within drive aisles which could obstruct the path of travel (refer to Labels B & C on the drawing on Page 3).
10. Drive aisles can be used as a means of egress, without any increase in the drive aisle width, provided that the ramp slopes do not exceed those described in Article 3.4.6.7.
11. It should be noted that if a floor area in a storage garage contains parking stalls for persons with disabilities, the slope of the drive aisle in the accessible path of travel cannot exceed 5% when no handrails are provided. If the drive aisle slope exceeds 5%, then dedicated accessible ramps are required in accordance with Article 3.8.3.3.
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| 2012 |
12-0003 |
Continuity of Air and Vapour Barriers at Pot Light Penetrations |
17/03/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0003 INTERPRETATION Page 1 of 2
Interpretation Date: March 17, 2015
Building Code Edition: BC Building Code 2012 (Revised Dec 19, 2014)
Subject: Continuity of Air and Vapour Barriers at Pot Light Penetrations
Keywords: Air Barrier; Vapour Barrier
Building Code Reference(s): 9.25.3.; 9.25.4.3.(2); A-9.25.3.1, 9.36.2.10.(7)
Question:
Subsection 9.25.3 Air Barriers and Subsection 9.25.4 Vapour Barriers, require thermally insulated wall, floor and ceiling assemblies to be constructed with air and vapour barriers so as to provide a barrier to leakage of air and diffusion of water vapour from the interior into wall spaces, floor spaces, attic or roof spaces.
Are pot light assemblies permitted to penetrate the air/vapour barrier located in the floor/ceiling spaces?
Interpretation:
Yes.
In conventional wood frame construction the air barrier and vapour barrier are combined as a single element. The Building Code acknowledges that building services (such as, for electrical, plumbing, mechanical systems) will penetrate the air/vapour barrier. However, the building code requires that penetrations through this membrane for these services (including pot light fixtures) be sealed as air tight as possible. In order to achieve this, the building code recommends that special care be taken in the design and construction of the wall, floor and ceiling assemblies to maintain the continuity of the air/vapour barrier. The objectives are to limit the quantity of moisture penetrating the assembly to a level that will dry sufficiently fast enough to avoid material deterioration and the growth of mold (refer to A-9.25.3.1.) and to limit energy losses caused by penetrations in the air or vapour barriers.
Similar to other electrical service penetrations there are products available to facilitate sealing the service penetration through the air/vapour barrier. For example, polyethylene boots are available for electrical outlet boxes. The continuity of the air/vapour barrier is achieved by taping the polyethylene boot to the polyethylene sheet used on the wall or ceiling.
Additional caution should be provided to the selection of the appropriate pot light assembly. Pot lights are listed for "insulated ceilings" (IC) and "non-insulated ceilings" (NIC).
IC pot lights typically incorporate the air/vapour barrier into the pot light housing assembly. Some NIC pot lights can use a polyethylene boot to maintain the continuity of the air/vapour barrier for use in insulated ceiling applications.
Care should also be taken to maintain the required clearances between pot lights and adjacent combustible materials. IC pots lights are typically designed for zero clearance to adjacent combustible materials, but NIC pot lights can present a fire hazard if they are in close proximity to adjacent combustible materials. Refer to the pot light manufacturer's installation instructions for guidance.
It should be noted that Article 9.36.2.10. of the December 19, 2014 revisions to the 2012 BCBC has additional requirements for the construction of air barriers.
Sentence 9.36.2.10.(1) requires that materials used for air barriers must comply with CAN/ULC-S741.
Sentence 9.36.2.10.(2) requires that air barriers materials must be compatible with adjoining materials and must be free from holes and cracks.
Provided that the installation of the pot lights meets these requirements by maintaining the continuity of the air barrier, they are permitted to penetrate the air/vapour barrier membrane.
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| 2012 |
12-0004 |
Combustible & Non-combustible Pipe Transitions |
21/05/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0004 INTERPRETATION Page 1 of 2.
Interpretation Date: May 21, 2013
Building Code Edition: BC Building Code 2012
Subject: Combustible & Non-combustible Pipe Transitions
Keywords: Fire Stop Assemblies, Transitions
Building Code Reference(s): 2.2.10.4.(2) ; 3.1.9.2.(1) ; 3.1.9.4.; 3.2.1.2.; 9.10.9.7.
Question:
As transitions of combustible and non-combustible DWV are permitted in Part 7 of the BCBC where can they take place when buildings are constructed above a common 3.2.1.2. concrete slab fire separation?
Interpretation:
Where a project consists of a single or multi storey building constructed on top of a common parking garage the concrete slab above the parking garage is constructed in accordance with Article 3.2.1.2.and the pipe penetrations must include a listed fire stop assembly with a minimum FT rating.
Articles 3.1.9.4. and 9.10.9.7. require the fire stop assembly to be tested in accordance with ULC-S115-05 with a pressure differential of 50 Pa between the exposed and unexposed sides of the penetration , with the higher pressure on the exposed side. Also Sentence 3.1.9.2.(1) states that all combustible components of a fire stop assembly must be in place at the time of testing.
Part 8 of ULC-S115-05 indicates that the testing apparatus for piping being tested through the fire separation must extend to the dimensions noted above and below the fire stop penetration being tested. This would mean that any pipe couplings, connectors or transition fittings must be in the testing apparatus and if the test successfully obtained the necessary rating the added fittings would be noted in the listing drawing. Such is the case where
cUL-F-B-2009 received a 2HR-FT rating with combustible piping through the separation and a transition coupling to non-combustible pipe located at 12 inches above the concrete fire separation.
Further information can be obtained in previous Interpretation 06-0070 that explains in detail where pipe transitions can occur above the 3.2.1.2.concrete slab fire separation where
Part 3 multi storey buildings are constructed on top of the slab. Note that the 915mm dimension for transitions above the concrete slab is used because it would be above the required height of the fire stop assembly test apparatus indicated in ULC S115-05.
Also, previous Interpretation 98-0160 shows the same 915mm dimension for pipe transitions where buildings without horizontal fire separations at the floor levels above the parking garage concrete slab are constructed on top of a 3.2.1.2.concrete fire separation.
While a transition can be made anywhere above the noted 915mm any proposed transition below that point and the top of the slab must have a listed fire stop assembly that includes a transition fitting in the listing drawing for the chosen fire stop assembly through the concrete slab
It is also noted that where transition fittings are installed Sentence 2.2.10.4.(2) of the BC Plumbing Code requires the mechanical couplings be certified in compliance with CAN/CSA -B602 Standard for Mechanical Couplings used with DWV piping.
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| 2012 |
12-0005 |
Fire Separation around Service Room Serving one Suite |
19/02/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0005 INTERPRETATION Page 1 of 1
Interpretation Date: February 19, 2013
Building Code Edition: BC Building Code 2012
Subject: Fire separation around service room serving one suite
Keywords: Fire separation, service room, fuel-fired appliances
Building Code Reference(s): 3.6.2.1.(2)
Question:
Is a 1h fire separation enclosure required for a service room containing a natural gas furnace, located in a one storey club building with 450m2 floor area, used as a seniors drop-in centre? The building is operated as a single tenancy, is of combustible construction, is unsprinklered and has a monitored fire alarm system.
Interpretation:
No.
Sentence 3.6.2.1.(2) provides that except as required by Sentence 3.6.2.1.(3), a fuel-fired appliance that serves only one room or suite is not required to be installed in a service room separated from the remainder of the building.
Therefore provided the natural gas furnace serves only the drop-in centre, and the drop-in centre meets the definition of a suite per the Building Code, then a fire separation enclosure is not required for the service room containing the natural gas furnace.
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| 2012 |
12-0006 |
Smoke Alarms Locations within Dwelling Unit |
19/02/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0006 INTERPRETATION Page 1 of 1
Interpretation Date: February 19, 2013
Building Code Edition: BC Building Code 2012
Subject: Smoke alarms locations within dwelling unit
Keywords: Smoke alarms, storeys, split level, sleeping rooms, living areas
Building Code Reference(s): 9.10.19.3.(1)
Question:
Subclause 9.10.19.3.(1)(b)(i) requires that smoke alarms be installed in every sleeping room within a dwelling unit. However the Division B Appendix 9.10.19.3.(1) commentary has no mention at all of this requirement. Is this consistent with Subclause 9.10.19.3.(1)(b)(i)?
Interpretation:
Yes.
Subclause 9.10.19.3.(1)(b)(i) is the acceptable solution reference requiring that smoke alarms be installed in every sleeping room within a dwelling unit.
The Division B Appendix 9.10.19.3.(1) commentary discusses only the smoke alarm location aspects outside of the sleeping room, as addressed in clause 9.10.19.3.(1)(a) and Subclause 9.10.19.3.(1)(b)(ii); and only clarifies the smoke alarm location criteria for the "living areas" that constitute the storeys of the dwelling unit. The commentary uses the example of split level configurations.
This Appendix commentary does not discuss the interpretation of Subclause 9.10.19.3.(1)(b)(i) requiring the smoke alarms within the sleeping rooms, as the code reference is deemed to be sufficiently clear for that requirement.
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| 2012 |
12-0007 |
Fire Detectors in Elevator Hoistways |
19/03/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0007 INTERPRETATION Page 1 of 3
Interpretation Date: March 19, 2013
Building Code Edition: BC Building Code 2012
Subject: Fire detectors in elevator hoistways
Keywords: Fire detectors, smoke detectors, heat detectors, sprinklers, elevator hoistway, elevator machine room
Building Code Reference(s): 3.2.4.11, 3.2.4.12
Question:
If a sprinkler is provided to protect an elevator hoistway, is any other fire detection required inside the hoistway?
Interpretation:
No.
However, this may still be required for certain types of elevator hoistways.
Sentence 3.2.4.11.(4) requires fire detectors referenced in Sentence 3.2.4.11.(2), to be installed in an elevator hoistway, if a sprinkler is .not installed in the elevator hoistway. The referenced Sentence 3.2.4.11.(2) applies only to unsprinklered buildings in which case there would not be any sprinkler provided in the elevator hoistway anyway.
However even in a fully sprinklered building there are situations where the elevator hoistway is exempt from having to provide sprinklers, for example under NFPA 13 references 8.15.5.2 and 8.15.5.5. It may also not be desired for various other reasons to provide sprinklers in the hoistway. This includes factors such as concerns of discharge of sprinkler water affecting electrical components of the elevator system and the added complexities and provisions of avoiding this, including by pre-emptive system shut downs. It might also be desired to eliminate sprinklers in the hoistway and related automatic elevator shutdown, in order to facilitate reliable use of the elevators under emergency conditions, such as for elevators designated for Firefighters Emergency Operation (FEO) or for firefighters elevators in high buildings. In such cases it is interpreted that in the absence of sprinklers in the hoistway, either heat detectors or smoke detectors are required to be provided in the elevator hoistway.
However what is not clearly stated, is whether if sprinklers are provided in the hoistway, is any other fire detection required. Review of the various related regulations and standards, including NFPA 13, CSA B44-07, and good engineering practice considerations suggests additional fire detection may still be necessary in certain situations.
Clause 3.2.4.12.(1)(g) requires smoke detectors to be provided in elevator machine rooms. The Building Code does not currently have any definition of elevator machine room, therefore it seems appropriate to refer to the definition provided in the elevator standard CSA B44-07. Definitions are provided therein for control rooms, control spaces and
·machinery spaces which consider the various machine-room-less (MRL) elevators that are now commonly available and used. Most references in the elevator standard to a "machine room" have been replaced with "elevator machine room, machinery space, control space, or control room". Most requirements of the elevator standard for machine rooms therefore apply also to control rooms, control spaces and machinery spaces.
In some cases depending on the elevator type and configuration, the hoistway could contain components traditionally found in an "elevator machine room"; would also fall under this definition, and would therefore have to be provided with smoke detection.
Depending on the type of levator and hoistway design therefore, it is possible that automatic sprinklers (if no sprinkler exemption available) and smoke detectors would both be necessary in an elevator hoistway. In such cases the benefit of smoke detection for example, would be at least to activate before the sprinklers, thereby initiating elevator recall before sprinkle s have an opportunity to activate and potentially cause damage.
It is noted also that the forthcoming elevator standard CSA B44-2010 has been amended and will require smoke detection in machine rooms, control rooms, control spaces and machinery spaces whereas the current B44-07 standard only requires this in Canada for the "machine room" portion.
It is currently considered good practice to have smoke detection in control rooms, control spaces and machinery spaces (some of these spaces may actually be located in the hoistway depending on the type and configuration of the elevator).
If the Building Code were to interpret that fire detectors are not required if a sprinkler is present in the hoistway, then it will be in conflict with CSA B44-2010 when it comes to MRL type elevators, as CSA B44-2010 indicates a smoke detector is required in a machinery space, which is typically at the top of the hoistway. The appropriate CSA B44-2010 excerpt is as follows:
"2.27.3.2.2
In jurisdictions enforcing the NBCC, smoke detectors, or heat detectors in environments not suitable for smoke detectors (fire alarm initiating devices), used to initiate Phase I Emergency Recall Operation, shall be installed in conformance with the requirements of the NBCC, and shall be located
(a) at each floor served by the elevator
(b) in the associated elevator machine room, machinery space containing a motor controller or
electric driving machine, control space, or control room"
(The phrase "jurisdictions enforcing the NBCC" is meant to distinguish Canadian jurisdictions as opposed to those in USA)
Where fire detectors other than sprinklers are necessary, consideration also needs to be given to providing practical access for servicing, testing and maintenance of fire detection devices. Access doors in fire separations, used to facilitate such servicing, must be listed and have the appropriate fire protection rating.
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| 2012 |
12-0008 |
Area and Location of Exposing Building Faces (of Houses) |
18/06/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0008 INTERPRETATION Page 1 of 4
Interpretation Date: June 18, 2013
Building Code Edition: BC Building Code 2012
Subject: Area and Location of Exposing Building Faces (of Houses)
Keywords: Glazed openings, limiting distance, exposing building face
Building Code Reference(s): 9.10.15.2; 9.10.15.4.
Question:
It is proposed to construct the exterior wall of a house such that it steps away from the property line in 3 segments (A, B & C) which will have limiting distances of 1.2 m, 2.0 m and
3.0 m, respectively;
1. How does Sentence 9.10.15.2.(2) apply to this stepped exposing building face?
2. Can EBF's with Limiting distances greater than 2.0 m be subdivided into smaller EBF's (such as segment C in this example)?
Interpretation:
1. In conformance with Sentence 9.10.15.2.(2) since segments A & B have limiting distances of 2.0 m or less, no further subdivision of these EBF's are permitted and the EBF area is determined by adding the EBF area of segments A&B (Figure 1). The combined area of the exposing building faces of segments A&B are used in Table
9.10.15.4. Maximum Area of Glazed Openings in Exterior Walls (of houses), to determine the maximum area of glazed openings permitted in EBF's A & B.
2. Yes. For other than houses the code requires the EBF area to be determined by the exterior wall elevation coinciding with an interior fire compartment (Figure 2a). For houses the area of EBF's is not limited provided EBF's have limiting distances greater than 2.0 m (Figure 2b).
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| 2012 |
12-0009 |
Exterior Egress and Exit Passageways |
18/03/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0009 INTERPRETATION Page 1 of 3
Interpretation Date: March 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Exterior Egress and Exit Passageways
Keywords: Access to exit, Exit, Means of Egress, Exterior Passageway, Exterior Exit Passageway
Building Code Reference(s): 3.2.3.13.; 3.3.1.15.; 3.4.1.5.(1); 3.4.4.1.(1); 3.4.4.3.;
Question:
1. What is the difference between an exterior passageway leading to an exit per Article
3.3.1.15. and an exterior exit passageway per Article 3.4.4.3.?
2. In either case, if the criteria described in Article 3.4.4.3 to waive the requirements of Sentences 3.4.4.1.(1), 3.2.3.13.(1) and (3) are not met, is the passageway simply provided with a fire-resistance rating and exposure protection at windows between it and adjacent suites?
Interpretation #1:
Exterior Passageway
The exterior passageway per Article 3.3.1.15. is an access to exit leading to a required exit. An example would be the elevated exterior corridor providing access for all the rooms of a motel to the exit stair at each end.
Sentences 3.3.1.3.(8) and (9) requires each of those rooms of the motel shall have a doorway into that exterior passageway and at the point where the doorway enters the exterior passageway it shall be possible to go in opposite directions to each of the two separate exits.
3.4.2.4.(2)(b)(i) permits the travel distance from the motel room to be measured from the egress door of that room if it opens to an exterior passageway to the nearest exit.
Sentence 3.2.2.12.(1) requires an elevated exterior passageway such as those in a motel shall be constructed as a mezzanine with a fire-resistance rating as per 3.2.2.
Although exterior passageway is an access to exit Sentence 3.3.1.15.(1) requires an exterior passageway to conform to the requirements of Section 3.4. for exterior exit passageways and that includes exit fire separations and exit exposure protection.
However, Sentence 3.4.4.3.(1) exempts the exterior passageway from having to be fire separated from the remainder of the building (including the motel rooms) as per Sentence 3.4.4.1.(1) and having to comply with exit exposure protection as per Sentences 3.2.3.13.(1) and (3) if not less than 50% of the exterior sides of the passageway is open to the outdoors and an exit stair is provided at each end of the passageway.
The exit stair at each end is not exempted from the fire separations as per 3.4.4.1.(1) and exit exposure protection per 3.2.3.13. If the exit stair is an interior stair exit fire separations shall applied between the exterior passageway and the exit stair as well as between the exit stair and the remainder of the floor area. If the exit stair is an exterior stair it is not required to enclose the stair but to provide exit exposure protection from· the inside between the open stair and the exterior walls of the building as per BCAB#1687; however, the exterior stair would not be required to be separated from the open exterior passageway since the passageway is not considered as the exterior walls of the buildings.
It is also permitted to have a 6 m dead end public corridor beyond the exit stair at end of the exterior passageway provided the public corridor fire separations are maintained between the dead end corridor and the suites served by that corridor. There is no separation required between the public corridor and the exterior passageway as per BCAB#1725.
Exterior Exit Passageway
The exterior exit passageway per Article 3.4.4.3. is within or part of an exit leading from an exit to an acceptable open space or a thoroughfare. An example would be the exterior walkway leading from an exit stair to the street along the side of a builc;ling.
Sentence 3.4.1.5.(1) specifies that access to an exterior exit passageway from a floor area shall be through exit doors at the floor levels.
re is no limit on travel distance within the exterior exit passageway or a requirement to travel in two directions to reach the street or open space.
Exit fire separations and exit exposure protection shall apply to exterior exit passageway except as exempted by 3.4.4.3.(1).
Interpretation #2
In the case of exterior passageway, such as the elevated exterior corridor serving motel rooms, if the criteria described in Article 3.4.4.3. are not met then the exterior passageway can be treated as
1. a public corridor and shall comply with all the requirements of a public corridor including fire separations between the exterior passageway and the rooms as per Article 3.3.1.4. and between the exterior passageway and the exit stairs at each end as per Sentence 3.4.4.1.(1), or
2. an exit corridor and shall comply with Section 3.4 including exit fire separations between the passageway and the rooms as per Sentence 3.4.4.1.(1) and subject to exit exposure requirements as per Sentences 3.2.3.13.(1) and (3).
In the case of exterior exit passageway, such as exterior walkway leading from an exit to an open space or a public thoroughfare, if the criteria described in Article 3.4.4.3. are not met then the exterior exit passageway shall comply with Section 3.4 including exit fire separations between the passageway and the adjoining building exterior walls as per Sentence 3.4.4.1.(1) and subject to exit exposure requirements as per Sentences 3.2.3.13.(1) and (3).
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| 2012 |
12-0010 |
Protection of Roof Soffits |
19/11/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0010 INTERPRETATION Page 1 of 2
Interpretation Date: November 19, 2013
Building Code Edition: BC Building Code 2012
Subject: Protection of Roof Soffits
Keywords: Roof soffits
Building Code Reference(s): 9.10.15.5.(10); A-3.2.3.6.(2)
Question:
Clause 9.10.15.5.(10)(a) requires that roof soffits projecting within 1.2 m from the property line shall have no openings. If the portion of the roof soffits projecting closer than 1.2 mis protected according to 9.10.15.5.(10)(b) are openings permitted in those portion of roof soffits that is further than 1.2 m from the property line?
Interpretation:
No
Sentence 9.10.15.5.(10) states that where roof soffits project to less than 1.2 m from the property line, the centre line of a lane or public thoroughfare or an imaginary line between two buildings or fire compartments on the same property, they shall have no openings and shall be protected by material as stated in Clause (b).
Appendix A-3.2.3.6.(2) explains that the reason to provide protection of soffits is to slow down the fire from inside the roof space of the subject building exiting the unprotected soffits and expose the adjacent building to flames as a result of unpredictable plume geometry/behavior.
It is interpreted that the entire depth of the soffit along that exposing building face shall have no openings where any portion of that soffit is located closer than 1.2 m from the property line.
The attached sketches explain the applications of this requirement.
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| 2012 |
12-0011 |
Detached Carports |
18/03/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0011 INTERPRETATION Page 1 of 3
Interpretation Date: March 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Detached Carports
Keywords: carports, exposing building face, spatial separation; glazed openings
Building Code Reference(s): 9.10.15.1.(1); 9.10.14.1.(1); 9.10.14.4.(10),
9.10.14.4.(11); 9.10.14.5.(4); 9.10.14.5.(7);
9.35.2.1.
Question:
What requirements of spatial separation should apply to a detached carport serving a single family dwelling?
Interpretation:
Subsections 9.10.14 and 9.10.15. regulate requirements of spatial separation between buildings. Sentence 9.10.15.1.(1) states that "this Subsection applies to buildings that contain only dwelling units and have no dwelling unit above another dwelling u,nit", therefore, Subsection 9.10.15. only applies to a single family dwelling but does not apply to a detached carport serving that single dwelling unit.
Sentence 9.10.14.1.(1) states that "this Subsection applies to buildings other than those to which Subsection 9.10.15. applies"; therefore, Subsection 9.10.14. applies to a detached carport serving a single family dwelling.
There are five Sentences 9.10.14.4.(10) and (11) and 9.10.14.5.(4), (5) and (7) that regulate the requirements for garages or accessory buildings that serves a single dwelling unit.
Though these five sentences do not mention carport but carport can be considered as a garage or an accessory building without any exterior walls; therefore, carport shall comply with these five sentences as follow:
9.10.14.4.(10):
Except as provided in Sentence 9.10.14.4.(11) for carport that serve a single dwelling unit only and is detached from any building, the maximum aggregate area of glazed openings shall comply with the requirements for unprotected openings. BCAB #1707 ruled that the open side of an attached carport to a side by side duplex does not constitute glazed openings; therefore, a detached carport would comply with the maximum aggregate area of glazed openings.
9.10.14.4.(11):
The limits on the area of glazed openings stated in Sentence 9.10.14.4.(10) need not apply to the exposing building face of a detached carport facing a dwelling unit, where
a) the detached carport serves only one dwelling unit,
b) the detached carport is located on the same property as that dwelling unit, and
c) the dwelling unit served by the detached carport is the only major occupancy on the property.
9.10.14.5.(4):
Except as provided in Sentence 9.10.14.5.(5), where a carport serves one dwelling unit only and is detached from any building, the exposing building face
a) need not conform to the minimum required fire-resistance rating stated in Table 9.10.14.5.A, where the limiting distance is 0.6 m or more,
b) shall have a fire-resistance rating of not less than 45 min, where the limiting distance is less than 0.6 m, and
c) need not conform to the type of cladding required by Table 9.1b.14.5.A, regardless of the limiting distance.
9.10.14.5.(5):
The requirements regarding fire-resistance rating, type of construction and type of cladding need not apply to the exposing building face of a detached carport facing a dwelling unit, where
a) the detached carport serves only one dwelling unit,
b) the detached carport is located on the same property as that dwelling unit, and
c) the dwelling unit served by the detached carport is the only major occupancy on the property.
9.10.14.5.(7):
Except as provided in Sentences 9.10.14.5.(9) to (11), Sentence 9.10.14.5.(6) shall not apply to
a) buildings containing 1 or 2 dwelling units only, and
b) detached carports, where
i) the detached carport serves only one dwelling unit,
ii) the detached carport is located on the same property as that dwelling unit, and
iii) the dwelling unit served by the detached carport is the only major occupancy on the property.
It is interpreted that a detached carport serving a single family dwelling and is located less than 0.6 m from a property line the exposing building face of the carport shall be fully enclosed with a wall having a fire-resistance rating of not less than 45 min.
The roof soffits of a detached carport serving a single family dwelling shall comply with Sentence 9.10.14.5.(9) to (11).
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| 2012 |
12-0012 |
Shared Laundry Room, Fire Separations for Single Family Dwelling with a Secondary Suite |
18/02/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0012 INTERPRETATION Page 1 of 3
Interpretation Date: February 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Shared laundry room, fire separations for single family dwelling with a secondary suite
Keywords: Shared laundry room, secondary suite, fire exceptions
Building Code Reference(s): 9.10.9.14.(1), 9.36.2.15.(1), 9.36.2.16.(1)
Question:
1. Sentence 9.10.9.14.(1) requires that residential suites be separated from adjacent rooms and suites by 3/4h fire separations (1h for dwellings consisting of 2 or more storeys including basements).
Does this include all walls between a shared laundry room and remainder of a building, containing a secondary suite, whether access into the shared laundry room is via the suites or via a shared egress / access corridor?
2. Secondary suites are required to comply with Part 9 except as permitted in Section 9.36. Does this mean that the exceptions or alternatives given in Sentence 9.36.2.15.(1) can be applied to the separation walls of a shared laundry room serving suites of a building containing a secondary suite?
3. Would the assembly above a shared laundry room be required to have the same fire separation requirements as indicated for the enclosing walls?
Interpretation:
1. No.
The Appendix B commentary A-9.36.1.2 indicates Part 9 requirements apply to the construction of a secondary suite, except as referenced under Subsection 9.36.2.
For a building containing a secondary suite, Article 9.36.2.15 addresses the fire separation requirements for suites and Article 9.36.2.16 addresses the fire separation requirements for public corridors. The intent of these Articles is to provide for alternative methods of maintaining adequate fire separations between the suites. Often the shared laundry room can be considered an integral part of the main suite, as illustrated in the attached drawings #2 & #3.
However if a shared laundry room is not considered part of a suite, such as when it is accessed only off a shared public corridor, then it must be separated froin the adjacent suites and public corridor. For this latter situation, there are 3 options available for the grade of fire separation
quired for all the separating walls of the shared laundry room:
a) 3/4h fire separation
b) 1/2h fire separation if suites are equipped with smoke alarms in accordance with Article 9.36.2.19.
c) Unrated fire separation if building is sprinklered.
2. Yes.
Refer to the answer given to question 1.
3. Yes.
If the construction assembly over the shared laundry room forms part of a required fire separation between the shared laundry room and the suites or shared egress space for the building, such assembly must be consistent with the requirements for the vertical fire separation enclosures.
Note that effective December 19, 2014, Section 9.36 will be repealed and replaced with Section 9.37, in accordance with the Province of British Columbia Local Government Act, Ministerial Order No. M111.
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| 2012 |
12-0013 |
Fastening of Wood Stair Stringers |
15/10/2013 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0013 INTERPRETATION Page 1 of 1
Interpretation Date: October 15, 2013
Building Code Edition: BC Building Code 2012
Subject: Fastening of wood stair stringers
Keywords: Wood stair stringers, support, secure, fasten
Building Code Reference(s): 9.8.9.4.(1)(b)
Question:
For buildings that are regulated by Part 9, Clause 9.8.9.4.(1)(b) requires that wood stair stringers be "supported and secured top and bottom".
1. Does this mean that the wood stair stringers must be mechanically fastened to the floor or stair landing assembly at both the top and bottom?
2. Is it acceptable to support the wood stair stringer at the bottom by simply resting the stringer on a concrete floor slab?
Interpretation:
1. Yes - the requirement of Clause 9.8.9.4.(1)(b) that a wood stair stringer be "secured" at the top and bottom means that the wood stair stringer must be mechanically fastened to the floor or landing assembly.
2. No - the wood stair stringer must be mechanically fastened to the concrete floor slab.
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| 2012 |
12-0014 |
Sway Bracing and Seismic Restraint for Piping |
18/02/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0014 INTERPRETATION Page 1 of 2
Interpretation Date: Feb 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Sway Bracing and Seismic Restraint for Piping
Keywords: Sway Bracing, Seismic Restraint
Building Code Reference(s): 2.3.4.1.(1); 2.3.4.2.(1); 2.3.4.5.(1)(2)(6) ; 2.3.4.5.(5)(a):
3.2.5.12(1); 4.1.8.18
Question:
This project includes a long 12ft wide by 10ft tall tunnel for service piping. The piping consists of a 12 inch stainless steel fire and domestic water main, a 6 inch galvanized sanitary force main, as well as 10 inch and 14 inch System 15 PVC-DWV storm drains.
What regulates the pipe hanger spacing, sway bracing, and seismic restraint for all of the noted piping systems?
Sentence 2.3.4.5.(2) references Table 2.3.4.5. for the maximum hanger spacing for all types of piping and would include the storm drains and the sanitary force main. Sentence 2.3.4.2.(1) requires independent support for all such pipe hangers. Sentence 2.3.4.1.(1) requires supports to be capable of keeping the pipe in alignment and supporting the weight of the pipe and its contents
Sentences 2.3.4.1.(1) and 2.3.4.5.(1)(2) make reference to providing some form of sway bracing for all piping systems but do not indicate any details on how to achieve an acceptable level of protection for the DWV piping and the sanitary sewer force main. However, while the placing of sway bracing would be site specific based on the diameters and length of the pipe hanger rods, sway bracing must be acceptable to the AHJ and, where applicable, a Professional Engineer of Record must be provided to ensure that it achieves adequate protection from misalignment of the piping that could cause pipe joint failures.
Clause 2.3.4.5.(5)(a) indicates the minimum diameters for pipe hanger rods where used for pipe support in all buildings.
Also, Sentence 2.3.4.5.(6) states that where a pipe hanger is attached to concrete or masonry it shall be fastened by metal or expansion-type plugs that are inserted or built into the concrete or masonry.
Since this building has a combined fire protection and domestic water service it is a sprinklered building, so Sentence 3.2.5.12.(1) requires compliance with NFPA 13-2007 which includes ULC or cUL listing for the sprinkler pipe material and the detailed installation requirements for sway bracing and seismic restraint for the fire protection system. The requirements of NFPA 13 do not apply to the sanitary and storm piping systems.
Where a building is subject to the structural requirements of Part 4, all supports for piping systems must be designed and installed in accordance with Article 4.1.8.18.. This would include seismic restraint considerations for the combined fire and domestic water service, the sanitary force main, and the storm drains as indicated in Table 4.1.8.18.
One other issue with this question is that, at this time, the proposed use of stainless steel piping for the combined water service serving the fire protection and the domestic systems would not be permitted, since the BC Plumbing Code does not reference this as an approved material for use in a water system.
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| 2012 |
12-0015 |
Fire Separation and Means of Egress from Roof-top Enclosure |
19/05/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0015 INTERPRETATION Page 1 of 2
Interpretation Date: May 19, 2015
Building Code Edition: BC Building Code 2012
Subject: Fire separation and means of egress from roof-top enclosure
Keywords: Roof-top enclosures, service room, fire separation, egress
Building Code Reference(s): 3.1.8.3.(2)(c); 3.2.5.3.(1)(b), 3.3.1.3.(5)&(6); 3.3.1.14.(2);
3.6.2.1.(10)
Question:
This project is a one-storey building with multiple suites and multiple major occupancies (Groups A, D and E). The building has a roof-top enclosure that is less than 200 sq.m. which contains with fuel fired mechanical equipment. This roof-top enclosure straddles 2 separate suites below, so the fire separation wall between 2 adjacent suites is directly beneath the roof-top enclosure. Subsection
3.2.2. does not require the roof assembly to have any fire resistance rating for this building based on size and occupancy.
1. Is the walking surface of the roof-top enclosure required to be constructed as a fire separation with a fire-resistance rating to satisfy the requirements of Sentence 3.6.2.1.(1)?
2. Can the fire separation wall between the 2 adjacent suites terminate at the underside of the roof assembly below the roof-top enclosure?
3. Can the means of egress from a roof-top enclosure be via a roof access hatch and fixed ladder?
Interpretation:
The answer to these questions depends upon the type of roof-top enclosure. The term "roof-top enclosure" is not defined the building code, so it could take a variety of forms. For example it could simply be a weather protection cover over a roof-top appliance that is open on the sides (i.e. an umbrella). Alternatively it could be a fully enclosed "service room" containing fuel-fired mechanical equipment.
The following answers apply to a weather protection cover:
1. No - Refer to previous interpretation 06-0046. The building code requirements for this issue have not changed from the 2006 BCBC to the 2012 BCBC. A vertical fire separation demising wall that separates 2 suites niay terminate at the underside of the roof deck as per 3.1.8.3.(2)(c)
2. Yes - There is no requirement to provide fire separation between a roof-top appliance and the building it serves - see 3.6.2.1.(10).
3. Yes - Access to and egress from a "roof' is permitted to be via a fixed ladder and a roof hatch as per Clause 3.2.5.3.(1)(b).
The following answers apply to an enclosed rooftop service room:
1. Yes - The walking surface of an enclosed roof-top service room would be considered to be a floor rather than a roof deck. In order to maintain the continuity of the vertical fire separation wall between adjacent suites, the wall may terminate at the underside of a floor assembly, provided that the floor assembly is constructed as a fire separation with the same fire resistance rating as required for the demising wall between the 2 adjacent suites as per Clause 3.1.8.3.(2)(a) and Sentence 3.1.8.3.(4).
2. Yes - provided the roof assembly is constructed as a fire separation as noted in Item 1 above.
3. No - Clause 3.3.1.3.(5)(a) permits a roof-top enclosure to have an access to exit that leads to an exit that is located on the storey immediately below the roof.
Sentence 3.3.1.14.(2) waives the stair rise and run requirements for "stairs" that serve service spaces that are intended for occasional use for servicing equipment and machinery.
A vertical fixed ladder is not considered to be a "stair" for the purposes of Sentence 3.3.1.14.(2).
Note also that access to service equipment is also subject to the requirements of WorkSafe BC and access to elevator machine rooms is subject to the requirements of the BC Safety Authority. |
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| 2012 |
12-0016 |
Fasteners for Membrane Roofs |
18/02/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0016 INTERPRETATION Page 1 of 1
Interpretation Date: February 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Fasteners for membrane roofs
Keywords: fasteners, membrane roofs, horizontal surface
Building Code Reference(s): 9.26.2
Question:
1. Clause 9.26.2.1.(1)(i) references CGSB 37-GP-56M, "Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing." Are these roofing systems permitted to be fastened with fasteners such as referenced in Articles 9.26.2.2. and 9.26.2.3?
2. If these roofing systems can be fastened with fasteners such as referenced in Articles 9.26.2.2. and 9.26.2.3; can they be installed on minimum slope surfaces?
Interpretation:
1. Yes.
The referenced roofing systems are permitted to be fastened by nails as referenced in Article
9.26.2.2. Standard CGSB 37-GP-56M covers 3 methods of membrane installation: fully adhered, partially attached, and loosely laid. As indicated in the standard and its appendix guidelines, mechanical fastening may be used for the partially attached method and around the perimeter for loose laid systems, in accordance with the requirements of the selected systems and manufacturers' specifications.
Sentence 3.26.2.2.(4) and Article 9.26.2.3 refer only to the use of nails or staples for shingles; these references are not applicable for membrane roof systems.
2. Yes.
The referenced roofing systems are permitted to be fastened by nails as referenced in Article 9.26.2.2; however, there are minimum sloping requirements as set out in Article 9.26.1.1 and Subsection 9.26.3. Table 9.26.3.1 requires a minimum 1 in 50 slope for modified bituminous membranes. Sentence 3.26.2.2.(4) and Article 9.26.2.3 refer only to the use of nails or staples for shingles, and these references are not applicable for membrane roof systems.
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| 2012 |
12-0017 |
Building Classification...withdrawn |
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| 2012 |
12-0018 |
Construction Sequencing...file closed, not an interpretation issue |
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| 2012 |
12-0019 |
Combustible Components in Exterior Walls in Noncombustible Buildings |
18/02/2014 |
BC,APEGBC,BOABC,POABC
File No: 12-0019, INTERPRETATION Page 1 of 7
Interpretation Date: February 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Combustible components in exterior walls in noncombustible buildings
Keywords: Combustible components, noncombustible buildings, exterior walls, exterior cladding
Building Code Reference(s): 3.1.4.2., 3.1.5.1.(1), 3.1.5.5., A-3.1.5.5., 3.1.5.12.,
3.2.3.8.
Question:
This interpretation is an update to the previous Interpretation 06-0090 which was based on the 2006 BCBC. The 2012 BCBC has amended the wording of both Articles 3.1.5.5. and 3.2.3.8. with respect to the use of combustible components in exterior walls, including foamed plastic insulation.
For Part 3 buildings that are required to be noncombustible construction:
1. Does Article 3.1.5.5. apply when an exterior non-loadbearing wall assembly does not contain combustible cladding?
2. Does Article 3.1.5.5. apply when an exterior loadbearing wall assembly does not contain
combustible cladding?
3. If an exterior non-loadbearing wall assembly contains combustible cladding, does Article
3.1.5.5. apply to the entire exterior wall assembly?
4. Can minor combustible components be installed in an exterior non-loadbearing wall that contains combustible cladding even though such components were not included in the CAN/ULC-S 134 test assembly?
5. Are factory-assembled exterior wall panels that contain foamed plastic insulation as described in Sentences 3.1.5.12.(6) & (7) also subject to the requirements of Article 3.1.5.5.?
6. Is combustible cladding permitted on a loadbearing wall assembly?
7. For the purposes of Article 3.1.5.5., how is the term "cladding" defined?
8. Is foamed plastic insulation permitted in an exterior wall where the maximum permitted area of unprotected opening is not more than 10% of the exposing building face?
Interpretation:
1. No
The wording of Article 3.1.5.5. has been amended in the 2012 BCBC to clarify that it only applies to exterior walls that contain "Combustible Cladding".
2. No
Article 3.1.5.5. only applies to non-loadbearing exterior wall assemblies.
3. Yes
Appendix A-3.1.5.5. clarifies that the required test, CAN/ULC-S134, "Standard Method of Test of Exterior Wall Assemblies" is to be conducted on the entire exterior wall assembly in order to assess the performance of the entire assembly. That is, the performance of some exterior cladding systems may depend on the wall assembly to which they are attached.
4. Yes, with conditions
Combustible components that would have a negligible impact on the results of the CAN/ULC S134 test can be installed in an exterior wall with combustible cladding, even though such components were not included in the test assembly. Refer to BC Building Code Appeal Board decision #1682.
Combustible components that are described in Sentence 3.1.5.1.(2), Articles 3.1.5.2., 3.1.5.3., 3.1.5.6., 3.1.5.10.,, 3.1.5.11., 3.1.5.18., 3.1.5.19. and 3.1.5.20. are considered to have a
negligible impact on the results of the CAN/ULC-S134 test.
5. No
Factory assembled exterior wall panels that meet the requirements of either Sentence 3.1.5.12.(6) or (7) do not have to be tested to CAN/ULC-S134.
6. No, with the exception of gypsum board as permitted by Article 3.1.5.11.
Sentence 3.1.5.1.(1) prohibits the use of combustible components in buildings that are required to be noncombustible construction, except as permitted by Sentences 3.1.5.1.(2) to (4) and Articles 3.1.5.2. to 3.1.5.21., 3.1.13.4. and 3.2.2.16.
Article 3.1.5.5. permits the use of combustible cladding on non-loadbearing exterior wall assemblies, but none of the other exceptions to Sentence 3.1.5.1.(1) address the use of combustible cladding on loadbearing exterior walls.
7. Since there are innumerable types of exterior wall assemblies it is difficult to clearly define for all wall types which portion of an exterior wall assembly constitutes the "cladding" component. In principle, combustible components, particularly foamed plastic insulation, that are located near the exterior surface of a wall assembly could represent a fire hazard for fire spread up the exterior face of the building. If there is no thermal barrier between foamed plastic insulation and the exterior surface of the wall assembly, there is a potential for fire spread up the face of the building.
Some examples of combustible cladding would include EIFS, metal or glazing spandrel panels with sprayed foamed plastic insulation immediately adjacent to the metal or glazing.
8. No
The wording of Sentence 3.2.3.8.(1) in the 2012 BCBC has been amended so that it only applies to exterior walls where the maximum permitted area of unprotected opening is greater than 10% of the exposing building face.
Sentence 3.2.3.8.(1) prohibits the use of foamed plastic insulation in an exposing building face in a building that is more than 3 storeys in building height, unless the foamed plastic is protected on the outside face with not less than 25 mm thick concrete or masonry, or a noncombustible material that meets the test requirements of CAN/ULC-S101, including the additional requirements of Sentence 3.2.3.8.(2).
Sentence 3.2.3.8.(1) applies to combustible buildings, noncombustible buildings, loadbearing
walls and non-loadbearing walls when the building height exceeds 3 storeys.
When the maximum permitted area of unprotected opening is not more than 10% of the exposing building face, the provisions of Sentence 3.2.3.8.(1) do not apply, so foamed plastic insulation is not permitted anywhere within the exterior wall assembly.
Similarly the provisions of Sentence 3.2.3.8.(3) do not apply, so the use of combustible cladding systems that meet the requirements of Article 3.1.5.5. is not permitted when the maximum permitted area of unprotected openings is not more than 10% of the exposing building face. This is further clarified in the new Sentence 3.1.5.5.(2) of the 2012 BCBC.
It should also be noted that Article 3.1.4.2. (for combustible buildings) and Article 3.1.5.12. (for noncombustible buildings) require a thermal barrier to protect the interior face of wall and ceiling assemblies that contain foamed plastic insulation.
Note: This Interpretation supersedes Interpretation 98-0012 which was based on the 1998 BC Building Code and 06-0090 which was based on the 2006 BC Building Code.
Refer to the attached drawings for examples of acceptable use of combustible components in exterior walls in a building that is required to be noncombustible construction and where the maximum permitted area of unprotected opening is greater than 10% of the exposing building face.
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| 2012 |
12-0020 |
Drop-in Anchors |
18/03/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0020 INTERPRETATION Page 1 of 1
Interpretation Date: March 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Drop-in Anchors
Keywords: Power-actuated fasteners, drop-in anchors
Building Code Reference(s): 4.1.8.18.(1), 4.1.8.18.(2), 4.1.8.18.(8)(d)
Question:
Can power-actuated fasteners or drop-in anchors be used to support elements and components of buildings listed Table 4.1.8.18. for seismic tensile loading?
Interpretation: No.
Sentence 4.1.8.18.(8) requires connections to the structure of elements and components listed in Table 4.1.8.18. be designed to support the component or element for gravity loads, to accommodate building deflections and the element or component deflections, and shall be designed for lateral force, Vp, as described in Sentence 4.1.8.18.(1).
Clause 4.1.8.18.(8)(d) states that power-actuated fasteners and drop-in anchors shall not be used for tension loads.
The NBC 2010 Structural Commentaries explained that "power-actuated connections, such as nails and bolts in concrete and shallow drop-in-type anchors, shall not be used for tension loading. This restriction is placed on these types of connections because of their inability to withstand the cyclic tensile loading imposed by seismic response."
Sentence 4.1.8.18.(2) exempts Categories 6 through 21 of Table 4.1.8.18. from having to be designed for lateral force, Vp, for buildings in low seismic area, other than post-disaster buildings, where IEFaSa(0.2) is less than 0.35.
It is interpreted that power-actuated fasteners and drop-in anchors cannot be used in post disaster buildings and buildings where IEFaSa(0.2) 0.35 if they are subject to cyclic tensile loading imposed by seismic response.
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| 2012 |
12-0021 |
Graspability of Handrails |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0021 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Graspability of Handrails
Keywords: Handrails, Ergonomic Design
Building Code Reference(s): 3.4.6.5.(3); 9.8.7.5.(2); A-9.8.7.5.(2)
Question:
Is a handrail with a cross section of 140 mm x 38 mm an acceptable profile to satisfy graspability requirements of Sentences 3.4.6.5.(3) & 9.8.7.5.(2)?
Interpretation:
No.
Sentence 3.4.6.5.(3) and 9.8.7.5.(2) and Table A-9.8.7.5.(2) in Appendix A describe the ergonomic requirements for the design of the handrail profile with provision of examples of acceptable shapes. It also notes that "Acceptable handrail sections include, but are not limited to, those shown... ". It implies that the main objective is to provide profile that is "graspable" and allows the fingers to wrap around the profile to increase holding grip and not relying only on friction and strength of the grip.
The Appendix A clarification leaves open the detailed design options to the designers and AHJ, but requires that the design provides wrapping a handrail with the hand and fingers in order to increase the holding function for people with limited strengths. Profiles that allow wrapping the fingers around due to their size and shape are acceptable and the profiles that rely on "pinch" grip are unacceptable.
Note, that Part 3 Sentence 3.4.6.5.(3) requirements are more stringent.
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| 2012 |
12-0022 |
Loadbearing Wall |
18/03/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0022 INTERPRETATION Page 1 of 2
Interpretation Date: March 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Loadbearing Wall
Keywords: Loadbearing wall, fire separation, fire-resistance rating, fire-rated ass mbly, fire stop, fire block
Building Code Reference(s): 3.1.7.5., 3.1.9.; 3.1.11.
Question:
A wood floor assembly acting as a fire separation with a fire-resistance rating is supported . by wood-framed loadbearing walls having the same fire-resistance rating.
1. Should all penetrations of the loadbearing walls, such as ducts, pipes, wiring, etc. be fire stopped?
2. Should all openings of the loadbearing walls., such as electrical panels, doors and windows be protected with rated closures?
Interpretation:
1. Yes
If a floor or roof assembly is required to have a fire-resistance rating all loadbearing walls, columns and arches supporting such floor or roof assembly shall have a fire-resistance rating not less than that required for the supported floor or roof assembly as per Sentence 3.1.7.5.(1).
Sentence 3.1.9.1.(1) requires all penetrations of a fire separation or a membrane forming part of an assembly required to have a fire-resistance rating be sealed by a fire stop, cast in place or tightly fitted.
Since the wood-framed loadbearing wall relies on the drywall membrane to achieve the required fire-resistance rating all penetrations of such a membrane shall be fire-stopped in order to achieve the required fire-resistance rating unless they are specifically exempted in Subsection 3.1.9.
2. No
Assemblies required to having a fire-resistance rating, such as loadbearing walls, columns and arches only have to "withstand the passage of flame and the transmission of heat for the required time when exposed to fire ...." They are not fire separations acting as barriers against the spread of fire.
Since the loadbearing wall is not required to act as fire separation, opening such as doors, windows, vents, electrical and communication panels, are not required to be protected with fire-rated closures as long as the fire-resistance rating of the loadbearing wall is not affected. In some situations, such as around windows and doors, it is appropriate to use fire blocks as per Subsection 3.1.11. to maintain the integrity of the fire-resistance rating.
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| 2012 |
12-0023 |
Mechanical Joint Couplings Used in Non-Combustible Buildings |
18/02/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0023 INTERPRETATION Page 1 of 1
Interpretation Date: February 18, 2014
Building Code Edition: BC Building Code 2012
Subject: Mechanical Joint Couplings Used In Non-Combustible Buildings
Keywords: Mechanical Joint Couplings/Combustible Material
Building Code Reference(s): 3.1.5.16.(1).; 3.1.5.2.(1).; 3.2.6.; Building Code Appeal
Board (BCAB) Decision #1098; BC Building Code Interpretation Committee (BCIC) Interpretation #06-0071
Question:
Are mechanical joint (MJ) couplings used in conjunction with cast iron soil pipes in noncombustible construction required to comply with Sentence 3.1.5.16.(1)?
Interpretation:
No,
Sentence 3.1.5.16.(1). regulates the use of combustible piping and tubing and associated adhesives. Cast iron pipe, including the MJ couplings used to join the pipe and fittings, have historically been classified as non-combustible material.
The limited amount of combustible material contained in an MJ coupling is acceptable under Sentence 3.1.5.2.(1). as a minor combustible component.
This Interpretation is consistent with BCAB Decision #1098 and BCIC Interpretation #06-0071.
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| 2012 |
12-0024 |
NAFFVA/Non-NAFFVA Appliance...file closed |
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| 2012 |
12-0025 |
Bicycle Storage Areas Opening Directly into Exits |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0025 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Bicycle storage areas opening directly into exits
Keywords: Bicycle storage, opening, exits
Building Code Reference(s): 3.3.5.4.(1), 3.3.5.7., 3.4.4.4.(8)
Question:
Can bicycle storage areas open directly into an exit?
Interpretation:
Yes, with exceptions
Sentence 3.4.4.4.(8) prohibits storage rooms, washrooms, toilet rooms, laundry rooms and similar ancillary rooms from opening directly into an exit.
If bicycle storage areas are used exclusively for storing bicycles, then they represent a fire risk that is considerably less than a "storage room", and are permitted to open directly into an exit.
If the bicycle storage area is located within an underground storage garage, then the requirements for vestibules between the storage garage and the exit would apply in accordance with Sentence 3.3.5.4.(1) and Article 3.3.5.7.
If the bicycle storage area is located within an enclosed room, and the room has opaque perimeter walls, there is a high possibility that this room could be used for purposes other than bicycle storage. It this case, the enclosed room would be considered to be a "storage room" and could not open directly into an exit.
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| 2012 |
12-0026 |
STC Rating...cancelled |
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| 2012 |
12-0027 |
NAFA & Exemption for Site Built Doors...referred to Victoria; Building Standards Branch |
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| 2012 |
12-0028 |
Fire Alarm Verification |
15/04/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0028 INTERPRETATION Page 1 of 1
Interpretation Date: April 15, 2014
Building Code Edition: BC Building Code 2012
Subject: Fire Alarm Verification
Keywords: Professional Schedules and CAN/ULC-S537
Building Code Reference(s): Sentence 3.2.4.5.(2)
Question:
Sentence 3.2.4.5.(2) requires fire alarm systems to be verified in conformance with CAN/ULC-S537 "Verification of Fire Alarm Systems" to ensure that they are operating satisfactorily.
Is the fire alarm system verification covered by the registered professional schedules 8-1, 8-2 & C-8 under electrical section 6.3 functional testing of electrical related fire emergency systems and devices?
Interpretation:
Yes.
The fire alarm system design and field review is covered by the registered professional's schedules.
CAN/ULC-S537 requires the verification to be conducted by qualified personnel other than the installing contractor or designer.
It is the responsibility of the registered professional to determine who is qualified to perform the fire alarm verification because the registered professional is taking responsibility for the fire alarm system.
The registered professional will request a copy of the fire alarm verification which shows that the fire alarm system is functioning properly before issuing a schedule C-8.
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| 2012 |
12-0029 |
Group B, Division 3, Care Occupancy |
21/04/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0029 INTERPRETATION Page 1 of 1
Interpretation Date: April 21, 2015
Building Code Edition: BC Building Code 2012
Subject: Group B, Division 3, Care Occupancy
Keywords: Care occupancy, residents' sleeping rooms, fire compartment, suites of care occupancy
Building Code Reference(s): 3.3.3.5.(1), 3.3.3.5.(2), 3.3.3.5.(9), 3.3.3.5.(11),
3.3.3.5.(15)
Question:
For a Group B, Division 3, care occupancy, is it necessary to separate the floor areas containing residents' suites of care occupancy into at least 2 fire compartments as required by Sentence 3.3.3.5.(2)?
Interpretation:
Yes
Floor area containing patients' or residents' sleeping rooms in a care or treatment occupancy where overnight sleeping accommodation is provided for more than a total of 10 patients or residents shall be divided into not less than 2 fire compartments, each not more than 1000 m2 in area as per Sentences 3.3.3.5.(1) and (2).
These residents' sleeping rooms are required to be separated from the remainder of the floor area by fire separations without a fire-resistance rating as per Sentence 3.3.3.5.(9) but this requirement does not apply to sleeping rooms within individual suites of care occupancy according to Sentence 3.3.3.5.(11) since individual suites are separated from the remainder of the floor area by fire separations with a fire-resistance rating as per Sentence 3.3.3.5.(15).
If a floor area containing suites of care occupancy with patients' or residents' sleeping rooms such floor area shall be divided into at least two fire compartments as per Sentence 3.3.3.5.(2). Sentence 3.3.3.5.(2) applies to all patients' or residents' sleeping rooms even if they are located within a suite.
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| 2012 |
12-0030 |
Travel Distance along Stair Flights or Ramps |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0030 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Travel distance along stair flights or ramps
Keywords: Travel distance, stairs, ramps
Building Code Reference(s): 3.4.2.4., 9.9.8.1.
Question:
Should the travel distance along a flight of stairs or a ramp be measured as the horizontal dimension in plan view?
Interpretation:
No
The travel distance along a flight of stairs or a ramp must be measured along the slope of the stair or ramp to replicate the actual distance that is traveled to reach an exit.
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| 2012 |
12-0031 |
Central Alarm Control Facility |
27/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0031 INTERPRETATION Page 1 of 2
Interpretation Date: January 27, 2015
Building Code Edition: BC Building Code 2012
Subject: Central Alarm Control Facility
Keywords: Central Alarm Control Facility, auxiliary equipment, manual controls
Building Code Reference(s): 3.2.6.2 .(2), 3.2.6.2.(4), 3.2.6.2.(5), 3.2.6.3., 3.2.6.6.,
3.2.6.7.(2)(i)
Question:
Subclause 3.2.6.7.(2)(i)(i) requires that the central alarm and control facility (CACF) shall include means, as appropriate to the measure for fire safety provided in the building, to actuate auxiliary equipment.
1. What is considered auxiliary equipment?
2. Are all stair pressurization equipment in a high building, including ones that activate automatically, required to be provided with a control device at the CACF for manual operation (such as ON/OFF override switch)?
Interpretation:
1. Appendix B-3.2.6.7.(2) states that "depending on the method of mechanical venting and air control that is selected for the building, additional controls may be required at the CACF. These additional controls .i nclude those with a capability of opening closures to vents in shafts, stopping air-handling systems, and initiating mechanical air supply to stair shafts.
Sentence 3.2.6.2.(4) requires that measures shall be taken to limit movement of smoke from a fire in a floor area below the lowest exit storey into upper storeys. Further clarification in
Appendix B-3.2.6.2.(4)(3)(c) requires that any closure provided for a vent opening for vertical shafts referred to in Sentence (2) must be openable by a control device located at the CACF.
addition to the manual switches for the required smoke control system Sentence 3.2.6.2.(5) also requires manually operated switches at the CACF for all air moving fans in a system that serves more than 2 storeys except exhaust fans in kitchens, washrooms and bathrooms in dwelling units and except for fans used for smoke venting to aid firefighting.
Currently there is a proposed code change to Clause 3.2.6.7.(2)(i) in 2015 NBC to clarify the intent of the code and refer to auxiliary equipment that manages smoke movement in high buildings in Articles 3.2.6.2., 3.2.6.3. and 3.2.6.6.
It is interpreted that the auxiliary equipment specified in Subclause 3.2.6.7.(2)(i)(i) are all smoke control systems as required by Articles 3.2.6.2., 3.2.6.3. and 3.2.6.6 .
2. Subclause 3.2.6.7.(2)(i)(i) only requires means to actuate auxiliary equipment but it does not specify if the actuation should be manual or automatic. Smoke control systems that are activated automatically deem to meet the intent of Subclause 3.2.6.7.(2)(i)(i). Local Fire Department should be consult regarding means of actuation of auxiliary equipment.
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| 2012 |
12-0032 |
Noncombustible Building: Combustible Exit Stair Treads Finish Floorinq |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0032 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014 (Updated March 17, 2015)
Building Code Edition: BC Building Code 2012
Subject: Noncombustible Building: Combustible Exit Stair Treads Finish Floorinq
Keywords: Flame-spread rating, combustible flooring in exits
Building Code Reference(s): 3.1.5.8.(4), 3.1.13.2., 3.1.13.7., 3.1.13.8.(1)(b)
Question:
Is it permitted to have noncombustible exit stair treads with combustible finish flooring in a building that is sprinklered throuqhout and that is required to be of noncombustible construction?
Interpretation:
Yes (with conditions)
Noncombustible stair treads with combustible finished flooring are permitted in a noncombustible building that is sprinklered throughout, provided that the building is not classified as a high building that contains a Group B major occupancy.
Sentence 3.1.5.8.(4) permits combustible finished flooring in a building required to be of noncombustible construction. "
Sentence 3.1.13.2.(1) and Table 3.1.13.2. restricts the flame-spread rating to a maximum of 25 for wall and ceiling surfaces within an exit, regardless of the building being sprinklered or unsprinklered. Sentence 3.1.13.2.(1) and Table 3.1.13.2. does not limit the flame-spread rating of floor finishes within exits. "
Clause 3.1.13.8.(1)(b) requires that the flame-spread rating for wall and ceiling finishes within exits maintain the maximum 25 flame-spread rating when the surface finish is cut in any direction with a knife. Again this requirement does not apply to floor finishes within exits.
Sentence 3.1.13.7.(1) and Table 3.1.13.7. have additional requirements for flame-spread ratings and smoke development classifications for high buildings, including floor finishes, although Sentence 3.1.13.7.(2) waives these requirements when the building is sprinklered. This waiver does not apply to high buildings that contain a Group B major occupancy or for elevator cars within a high building.
Although the 2012 BCBC requires all high buildings to be sprinklered, there are many existing high buildings that are unsprinklered. Existing unsprinklered high buildings would be subject to the additional requirements of Sentence 3.1.13.7.(1) and Table 3.1.13.7., so noncombustible stair treads with combustible finished flooring would not be permitted in such buildings.
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| 2012 |
12-0033 |
Travel Distance when Corridors Contain Occupancies |
17/06/2014 |
MBC,APEGBC,BOABC,POABC
File No: 12-0033 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Travel distance when corridors contain occupancies
Keywords: Occupancies in corridors, travel distance
Building Code Reference(s): 3.3.1.9.(2) & (5), 3.4.2.4.(2)
Question:
If a room opens onto a corridor that is used by the public, and the corridor contains an occupancy, can the travel distance from the room to the nearest exit be measured from the room egress door?
Interpretation:
Yes, with conditions
Sentence 3.4.2.4.(2) permits travel distance to be measured from an egress door of room with the following conditions:
(a)(i) If the building is not sprinklered throughout - the room must be separated from the remainder of the floor area with a fire separation having a¾ hour fire resistance rating.
(a)(ii) If the building is sprinklered throughout- the room must be separated from the remainder of the floor area with a fire separation with no fire resistance rating.
(b)(ii) The corridor used by the public must be separated from the remainder of the floor area in conformance with the requirements in Article 3.3.1.4. for the separation of public corridors.
The presence of an occupancy within the corridor does not affect the provisions of Sentence
3.4.2.4.(2).
Note that minimum corridor widths described in Sentences 3.3.1.9.(2) & (5) must be maintained.
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| 2012 |
12-0034 |
Travel Distance when Corridors are within an Interconnected Floor Space |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0034 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014 (revised April 17, 2015)
Building Code Edition: BC Building Code 2012
Subject: Travel distance when corridors are within an interconnected floor space
Keywords: Corridors used by the public, travel interconnected floor space distance,
Building Code Reference(s): 3.3.1.9.(2) & (5), 3.4.2.4.(2)
Question:
If a room opens onto a corridor that is used by the public, and the corridor is located in a building that contains an interconnected floor space conforming to Subsection 3.2.8., can the travel distance from the room to the nearest exit be measured from the room egress door?
Interpretation:
Yes, with conditions
Sentence 3.4.2.4.(2) permits travel distance to be measured from an egress door of room with the following conditions:
(a)(i) If the building is not sprinklered throughout - the room must be separated from the remainder of the floor area with a fire separation having a¾ hour fire resistance rating.
(a)(ii) If the building is sprinklered throughout - the room must be separated from the remainder of the floor area with a fire separation with no fire resistance rating.
(b)(ii) The corridor used by the public must be separated from the remainder of the floor area in conformance with the requirements in Article 3.3.1.4. for the separation of public corridors.
The fact that the corridor is located in a building that contains an interconnected floor space does not affect the provisions of Sentence 3.4.2.4.(2), provided that the corridor is separated from the remainder of the floor area in accordance with Sub clause 3.4.2.4.(2){b)(ii) and Article 3.3.1.4.
Note that minimum corridor widths described in Sentences 3.3.1.9.(2) & (5) must be maintained.
Note also that if Sentence 3.3.1.4.(4) is used to waive the fire separation between the room and the corridor, travel distance must be measured to "any part of the floor area" (i.e. within the room).
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| 2012 |
12-0035 |
Braced Wall Panels Exemptions |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0035 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Braced Wall Panels Exemptions
Keywords: Braced wall panel, braced wall band, roof framing
Building Code Reference(s): 9.23.13.5.(3)
Question:
Sentence 9.23.13.5.(3) exempts porch with roof framing members spacing at 400 mm o.c. Does this exemption apply to porch with roof trusses at 400 mm. o.c.?
Interpretation:
YES
Sentence 9.23.13.5.(3) exempts the braced wall panels for a single storey space where the roof of the space projects not more than 3.5 m from the nearest braced wall band and not more than half of the perpendicular dimension.
The roof of such space is integral with the roof or the wall of the rest of the building with framing members not more than 400 mm o.c.
With the absent of the braced wall panels the roof is acting like a braced wall transferring the shear forces to the roof or the wall of the building. The limitation of this exemption is for roof members spacing not more than 400 mm. o.c. Roof framing members spacing at 600 mm
o.c. would have lower shear capacity.
It is interpreted that this exemption also applies to roof framing with trusses spacing not more than 400 mm. o.c.
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| 2012 |
12-0036 |
Silencing of Interconnected Smoke Alarms |
27/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0036 INTERPRETATION Page 1 of 2
Interpretation Date: January 27, 2015
Building Code Edition: BC Building Code 2012
Subject: Silencing of Interconnected Smoke Alarms
Keywords: Interconnected smoke alarm, silencing, dwelling unit, secondary suite
Building Code Reference(s): 9.10.19.1., 9.10.19.5, 9.10.19.6.(1), 9.37.2.19
Question:
All smoke alarms within a dwelling unit are required to be interconnected and each of the smoke alarm shall have an automatic resettable silencing feature (hush button).
1. When the silencing button of the activated smoke alarm is pressed, is it required to silence all the smoke alarms on that interconnection?
2. Can the alarm be silenced from any one of interconnected smoke alarms?
3. Should the interconnected photoelectric smoke alarms as required by Article 9.37.2.19 between the principal dwelling and the secondary suite be silenced from any one of the two?
Interpretation:
1. Yes.
Sentence 9.10.19.1.(1) requires that smoke alarms conforming to CAN/ULC-S531 shall be installed in a dwelling unit.
Sentence 9.10.19.5.(1) requires all the smoke alarms within a dwelling unit be interconnected so that the activation of one alarm will cause all alarms within the dwelling unit to sound.
Sentence 9.10.19.6.(1) requires each interconnected smoke alarm to have manually operated device (hush button) to silence the signal emitted by the smoke alarm for a period of not more than 10 minutes and after which the smoke alarm will reset and sound again if the level of smoke in the vicinity is sufficient to re-actuate it.
f the smoke continues to build from a real fire while the alarm is in hush mode, the smoke will override the silence feature and the smoke alarm will resound. This is a convenient way to deal with nuisance alarms, such as those caused by burning toast or opening smoky ovens, and avoid having to disabling the alarm by disconnecting the power source.
There is no language in the code to address the silencing of all the smoke alarms on that interconnection; however, the intent is to be able to silence all the smoke alarms on the same interconnection if the hush button of the activated smoke alarm is pressed.
Generally the green LED on the smoke alarm is on constantly on standby mode. When a smoke alarm is activated by smoke the green LED will flash red and it sends a 9 volt signal to activate the alarm on all the interconnected smoke alarms. The remaining interconnected smoke alarms will sound but the green LED would not turn red.
When the hush button is pressed on the activated smoke alarm the flashing red LED will turn green. The hush feature has the capability of temporarily desensitizing the smoke alarm circuit and the green LED will flash for about 10 minutes. It will silence the rest of the interconnected smoke alarms. When the unit returns to normal operation after being in hush mode, it will sound the alarm again if smoke is still present.
2. No.
If the smoke alarm in the basement is activated by smoke pressing the hush button of the non-initiated smoke alarms on the interconnection (say at the top storey) would not silence all the alarms. This will prevent the occupants on the other floors away from the fire origin to silence the entire alarm system without knowing the fire situation.
3. No.
The above interpretations should apply to the two interconnected photoelectric smoke alarms in the principal dwelling and in the secondary suite as required by Article 9.37.2.19. If the photoelectric smoke alarm in the principal dwelling is activated the other photoelectric smoke alarm in the secondary suite will also sound. Pushing the hush button on the activated alarm located in the principal dwelling should silence both alarms. Pushing the hush button on the alarm in the secondary suite should not be able to silence both alarms since the occupants in the secondary suite would not know the fire condition in the principal dwelling. |
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| 2012 |
12-0037 |
Unsprinklered Electrical Room in an Interstitial Service Space not Considered a Storey |
17/06/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0037 INTERPRETATION Page 1 of 1
Interpretation Date: June 17, 2014
Building Code Edition: BC Building Code 2012
Subject: Unsprinklered electrical room in an interstitial service space not considered a storey
Keywords: Unsprinklered electrical room, interstitial service space
Building Code Reference(s): 3.2.1.1.(8), 3.2.5.12.(1), NFPA 13 - 8.15.10.3
Question:
Service spaces permitting entry for the purposes of maintenance and other operations relating to building services, are permitted to not be considered a storey if such space conforms to a series of fire and life safety measures, which also includes those covered by Article 3.2.5.14. This Article requires automatic sprinkler protection if the floor is other than catwalks. Can the provisions of
NFPA 13 - 8.15.10.3 be then used to waive the automatic sprinklers inside an electrical room occupying partially or wholly the interstitial service space?
Interpretation:
Yes.
Interstitial service spaces designed to 3.2.1.1.(8) are required to be sprinklered to 3.2.5.12.(1), 3.2.5.14, and NFPA 13.
However NFPA 13- 8.15.10.3 allows sprinklers to be omitted from electrical equipment rooms subject to certain conditions:
"8.15.10.3 Sprinklers shall not be required in electrical equipment rooms where all of the following conditions are met:
(1) The room is dedicated to electrical equipment only.
(2) Only dry-type electrical equipment is used.
(3) Equipment is installed in a 2-hour fire-rated enclosure including protection for penetrations.
(4) No combustible storage is permitted to be stored in the room."
If all the above protection conditions are met, compliance with NFPA 13 would be achieved and the space would be deemed to be protected under NFPA 13. Note that this approach differs however, for example from that in Sentence 3.2.5.12.(6) for rooms or spaces immediately below a roof, where sprinklers are required notwithstanding any exemptions in the referenced sprinkler standards. |
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| 2012 |
12-0038 |
Elevator Car Minimum Inside Dimensions |
21/04/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0038 INTERPRETATION Page 1 of 2
Interpretation Date: April 21, 2015
Building Code Edition: BC Building Code 2012
Subject: Elevator car minimum inside dimensions
Keywords: Elevator car, minimum stretcher inside dimensions, patient
Building Code Reference(s): 3.8.3.10, 3.5A.1.(1)
Question:
Article 3.8.3.10 provides 4 different options for connecting floors or levels at different elevations, to facilitate access for persons with disabilities. Limited-Use / Limited-Application (LULA) elevators are one such available option under Clauses 3.8.3.10.(1)(b) & (d), and are designed and constructed to ASME A17.1/CSA-844, "Safety Code for Elevators and Escalators"; but these do not fall under CAN/CSA-8355 "Lifts for Persons with Physical Disabilities" referenced in Clause 3.8.3.10.(1)(c). The LULA elevator is also acceptable under Clause 3.8.3.10.(1)(d) as another means acceptable to the authority having jurisdiction.
If a LULA classified elevator is the only elevator provided for a storey, must such an elevator also comply with Sentence 3.5.4.1.(1), which requires elevator car minimum inside dimensions to accommodate a patient stretcher in the prone position?
Interpretation:
Yes; however further consideration is warranted for some situations as discussed below.
The Elevating Devices Safety Regulation under the ASME A17.1/CSA-844 standard Section 5.2 allows an elevator classified as a Limited-Use/ Limited-Application (LULA) elevator to be used in buildings to facilitate access for persons with disabilities to different floor levels, consistent with Clauses 3.8.3.10.(1)(b) & (d). Sentence 3.5.4.1.(1) provides as an acceptable solution that if 1 or more elevators are provided in a building, all storeys must be served by at least 1 elevator that has inside dimensions that will accommodate and provide adequate access for a patient stretcher 2010 x 610mm held in the prone position. However a LULA elevator does not have the space requirements required under Sentence 3.5.4.1.(1) to accommodate a stretcher in the prone position.
For smaller buildings or storeys and limited vertical rise conditions, designers have the option of choosing to specify a lift conforming to CAN/CSA-8355 "Lifts for Persons with Physical Disabilities". These would not be considered an "elevator" and would not be subject to Sentence 3.5.4.1.(1).
However designers often consider using LULA elevators as a superior option to this. These elevators are designed and constructed to ASME A17.1/CSA-B44, "Safety Code for Elevators and Escalators" and not to CAN/CSA-B355 "Lifts for Persons with Physical Disabilities", but have similarities with lifts under the latter standard. A LULA elevator is defined in ASME A17.1/CSA-B44 Section 1.3 as "a power passenger elevator in which the use and application is limited by size, capacity, speed, and rise", and limited by reference 5.2.1.16 to max 635kg capacity and 1.67m2 area (typical dimensions are
1292 x 1292mm or 1065 x 1568mm); maximum vertical travel is 7.6m.
fa.. LULA elevator is substantially similar to an enclosed platform lift conforming to CAN/CSA-B355, and is required by E-19 to meet E-1, and E-3 to E-17 of ASME A17.1/CSA-B44 Nonmandatory Appendix E "Elevator Requirements for Persons with Physical Disabilities in Jurisdictions Enforcing NBCC".
For smaller buildings and storeys, provided the vertical travel of the LULA elevator is limited to a maximum vertical travel of 7m, and if such an elevating device would be used specifically to facilitate access for persons with disabilities, sufficiently similar to a lift under CAN/CSA-B355; such an elevator could be considered to not require the dimensional clearances in Sentence 3:5.4.1.(1). Although the LULA device is defined as an elevator, it essentially functions as a lift for accommodating persons with disabilities, with a limited vertical rise.
Support for this approach is provided by Alberta's Standard Building Code Interpretation
06-BCl-028 of February 2010, and discussions with the BC Building and Safety Standards Branch. A proposed code change to clearly exempt LULA elevators from Sentence 3.5.4.1.(1) has been submitted to NRCC for consideration in the next edition of NBCC.
Where multiple elevators are provided for a building or storey, at least one of the elevators must conform to Sentence 3.5.4.1.(1), which requires elevator car minimum inside dimensions to accommodate a patient stretcher in the prone position. |
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| 2012 |
12-0039 |
Clearance Beside a Door Latch of a Toilet Compartment |
17/02/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0039 INTERPRETATION Page 1 of 1
Interpretation Date: February 17, 2015
Building Code Edition: BC Building Code 2012
Subject: Clearance beside a door latch of a toilet compartment
Keywords: Door clearance, disability, accessibility, toilet compartment
Building Code Reference(s): 3.3.1.13.(10)(b); 3.7.2.10.(2)
Question:
Does the door to an accessible toilet compartment as per Sentence 3.7.2.10.(2) need to conform to Clause 3.3.1.13.(10)(b) and maintain clearances of 300 mm and 600 mm beside the door latch?
Interpretation:
No.
The toilet compartment door and hardware requirements specified in Sentence 3.7.2.10.(2) allow wheelchair access to control the door opening, closing and latching by specifying the location and a type of the pull handles, see Clauses 3.7.2.10.(2)(d, e & f).
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| 2012 |
12-0040 |
Spatial Separation for C-shaped Buildings |
16/09/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0040 INTERPRETATION Page 1 of 1
Interpretation Date: September 16, 2014
Building Code Edition: BC Building Code 2012
Subject: Spatial separation for C-shaped buildings
Keywords: Spatial separation, limiting distance, C-shaped buildings
Building Code Reference(s): Div A - 1.4.1.2.(1) (def'n of limiting distance), 3.2.3.14.
Question:
This project is a C-shaped building that is divided into separate fire compartments. Are 2 separate fire compartments that face one another in this C-shaped building subject to spatial separation requirements of Subsection 3.2.3.
Interpretation:
Yes, with exceptions
The exposing building faces of 2 separate fire compartments that are located within the same building are subject to the requirements of Article 3.2.3.14.
If the building is not sprinklered throughout, spatial separation requirements described in Sentences 3.2.3.14.(1) & (2) apply, and the distance "Do" is measured between the exterior building faces of the 2 separate fire compartments as shown in Figure A-3.2.3.14.(1)-8 of Division B - Appendix A.
If the building is sprinklered throughout, Sentence 3.2.3.14.(3) permits unlimited unprotected openings in the exposing building faces in both fire compartments that face one another.
The requirements of Article 3.2.3.1. do not apply to the exposing building faces of 2 separate fire compartments that are located within the same building.
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| 2012 |
12-0041 |
Fire Separation of Service Room Containing Life Safety Equipment |
16/09/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0041 INTERPRETATION Page 1 of 2
Interpretation Date: September 16, 2014
Building Code Edition: BC Building Code 2012
Subject: Fire Separation of Service Room containing life safety equipment·
Keywords: Fire separation, service room
Building Code Reference(s): 3.2.4.11.(2)(b), 3.6.2.1.(1) to (8)
Question:
If service equipment, such as sprinkler valves and fire alarm components, are located in a service room within a floor area that is sprinklered throughout, is a fire separation required for such a service room?
Interpretation:
No·
Sentences 3.6.2.1.(1) to (6) determine when a service room is required, and when the perimeter walls of a service room require a fire separation based on the hazard presented by the equipment located within the service room. The requirements in these sentences apply to both sprinklered and unsprinklered floor areas.
Sentence 3.6.2.1.(7) states that in a storey that is not sprinklered throughout, a fire separation with a 1 hour fire resistance rating is required around a service room containing equipment other than that addressed in Sentences (1) to (6); however, Sentence 3.6.2.1.(8) waives the requirement for such a fire separation if the service room contains a limited qua,ntity of service equipment, and the service equipment neither constitutes a fire hazard nor is essential tb the operation of fire safety systems in the building. Both sentences only apply to service rooms in a storey that is not sprinklered throughout.
In a storey that is sprinklered throughout, a service room containing equipment essential to the operation of fire safety systems in the building, and such equipment is not _listed in Sentences (1) to (6), no fire separation is required. If the fire safety equipment is listed in Sentences (1) to (6), such as a diesel emergency power generator or dialectric liquid-filled electrical equipment, a 1 hour fire separation is required.
It is concluded that in a floor area that is sprinklered throughout, the perimeter walls of a service room containing service equipment such as sprinkler valves and fire alarm components, need not be constructed as fire separations.
If an electrical room is unsprinklered as permitted by NFPA 13, the following provisions are required:
• The room is dedicated to electrical equipment only,
• Only dry-type electrical equipment is used,
• Equipment is installed in a 2-hour fire-rated enclosure including protection of penetrations, and
• No combustible storage is permitted to be stored in the room.
If such electrical room is unsprinklered, Clause 3.2.4.11.(2)(b) would require a fire detector within such room. This is commonly achieved with a smoke detector with separate annunciation at the fire alarm annunciator panel.
Note -this is an update to Interpretation 06-0043 to specifically address unsprinklered electrical rooms.
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| 2012 |
12-0042 |
Residential Mezzanine at the Top Storey |
16/09/2014 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0042 INTERPRETATION Page 1 of 1
Interpretation Date: September 16, 2014
Building Code Edition: BC Building Code 2012
Subject: Residential Mezzanine at the Top Storey
Keywords: Top storey, mezzanine, building height, high building
Building Code Reference(s): 3.2.6.1.(1)(d)
Question:
If the top storey of a residential building contains a mezzanine, and the height of the top storey is less than 18m above grade, but the height of the mezzanine is more than 18m above grade, is the bufldit1@ considered to be a high building?
Interpretation:
Yes
Clause 3.2.6.1.(1)(d) clearly states that if a building contains a Group C major occupancy whose floor level is more than 18m above grade, such a building must be considered to be a high building.
Although the mezzanine may not be considered to be a "storey", it is still considered to be a "floor level" for the purposes of Clause 3.2.6.1.(1)(d).
This interpretation is consistent with the 2012 BCBC Errata for 6 storey combustible residential buildings Clause 3.2.2.50.(1)(c) which reads:
"c) it has a maximum height of less than 18 m measured between grade and the uppermost floor level of the top storey''.
The uppermost floor level of the top storey would be the mezzanine.
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| 2012 |
12-0043 |
Limits for Exterior Openings for Dwelling Units with Secondary Suites |
16/09/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0043 INTERPRETATION Page 1 of 2
Interpretation Date: September 16, 2015
Building Code Edition: BC Building Code 2012 (after December 19, 2014)
Subject: Limits for exterior openings for dwelling units with secondary suites
Keywords: Windows, unprotected openings, limiting distance, dwelling units, secondary suites
Building Code Reference(s): 9.37.2.18.(2)(b), 9.10.14.4.(3), 9.10.15.4.(3), 9.10.14.2,
9.10.15.2
Question:
An unsprinklered dwelling unit which includes a secondary suite has a limiting distance to side property lines of over 1.2m, but less than 2m.
1. Which Subsection applies: 9.10.14, or 9.10.15?
2. Based on Clause 9.37.2.18.(2)(b), Sentence 9.10.14.4.(3) applies. Are the limits for individual unprotected openings applied in all cases of an exterior wall with varying limiting distances along its face, even if some of them are located over 2m away from the property line?
3. Are the limits in Sentence 9.10.14.4.(3) applied to both sides of the dwelling unit even if the secondary suite is located horizontally only on one side of the dwelling unit?
4. Are these restrictions applied even to existing dwelling units being renovated to accommodate a secondary suite?
5. Are the limits in Sentence 9.10.14.4.(3) applied even to an exterior door?
Interpretation:
1. Subsection 9.10.15 should apply.
It is recognized that it is intended that the spatial separation exposure protection approach for dwelling units with secondary suites should not be any different from that for individual dwelling units. It is expected that this will be better clarified in the next edition of the Building Code. Refer also to previous BC Building Policy Branch Bulletin No, B07-04 "Spatial Separation for Buildings Incorporating a Secondary Suite", copy attached. It is noted the NBCC 2010 explicitly includes a dwelling unit with a secondary suite in the scope of subsection 9.10.15.
Note that per the definition of a secondary suite, Section 9.37 applies only to a building of residential occupancy having only one other dwelling unit. ·
2. It is recognized that it is intended that the spatial separation exposure protection approach for dwelling units with secondary suites should not be any different from that for individual dwelling units. In this case the more appropriate reference should actually be 9.10.15.4.(3), and the Subsection 9.10.15 approach allowing separate portions of the exposing building face to be used for the purposes of separately determining percentages of openings permitted, would be appropriate. It is expected that this will be better clarified in the next edition of the Building Code. Refer also to previous BC Building Policy Branch explanatory bulletin No. B07-04 "Spatial Separation for Buildings Incorporating a Secondary Suite", copy attached.
3. Yes.
Currently there is no distinction made in the Building Code as to which side of the building the secondary suite is located, for spatial separation or exposure protection purposes. In this case the more appropriate reference should actually-be 9.10.15.4.(3).
4. Yes.
There is no distinction made between new or existing buildings in Section 9.37.
5. No.
It is recognized that it is intended that the spatial separation exposure protection approach for dwelling units with secondary suites should not be any different from that for individual dwelling units. The more appropriate reference should be 9.10.15.4.(3). This sentence addresses "glazed openings" as opposed to "unprotected openings". It is expected that this will be better clarified in the next edition of the Building Code.
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| 2012 |
12-0044 |
Water Pipe Sizing |
27/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0044 INTERPRETATION Page 1 of 2
Interpretation Date: Jan 27, 2015
Building Code Edition: BC Plumbing Code 2012
Subject: Water Pipe Sizing
Keywords: Velocities , Water Pipe Sizing
Building Code Reference(s): Tables A-2.6.3.1.(2)A&F & 2.6.3.4.
Question:
1. Considering the maximum fixture units permitted for various water velocities indicated in Table
2.6.3.4 would this apply to all types of water piping material regardless of the variation with internal diameter?
2. Do the hydraulic fixture unit loads shown in Table A-2.6.3.1.(2)A (Small Commercial Method) and A-2.6.3.1.(2)F (Average Pressure Loss Method) apply to the nominal pipe size of all types of water piping regardless of the actual internal diameter of the pipe and fittings?
Interpretation:
1. No
Table 2.6.3.4.was created to show the fixture units permitted for the velocities shown in each column using the internal diameter of copper tubing and other piping using iron pipe size internal dimensions which is consistent with most published engineering data including ASPE Data Books. One very important component in adequate water pipe sizing is the internal diameter of the chosen piping as it controls the actual velocity and ensures the system can supply water to the most remote water outlet. For example, where a pipe manufacturer indicates an acceptable maximum velocity for a product it must be the actual velocity based on the internal diameter being equal to or greater than the minimum internal dimensions used to create Table 2.6.3.4.velocity columns. The total fixture unit values indicated in each velocity column should be adjusted by a percentage amount that is equal to the actual variation with the internal diameter of the iron pipe dimensions used in Table 2.6.3.4.
Therefore, the existing Table 2.6.3.4. for buildings containing one or two Dwelling Units and Row houses with separate Water Services should be used for copper tube, and PVC-Schedule 40 for cold water supply only, and other piping whose SOR dimensions are based on the O.D. of Iron Pipe.
See the POABC Website for a Bulletin including tables that reflect the adjusted Total Fixture Units permitted for piping systems whose internal dimensions vary from copper tube or iron pipe.
2. No
The Appendix contains the Small Commercial Method, the Average Pressure Loss Method and the One/Two Family Dwelling Method which provide simplified methods for the noted building types. The total fixture unit capacities indicated in Tables A-2.6.3.1.(2)A and Table 'A-2.6.3.1.(2)F were created using the same engineering data as Table 2.6.3.4.that includes iron pipe O.D. dimensions to determine the minimum internal pipe diameters.
The Small Commercial Method uses the existing Table A-2.6.3.1. (2)A that indicates total permitted fixture units based on actual velocities and pressures available to supply water to the most remote outlet. This table should only be used for copper tube or PVC-Schedule 40 for cold water only and other pipe material with internal diameters that are equal to or larger than Type L copper or iron pipe size.
The Average Pressure Loss Method uses Figure A-2.6.3.1.(2)A to establish the minimum pressure required for friction loss based on the total developed length of the installation, the adjusted pressure available at the entry of the water service and the actual velocity of the chosen pipe material. As noted in the other methods it is again very important for the internal diameter to be equal to or greater than the iron pipe dimensions because where the internal diameter is less than the iron pipe dimensions the system would not be able to provide adequate water supply to the most remote fixture supply pipe. The existing Table A-2.6.3.1.(2)F should be used only for Type L copper tube, or PVC-Schedule 40 for cold water only, and other pipe material whose SOR dimensions are based on the O.D. dimensions of iron pipe
In order to ensure proper pipe sizing the permitted maximum fixture units that apply to each of the velocity columns must have the actual iron pipe minimum internal dimensions or have the maximum permitted fixture units adjusted by a percentage amount that is equal to the actual variation with the internal diameter of the iron pipe/copper tube used in all of the pipe sizing tables.
Care must be taken to ensure the adjusted Fixture Unit Values are in accordance with the good engineering practice published in ASHRAE Handbooks and ASPE Data Books.
See the POABC Website for a Bulletin including tables that reflect the adjusted Total Fixture Units permitted for piping systems whose internal dimensions vary from copper tube and iron pipe.
An alternate to any of these quick methods for smaller buildings would be to use a Detailed Engineering Design Method although it would likely arrive at the same pipe size conclusion. |
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| 2012 |
12-0045 |
Washroom Counts for Exterior Ancillary Spaces |
27/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0045 INTERPRETATION Page 1 of 1
Interpretation Date: January 27, 2015
Building Code Edition: BC Building Code 2012
Subject: Washroom counts for exterior ancillary spaces
Keywords: Washroom counts, exterior occupancies ancillary spaces, assembly
Building Code Reference(s): 3.1.17.1., 3.7.2.2.
Question:
Washroom counts are determined based on estimated occupant load which is typically derived from floor area size, as set out in Article 3.1.17.1. "Floor area" is a defined term and is typically assumed to refer to interior spaces bounded by exterior walls.
Do the requirements for washroom fixtures apply to exterior ancillary spaces such as exterior patios and roof decks?
Interpretation:
Yes.
Occupant load is determined from Sentences 3.1.17.1.(1) & (2). Sentence 3.1.17.1.(3) indicates that balconies are regarded as part of the floor area for the purposes of Article 3.1.17.1. Similarly exterior ancillary spaces if occupied should be con idered as part of the interior floor area for the purposes of Articles 3.1.17.1 and 3.7.2.2.
However if it can be satisfactorily demonstrated that fewer persons will actually occupy simultaneously both interior and exterior spaces combined, then this would be consistent with Clause 3.1.17.1.(1)(c).
Seating in an exterior space is typically seasonal; discussion and agreement with the Authority having Jurisdiction may be warranted.
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| 2012 |
12-0046 |
Water Closet Calculations |
17/02/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0046 INTERPRETATION Page 1 of 1
Interpretation Date: February 17, 2015
Building Code Edition: BC Building Code 2012
Subject: Water closet calculations
Keywords: Water closets
Building Code Reference(s): 3.7.2.2.; Table 3.7.2.2.A; 3.7.2.2.(7)
Question:
1. Clarify the wording in Table 3.7.2.2.A (Assembly) for the over 400 persons in each sex 7, plus 1 for each additional increment of 200 males in excess of 400.
2. Clarify the wording in Sentence 3.7.2.2.(7) (Daycare and Primary Schools) "... at least one for
each 30 males... ".
NUMBER OF MALE WATER CLOSETS NUMBER OF FEMALE WATER CLOSETS
1. 351-400 6 water closets 351-400 12 water closets
401-600 7 water closets 401-500 13 water closets
501-600 14 water closets
601-800 8 water closets 601-700 15 water closets
701-800 16 water closets
etc. etc.
2. 1-30 1 water closet 1-25 1 water closet
31-60 2 water closets 26-50 2 water closets
61-90 3 water closets 51-75 3 water closets
etc. 76-100 4 water closets
etc.
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| 2012 |
12-0047 |
Roof Deck above a 3 Storey Townhouse Suite |
17/03/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0047 INTERPRETATION Page 1 of 1
Interpretation Date: March 17, 2015
Building Code Edition: BC Building Code 2012
Subject: Roof deck above a 3 storey townhouse suite
Keywords: Roof deck, townhouse, storey, single exit
Building Code Reference(s): 3.3.4.4., 9.9.9.1.(3), 9.10.4.4.
Question:
This Part 9 building contains 3 storey non-stacked townhouse suites (i.e. no dwelling unit above or below another suite) that is served by a single exterior exit door at the 1st storey.
1. Is it permissible to have an occupied roof deck on the 4th level?
2. Is it permissible to have an internal stair that leads to this roof deck where the stair has a landing at the 4th level and has a rooftop enclosure at the 4th level?
3. Is it permissible to have screens and open trellises on the 4th level roof deck?
Interpretation:
1. Yes
Sentence 9.9.9.1.(3) permits the travel distance to a single exterior exit door at the 1st storey to exceed 1 storey when the floor level has direct access to a balcony. The 4th level roof deck would be considered as a "balcony" for the purposes of Sentence 9.9.9.1.(3).
2. Yes
Although the wording of Sentence 9.10.4.4.(1) is somewhat ambiguous, the intent statements of both Sentences 3.2.1.1.(1) and 9.10.4.4.(1) are identical. It is interpreted that the intent of Sentence 9.10.4.4.(1) is to permit a rooftop enclosure for an internal access stairway to the roof deck without considering the rooftop enclosure as a storey in calculating the building height. Both the rooftop enclosure and the roof deck would not be considered as a storey, so the building would be classified as 3 storeys in building height as required for a Part 9 building.
Note -the BC Building Code Interpretation Committee has submitted a proposed code change to NRC to revise the wording of Sentence 9.10.4.4.(1) to match that of Sentence 3.2.1.1.(1).
3. Yes
Screens and open trellises would not result in the roof deck to be considered as a storey.
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| 2012 |
12-0048 |
Minimum Size of Fixture Outlet Pipe for Laundry Tray |
27/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0048 INTERPRETATION Page 1 of 1
Interpretation Date: January 27, 2015
Building Code Edition: BC Plumbing Code 2012
Subject: Minimum Size of Fixture Outlet Pipe for Laundry Tray
Keywords: Laundry Tray, Clothes Washer, Fixture Outlet Pipe, Trap
Building Code Reference(s): Table 2.4.9.3., 2.4.9.3.(3), Appendix A-2.4.9.3.(3)
Question:
What is the minimum size of the fixture outlet pipe and trap serving a laundry tray that receives the discharge from a clothes washer?
Interpretation:
A laundry tray that receives the discharge from a domestic clothes washer is permitted a minimum 1½" fixture outlet pipe and trap.
Table 2.4.9.3 provides the minimum permitted size of a fixture outlet pipe for various fixtures. A laundry tray is permitted a minimum fixture outlet pipe of 1½". Additionally, the Table provides a footnote, (1), in relation to a domestic clothes washer directing the user to Appendix A.
Appendix A-Table 2.4.9.3. states, "When determining the hydraulic load on a pipe, no allowance need be made for a load from a domestic clothes washer when discharged to a laundry tray since the hydraulic load from the laundry tray is sufficient".
Further requirements for clothes washer standpipe installations are contained in Sentence 2.4.9.3.(3) which indicate that a difference exists when a clothes washer is drained to a laundry tray as opposed to having an individual connection point. The volume of liquid retention inherent to a laundry tray is clearly a factor to consider.
It is also important to ensure that the clothes washer standpipe minimum length of 600 mm is maintained as illustrated in Appendix A-2.4.9.3.(3).
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| 2012 |
12-0049 |
Materials in Air Duct and Plenum Systems |
21/04/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0049 INTERPRETATION Page 1 of 1
Interpretation Date: April 21, 2015
Building Code Edition: BC Building Code 2012
Subject: Materials in Air Duct and Plenum Systems
Keywords: Air duct systems, plenums, flame spread cavity, I-joist rating, joist
Building Code Reference(s): 9.33.6.1.(1), 9.33.6.2.(2), 9.33.6.4.(2)
Question:
For Part 9 buildings, joist cavities formed by wood I-joists are sometimes used for air duct or plenum systems for heating systems with rated heat energy input not exceeding 120 kW and in which the air temperature does not exceed 120°C. Are the I-joists compliant with the materials characteristics required for this use; for example: flame spread rating, smoke developed classification, smoothness, etc?
Interpretation:
No.
Sentence 9.33.6.2.(2) sets out the criteria for conformance of plenums containing combustible materials. One of these key criteria is conformance to Class 1 duct materials in CAN/ULC-S110-07, 'Tests for Air Ducts". In that standard, Class 1 duct materials are required to have a maximum flame spread rating of 25 without evidence of continued progressive combustion, and a maximum smoke developed classification of 50. The standard subjects test samples also to various durability tests such as for erosion.
Sentence 9.33.6.4.(2) also requires that when combustible coverings and linings, including associated adhesives and insulation are used for plenums and other parts of air duct systems, they shall have a flame spread rating not exceeding 25 throughout the material, and a smoke developed classification not exceeding 50.
Typically, wood I-joists can be expected to have surface characteristics with flame spread rating as much as 150 and smoke developed classification as much as 300, and if not specially treated, cannot meet a Class 1 standard.
Note however, that there are exceptions in Sentences 9.33.6.2.(5) &(6) for such combustible plenum systems contained entirely within a dwelling unit.
Where the rated heat energy input exceeds 120 kW and in which the air temperature exceeds 120°C, the system must conform to Subsection 3.6.5 and Part 6.
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| 2012 |
12-0050 |
Potable Water Cross Connection - Premise Isolation |
15/01/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0050 INTERPRETATION Page 1 of 1
Interpretation Date: February 17, 2015
Building Code Edition: BC Plumbing Code 2012
Subject: Potable Water Cross Connection - Premise Isolation
Keywords: Cross Connection, Potable Water, Premise Isolation
Building Code Reference(s): 2.6.2.6.(1), Appendix A, Intent Statement
Question:
1. Is the intent of Sentence 2.6.2.6.(1) to require premise isolation when a potentially severe health hazard may be caused by backflow from a fixture or device?
2. If a building contains a trap primer, which is classified as a severe hazard, and this trap primer is protected by an air gap, would Sentence 2.6.2.6.(1) still require the potable water system to be provided with premise isolation by the installation of a reduced pressure principle backflow
preventer (RPBP)?
Interpretation:
1. No
Sentence 2.6.2.6.(1) states, in part, "for buildings or facilities where a potentially severe health hazard may be caused by backflow, the potable water system shall be provided with premise isolation by the installation of a reduced pressure principle backflow preventer". This means that there are identified buildings or facilities which require premise isolation, (examples of these building types are given in Appendix A -A-2.6.2.6.(1)), not solely because a severe health hazard exists at a fixture or device. For example, a building that contains a boiler with a snow melt system presents a potentially severe hazard, but the protection provided by the RPBP on the potable water connection to the boiler would be adequate. On the other hand, a hospital which contains operating, mortuary or laboratory facilities would require premise isolation in addition to the required device(s) at the individual connection(s) to equipment or fixtures.
The key part of Sentence 2.6.2.6.(1) is that it relates to "buildings or facilities where a potentially severe health hazard may be caused by backflow". This interpretation is further supported by the Intent Statement which reads 'To limit the probability that an inability to isolate portions of potable water systems in such buildings or facilities will lead to the spread of contaminated water beyond the premise of origin, which could lead to the spread of a potentially severe health hazard, which could lead to harm to persons".
2. No (see answer above)
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| 2012 |
12-0051 |
Fire Separation Requirements for Various Types of Vestibules |
16/03/2021 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0051 INTERPRETATION Page 1 of 3
Interpretation Date: May 19, 2015 (revised December 9, 2018)
Building Code Edition: BC Building Code 2012
Subject: Fire separation requirements for various types of vestibules
Keywords: Fire separation, vestibules
Building Code Reference(s): 3.2.6.2.(4), Appendix B-3.2.6.2.(4), (3.2.6.3.(1),
Appendix B-3.2.6.3.(1), 3.2.8.5.(1)(b), 3.3.5.4.(1), 3.3.5.7., 3.4.4.4.(7),(8)
Question:
The building code requires the installation of vestibules for a number of different reasons, but it is often not clear as to the required fire-resistance rating (FRR) for the perimeter walls of these vestibules. Please clarify the required fire-resistance ratings for fire separation walls for the various types of vestibules.
Interpretation:
Except as noted below, when the building code requires a vestibule, the vestibule walls should be constructed as fire separations with no fire-resistance rating. All doors that open onto the vestibule must have self-closing devices and positive latching.
For all building types:
The wall between a vestibule and an exit stair requires the same FRR as required for the exit stair per Article 3.4.4.1.
The wall between a vestibule and an elevator hoistway requires that same FRR as required for the elevator hoistway per Article 3.5.3.1.
The wall between a vestibule and a room that requires a fire separation (e.g. a service room that contains fuel-fired equipment) must have the same FRR that is required for the room.
For High Buildings per Subsection 3.2.6.
When vestibules are required between the following components, vestibule perimeter walls must be constructed as fire separations with the following fire-resistance ratings:
When an elevator hoistway penetrates a floor above the lowest exit storey (e.g. Level 2 floor slab when Level 1 is the exit storey) as well as the floor of the storey immediately below the lowest exit storey (e.g. Level 1 floor slab when Level 1 is the exit storey), elevator lobbies that are located below the lowest exit storey will be separated as follows:
To a public corridor 45 min FRR App B-3.2.6.2,(4)
To any stair or elevator shaft 2 hour FRR App B-3.2.6.2,(4) To any floor area other than public corridor 2 hour FRR App B-3.2.6.2,(4)
High building connected to another building 2 hour FRR 3.2.6.3.(1), App B-3.2.6.3.(1)
The wording of Sentence 3.2.6.2.(4} clearly states that "measures shall be taken to limit movement of smoke from a fire in a "floor area" below the lowest exit storey (i.e. Level P1J into upper storeys (i.e. Level 1J".
Appendix B-3.2.6.2.(4) refers to an elevator hoistway that penetrates the "floor of the storey immediately below the exit storey".
Note that the definition of "storey" means that portion of the building that is situated between the top of any floor and the top of any floor next above it.
This means that the Level 1 floor slab is the floor of the storey immediately below the lowest exit storey when Level 1 is the lowest exit storey as describe is Appendix B-3.2.6.2.(4).
Refer to the sketches on Page 3 for further clarification.
Elevator 1 does not require a fire rated CO vestibule because it does not penetrate the Level 1 floor slab (the floor of the storey below the exit level.
Elevator 2 does not require a fire rated CO vestibule because it does not penetrate the Level 2 floor slab (the floor of the storey above the exit level).
Elevators 3 & 4 require fire rated CO vestibules because they penetrate both the Level 1 and Level 2 floor slabs (the floors of the storeys below and above the exit level).
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| 2012 |
12-0053 |
Visibility of Leading Edges of Stair Treads and Landings |
19/05/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0053 INTERPRETATION Page 1 of 1
Interpretation Date: May 19, 2015
Building Code Edition: BC Building Code 2012
Subject: Visibility of Leading Edges of Stair Treads and Landings
Keywords: Treads, Landings, Demarcation, Visible
Building Code Reference(s): 3.4.6.1.(1)
Question:
Can the demarcation of the leading edge of stair treads and landings be provided by contrasting colours or patterns only on the stair tread or landing, with no additional demarcation on the riser?
Interpretation:
Yes.
Clause 3.4.6.1. (1)(b) requires the surfaces of ramps, landings and treads that are accessible to the public to have either a colour contrast or a distinctive pattern, readily visible from both directions of travel, to demarcate the leading edge of the tread and the landing, as well as the beginning and end of a ramp.
This is a performance-based requirement, since the type, dimension and location of the colour contrast or pattern are not specified. For a person descending a stair, a colour contrast or distinctive pattern on the treads at the leading edges will be visible for all treads in a straight flight. For a person ascending a stair flight, the colours or patterns on the treads will be visible for the treads up to about eye level in front of the person, which would be approximately 5 to 10 steps ahead depending on the stair rise and on the person's height. This is considered to be sufficient to meet the Building Code intent by allowing persons to identify the leading edge of stair treads and landings.
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| 2012 |
12-0054 |
Mezzanines |
16/06/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0054 INTERPRETATION Page 1 of 2
Interpretation Date: June 16, 2015
Building Code Edition: BC Building Code 2012
Subject: Mezzanines
Keywords: Mezzanines, enclosed mezzanine, open mezzanine
Building Code Reference(s): Sentences 3.2.1.1.(3), (4) & (7)
Question:
An existing 1 storey building contains 2 separate suites (Suites A & B) of Group F Division 2 major occupancy. These 2 suites share a demising separation wall.
The owner proposes to combine these 2 suites into a single suite by installing a new man door (2.1 sq.m. in area) in the demising wall.
The existing Suite A is 312 sq.m. in area and contains an existing open mezzanine of 55.6 sq.m. The existing Suite Bis 334 sq.m. in area and does not contain any mezzanine.
After combining the 2 suites into a single suite, the owner proposes to construct a new enclosed mezzanine with an area of 46 sq.m within the former Suite B.
This new mezzanine will exceed 10% of the area of the former Suite B, but it will be less than 10% of the total combined area of the single suite that is created by combining both the former Suites A and B.
1. Does the n e w enclosed mezzanine in Suite B conform to Article 3.2.1.1., if Suites A and B are combined as a single suite that retains the separation wall but simply includes a new man door (2.1m2) in the former demising wall?
2. Must the new mezzanine comply with both Sentences 3.2.1.1.(3) and 3.2.1.1.(4)?
3. Does Sentence 3.2.1.1.(7) apply to the new mezzanine in former Suite B?
Interpretation:
1. Yes
If Suites A and B are combined to operate as a single suite, then the unenclosed mezzanine in the former Suite A would comply with Clause 3.2.1.1.(3)(a) since more than 60% of the horizontal plane of the "room" in which it is located is open.
The new enclosed mezzanine in the former Suite B would comply with Sentence 3.2.1.1.(4)
since the area of the new enclosed mezzanine would be less than 10% of the area of the combined "suite".
2. No.
A mezzanine within a suite can comply with either Sentences 3.2.1.1.(3) or 3.2.1.1.(4).
3. No.
Sentence 3.2.1.1.(7) only applies to "open" mezzanines as described in Sentence 3.2.1.1.(3). Since the "enclosed" mezzanine in the former Suite B is designed as an "enclosed" mezzanine per Sentence 3.2.1.1.(4), Sentence 3.2.1.1.(7) does not apply.
Refer also to previous interpretations 98-0067 and 98-0069.
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| 2012 |
12-0055 |
Manufactured Folding Doors |
16/06/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0055 INTERPRETATION Page 1 of 1
Interpretation Date: June 16, 2015
Building Code Edition: BC Building Code 2012
Subject: Manufactured Folding Doors
Keywords: Manufactured, pre-assembled, NAFS, site-built
Building Code Reference(s): 9.7.4.1, 9.7.4.2., 9.7.5.1.
Question:
Since most of the manufactured folding doors are assembled on site can they be considered as site-built doors as per Article 9.7.5.1.?
Interpretation:
No.
Article 9.7.4.2. requires windows, doors and skylights to conform to North American Fenestration Standard/ Specification for windows, doors and skylights (NAFS 2008).
Section 1.1 of NAFS specifies the scope of the standard that applies to operating and fixed, prime and replacement windows, doors, tubular daylighting devices, and unit skylights installed into exterior building envelopes.
It also states that this standard does not include interior windows and doors; vehicular access doors (garage doors); sloped glazing; curtain wall and storefront; storm windows and doors; commercial entrance systems; sunrooms; revolving doors; site-built door systems; and commercial steel doors. Manufactured folding doors installed into exterior building envelopes are not listed in the exemptions; therefore, they have to conform to NAFS.
Although folding doors are usually assembled on site they cannot be considered as site-built doors since they are shipped from one distinct manufacturer as per the explanation of Bulletin B13-06 issued by the Building and Safety Standards Branch.
It is interpreted that all folding doors shall be considered as specialty product (SP) according to Table 5 of the NAFS and shall be tested accordingly.
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| 2012 |
12-0056 |
Fire Detectors Required by the Elevating Devices Safety Regulation-ASME A17.1/CSA B44-10 |
19/05/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0056 INTERPRETATION Page 1 of 1
Interpretation Date: May 19, 2015
Building Code Edition: BC Building Code 2012
Subject: Fire Detectors Required by the Elevating Devices Safety Regulation-ASME A17.1/CSA B44-10
Keywords: Fire Detectors, Fire Alarm System, Elevating Devices
Building Code Reference(s): 3.5.2.1.(1); 3.2.4.1., 3.2.4.11.
Question:
This project is an unsprinklered building that is not required to be equipped with a fire alarm system as described in Article 3.2.4.1.
If this project is provided with an elevator, does that trigger a requirement to install a complete fire alarm system throughout the building to accommodate the fire detectors that are required by ASME A17.1/CSA B44-10 (Safety Code for Elevators and Escalators) for elevator recall?
Interpretation:
No
Article 3.2.4.1. describes when a building requires a fire alarm system.
The requirements of Article 3.2.4.11. for fire detectors do not apply to buildings that do not require a fire alarm system per Article 3.2.4.1.
ASME 17.1/CSA B44-10 requires automatic recall of all elevators, regardless of building type. This Standard requires smoke detectors in the following locations:
1. Top of each elevator shaft
2. Within each elevator machine room
3. At every elevator lobby on each floor level
This Standard also states that if a fire detector (smoke or heat) is provided within an elevator pit, when actuated, it must also initiate elevator recall and the elevator car should go to the upper of the 2 recall levels (i.e. furthest away from the elevator pit). The provision of a fire detector in the elevator pit is not mandated by the Standard.
The fire detectors required by ASME 17.1/CSA B44-10 do not trigger a requirement for a fire alarm system throughout the building.
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| 2012 |
12-0057 |
Spatial Separation Measurement Near the Corners of Buildinqs |
15/09/2015 |
AIBC, APEGBC, BOABC,
POABC
File No: 12-0057 INTERPRETATION Page 1 of 2
Interpretation Date: September 15, 2015
Building Code Edition: BC Building Code 2012
Subject: Spatial Separation Measurement Near the Corners of Buildinqs
Keywords: Spatial Separation, Limiting Distance
Building Code Reference(s): 1.4.1.2.(1); 3.2.3.1.; A-3.2.3.; 9.10.14; 9.10.15.; A-9.10.15.
Question:
Where there are two separate buildings on the same site, that are near to one another at corners (i.e. 90-degree corners where the projection of each face does not intersect with the adjacent building), does the limiting distance need to be measured to :
1. A Limiting Distance Reference Line for each of the two buildings? or,
2. To the Property Line without considering the location of the adjacent building?
3. Would it be possible to subdivide this property in future?
Interpretation:
1. No
The lines that are suggested (see p.2 of 2 - drawing A) are not Limiting Distance lines as referenced in definition of Sentence 1.4.1.2.(1). "The Limiting Distance is( ... ) an imaginary line between 2 buildings( ... ) measured at right angles to the exposing building face." See more explanations in Appendix Subsections A-3.2.3 and A-9.10.15.
2. Yes.
At this configuration of the site, the Limiting Distances in drawing B have to be measured to the property lines. It must be noted that any projections (protrusions, decks, balconies or roof eaves) of one of the buildings to another, which becomes extended within the area of limiting distance of the other building, would have to be dealt with according to the provisions of Article
3.2.3.1. or Subsection 9.10.14. or 9.10.15.
3. The subdivision of the property is regulated by different regulations than BCBC 2012. As it is noted in Appendix Subsection A-3.2.3. in case that one property inflicts conditions on to the other by having a limiting distance measured not to the property line the legal agreement would normally be registered with the titles of both properties.
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| 2012 |
12-0058 |
Elevator in a Walkway between Buildings |
16/06/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0058 INTERPRETATION Page 1 of 1
Interpretation Date: June 16, 2015
Building Code Edition: BC Building Code 2012
Subject: Elevator in a walkway between buildings
Keywords: Elevator, Walkway between Buildings
Building Code Reference(s): 3.2.3.19.
Question:
This project contains 2 separate buildings that are connected with an above ground walkway as described in Article 3.2.3.19.
Is it permitted to have an elevator connected to the walkway?
Interpretation:
Yes
There are no restrictions in the building code that would prevent an elevator from being connected to an above ground walkway between 2 buildings.
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| 2012 |
12-0059 |
Stair or Elevator Tower Serving Occupancies "above" a Storage Garage |
03/09/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0059 INTERPRETATION Page 1 of 1
Interpretation Date: September 3, 2015
Building Code Edition: BC Building Code 2012
Subject: Stair or elevator tower serving occupancies "above" a storage garage
Keywords: Stair or elevator tower, carbon monoxide control, vestibules
Building Code Reference(s): 3.3.5.4.(1)
Question:
Sentence 3.3.5.4.(1) indicates that if access is provided from a storage garage to a stair or elevator tower serving occupancies "above" the level of the storage garage, an intervening carbon monoxide control vestibule must be provided.
In a design where the non-parking occupancies (such as office use) being served by the parking, are beside the storage garage via a stairshaft, but at an elevation higher than the level of the storage garage (at an intermediate level between storeys), is it also considered as being "above" the storage garage for the purposes of carbon monoxide control?
Interpretation:
Yes.
The intent of Sentence 3.3.5.4.(1) is to provide for control of carbon monoxide potentially moving to upper storeys of a building via stair or elevator towers (shafts). The hazard being addressed is the potential for stack effect mechanisms and air leakage at openings, combining to move hazardous concentrations of carbon monoxide contaminated air through vertical shafts and into non-parking occupancies at a higher elevation than the parking level.
Floor levels which are located on the same storey or floor elevation are not covered by Sentence 3.3.5.4.(1). Article 3.3.5.7 is the Building Code reference which addresses the hazards of carbon monoxide movement on the same storey or floor elevation as a storage garage; including those portions of floors that are at a higher elevation, but on the same storey, as a storage garage; but whose levels are not connected by a stair or elevator shaft.
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| 2012 |
12-0060 |
Maximum Unsupported Height of Wood Studs |
15/09/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0060 INTERPRETATION Page 1 of 1
Interpretation Date: September 15, 2015
Building Code Edition: BC Building Code 2012
Subject: Maximum unsupported height of wood studs
Keywords: Maximum unsupported height, wood studs
Building Code Reference(s): Table 9.23.10.1.
Question:
A previous Interpretation 98-0120, based on the 1998 BC Building Code, clarified that the "Maximum Unsupported Height" in the former Table 9.23.10.A. means the vertical height of a stud between lateral members that brace the strong axis of the stud. The intent of this interpretation was to clarify the unsupported height related to overall height of the stud between lateral supports, rather than the height of a portion of stud between horizontal blocking within the stud space.
Please clarify if the "Maximum Unsupported Height" is intended to be the height of the vertical stud itself, or if it is intended to be the height of the entire stud wall which includes the stud plus the top and bottom plates.
Interpretation:
Table 9.23.10.1. has been in the building code since the 1977 edition of the National Building Code of Canada. This Table originated based on experience, rather than any engineering calculations.
Therefore a designer should be conservative in their design approach when applying this Table.
Conventional wood framing of a wood stud wall includes a double top plate and a single bottom plate. The upper face of the double plate is laterally braced by the underside of the roof or floor joists. The bottom face of the bottom plate is laterally braced. by the floor sheathing.
With such conventional framing, the top and bottom plates are adequate to transfer the lateral forces from the lateral framing members to the top and bottom of the wood stud itself. Therefore, using conventional framing, the "Maximum Unsupported Length" would be the actual length of the wood stud itself rather than the overall height of the wood stud wall which includes the top and bottom plates.
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| 2012 |
12-0061 |
Foamed Plastic Insulation on Ducts |
20/10/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0061 INTERPRETATION Page 1 of 1
Interpretation Date: October 20, 2015
Building Code Edition: BC Building Code 2012
Subject: Foamed Plastic Insulation on Ducts
Keywords: Foamed Plastic, Supply Air, Return Air
Building Code Reference(s): 9.33.6.2.(5) and (6); 9.33.6.4.(5) and (6);
3.1.5.12.(2)
Question:
In a residential occupancy, is it acceptable to install sprayed foam insulation directly onto a supply air duct?
Interpretation:
No.
Sentences 9.33.6.2.(5) and (6) permit combustible ducts that are contained entirely within a dwelling unit, but this is not intended to include foamed plastic. Sentence 9.33.6.4.(5) prohibits foamed plastic insulation from being used as part of an air duct or for insulating an air duct. There is an exception in Sentence 9.33.6.4.(6) which permits foamed plastic insulation in a ceiling space that acts as a return air plenum, but only where the foamed plastic is covered by one of the thermal barriers described in Sentence 3.1.5.12.(2), such that the foamed plastic is not exposed to the plenum. This exception applies only to a return air plenum in a ceiling space, and not to a supply air duct.
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| 2012 |
12-0063 |
Bathroom Fan Installed Independently of a HRV |
20/10/2015 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0063 INTERPRETATION Page 1 of 1
Interpretation Date: October 20, 2015
Building Code Edition: BC Building Code 2012
Subject: Bathroom fan installed independently of a HRV
Keywords: Bathroom fan, HRV, RSI
Building Code Reference(s): 9.36.2.6.
Which tables, Tables 9.36.2.6.A. or B., should be used to determine the minimum required RSI values if bathroom fans are installed independently of a HRV?
Table 9.36.2.6.B.
Table 9.36.2.6.A and B list the minimum effective thermal resistance (RSI) of above-ground opaque building assemblies based on whether a heat recovery ventilator (HRV) is installed.
Appendix A-9.36.2.6.(1) explains that "the insulation values in Table 9.36.2.6.A. are based on mechanical ventilation solutions without HRV, while those in Table 9.36.2.6.B. are based on a HRV that operates for at least 8 hours a day throughout the year at the minimum required ventilation capacity. The operation of the HRV affords a reduction in the RSI values for some assemblies, most notably for walls and rim joists."
9.32.3.6.(1)(b) requires an exhaust fan in every bathroom unless the bathroom is served by the principal ventilation system exhaust fan. It does not prohibit the owner from installing extra bathroom fans in addition to the principal ventilation system exhaust fan.
If a house has a HRV and additional bathroom fans are installed to exhaust excessive moisture and steam, Table 9.36.2.6.B should be used·to determine the minimum RSI.
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| 2012 |
12-0064 |
Fire Protection of Exits (Exit Exposure Protection) for Houses with Secondary Suites |
16/09/2015 |
Interpretation Date: September 16, 2015
Building Code Edition: BC Building Code 2012 (after December 19, 2014)
Subject: Fire protection of exits (exit exposure protection) for houses with Secondary suites
Keywords: unprotected openings, fire protection of exits, exit exposure protection, houses, secondary suites
Building Code Reference(s): 9.9.4.1.(1), 9.9.4.4.(1), 9.9.4.6.(1), 9.10.13.5, 9.10.13.7,
9.37.2.8.(1)
Question:
A single family dwelling has a "basement" secondary suite. The single exterior exit door of the secondary suite opens to an exterior travel path 900mm long and then travels outside up 3 steps to level ground. Above this exterior means of egress are windows of the main suite within the exposing limits described by Sentences 9.9.4.4.(1) and 9.37.2.8.(1).
1. Are the 3 steps considered an unenclosed exit stair contemplated by Sentences 9.9.4.1.(1) and 9.37.2.8.(1)?
2. Would the exposing windows of the main suite above require fire protection (exit exposure protection)?
3. Is Division B Appendix A commentary A-9.37.2.8. giving the Authority having Jurisdiction the ability to override the Building Code?
Interpretation:
1. No.
Sentence 9.37.2.8.(1) is the applicable reference for houses containing a secondary suite, not Sentence 9.9.4.1.(1).
A set of 3 exterior steps (3 risers) or less, serving a single dwelling unit does not require handrails and would not be considered a flight of stairs. Similarly 3 steps would not be considered unenclosed stairs as contemplated by Sentence 9.37.2.8.(1).
2. Some judgement is required to the specific condition under review. The explanatory commentary in Division B Appendix A A-9.37.2.8 indicates:
"Openings near Unenclosed Exit Stairs and Ramps
Unprotected door or window openings in other fire compartments adjacent to exit stairs and ramps should be protected from the other suite to provide safe passage to a safe area.
Normally such protection as required by Part 9 would extend both vertically and horizontally beyond the adjacent openings. This is considered excessive due to required fire safety measures and the relatively short travel distances in this type of building. The application of current Part 9 requirements would in many cases require the protection of all openings in entire faces of dwelling units, which could be very restrictive. Authorities should exercise judgment with regard to deciding which openings are close enough to the exit facility to pose a problem during the early stages of a fire and require appropriate opening protection. Those openings that directly pass the means of egress are required to be protected."
In this particular case, if the exterior means of egress for the secondary suite does not involve stairs and ramps, the windows of the main suite above the secondary suite are not considered an exposing condition under Sentence 9.37.2.8.(1). ·
Sentences 9.9.4.1.(1), 9.9.4.4.(1), and 9.9.4.6.(1), are applied for multiple suites under Part 9 and would be considered excessive protection.
Further considerations that could be used in the assessment include whether the building is sprinklered or not, whether combustible or noncombustible construction and / or cladding are used, travel distances within the suites, detection and alarm systems provided, etc.
3. No.
.Discussion and exercise of judgement is needed by both the design proponent and the Authority having Jurisdiction to arrive at an appropriate protection regime.
See discussion under previous question 2.
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| 2012 |
12-0065 |
Mezzanines, Occupancy of Space, Area and Travel Distance Limits |
19/01/2016 |
Interpretation Date: January 19, 2016
Building Code Edition: BC Building Code 2012
Subject: Mezzanines, occupancy of space, area and travel distance limits
Keywords: Mezzanine, occupancy of space, areas, travel distance
Building Code Reference(s): 3.2.1.1, 3.3.1.5, 3.3.1.6, 3.4.2.2.(2), Table 3.4.2.2
Question:
In a space containing a mezzanine, the specific use and occupancy of the mezzanine may be classified different from that of space within which it is contained.
If the occupancy of the mezzanine is classified differently from the space below, in applying the criteria of Table 3.4.2.2., in the first column labelled "Occupancy of Space", does the term "Space" refer to the area above the mezzanine, and not to the space below?
Interpretation:
Yes.
In Table 3.4.2.2., in the first column labelled "Occupancy of Space", the term "Space" refers to the area of the space above the mezzanine, not to the area of the space below the mezzanine level.
In other words the occupancy classification of the specific uses above the mezzanine is used in applying the limits criteria in Table 3.4.2.2. The title of this table refers to " Mezzanine Space",
therefore "Occupancy of Space" refers to the use and occupancy of that same space. This is reinforced by use of the phrase "space above a mezzanine... " in Sentence 3.4.2.2.(1). This has the potential of creating an anomaly in having different criteria applied to each level, however note that Article 3.2.1.1. has area limits in relation to the level below the mezzanine, and Article 3.3.1.5, may be more restrictive.
The application of Article 3.4.2.2. to the space above the mezzanine may differ depending on whether the space containing the mezzanine requires 1 or 2 means of egress.
single egress door, with anlenclosed mezzanine of office use (subsidiary) complying with Sentence Take for example, a fully sprinklered warehouse space classified Group F Division 2 and served by a 3.2.1.1.(4).
The warehouse suite with office mezzanine, would be regulated for area limits, travel distance and occupant load by Article 3.3.1.5 based on the most restrictive criteria applied to the suite in its entirety. The suite would be permitted a maximum area of 200m2 and maximum travel distance 25m to the single egress door. However application of Table 3.4.2.2 for the office mezzanine would also permit a maximum area of 200m2 and maximum travel distance 25m to the egress door. However the enclosed office mezzanine area is already restricted by Article 3.3.1.5 applied to the entire suite, since the office mezzanine is an integral part of the suite. Sentence 3.2.1.1.(4) applied to the mezzanine, would also be more restrictive than the 200m2 permitted for the mezzanine in Sentence 3.4.2.2.(2). In this case, travel distance limits would be the same for both levels.
For a fully sprinklered warehouse space classified Group F Division 2 and served by 2 separate required egress doors, with an enclosed mezzanine of office use complying with Sentence 3.2.1.1.(4); the results are different. The warehouse area is limited by Sentence 3.3.1.6.(1) to 45m travel distance to the nearest of the 2 egress doors. Application of Table 3.4.2.2 for the office mezzanine would permit a maximum area of 200m2 and maximum travel distance 25m measured to the top of the mezzanine stair. The enclosed office mezzanine area is also restricted by Sentence 3.2.1.1.(4), which may or may not be more restrictive than the 200m2 perm-itted for the mezzanine in Sentence 3.4.2.2.(2).
This interpretation is consistent with past BC Building Code Appeal number 1607. The following page contains illustrations of the examples given.
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| 2012 |
12-0066 |
Vertical Transition of Combustible to Non-Combustible DWVpipe |
21/11/2017 |
Interpretation Date: November 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Vertical transition of combustible to non-combustible DWVpipe
Keywords: Combustible DWV Piping, non-combustible DWV Piping, transition
Building Code Reference(s): 3.1.5.16., 3.1.9.1.(1), 3.1.9.4.(3), (4), (5); 9.10.9.7
Question:
Can a vertical transition from combustible plastic drain, waste and vent (DWV) pipe (on the bottom) to non-combustible cast iron DWW pipe (on the top) take place above a fire-rated slab in a multi storey building as long as a listed fire stop is used, such as cUL-F-8-2009, which includes the transition within the listed assembly?
Interpretation:
No.
The transition from combustible to non-combustible DWV pipe in cUL F-8-2009 was located above the floor slab in the unexposed side while the firestop system below the slab is in the fire exposed side. If the non-combustible pipe, after the transition, is extended through the floor above it makes the transition located on the fire exposed side if a fire occurs on the upper side of the floor slab where the transition takes place. During a fire condition above the slab the transition will fail leaving the non combustible pipe open creating a chase through which flame and smoke can spread to the floor above (see attached illustration).
Clause 3.1.9.1.(1)(a) requires that the fire stop when subjected to the fire test method in CAN/ULC S115 has the required fire-resistance rating. Since the transition has not been tested on the fire exposed side (within the test furnace) it would not be able to confirm if the fire stop has the required fire-resistance rating.
It is not acceptable for the transition from a combustible DWV pipe (on the bottom) to a non combustible DWV pipe (on the top) to take place above the fire-rated slab if the non-combustible pipe
R. J. Light, Committee Chair
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| 2012 |
12-0067 |
Direction of Swing for Exit Discharge Lobby Enclosure |
18/01/2016 |
Interpretation Date: January 18, 2016
Building Code Edition: BC Building Code 2012
Subject: Direction of swing for exit discharge lobby enclosure
Keywords: Exit, Exit through· the Lobby, Exit Door
Building Code Reference(s): Div A 1.4.1.2.(1); 3.4.4.2., 3.4.6.12.(1)
Question:
Are all the doors opening into a lobby that serves as an exit lobby according to Article 3.4.4.2. require to swing into the direction of exit travel?
Interpretation:
Yes.
Clause 3.4.4.2.(2)(e) states that the exit lobby must conform to the requirements for exits with four exceptions. None of these exceptions address the door swing into the exit lobby. Sentence 3.4.6.12.(1) requires to swing the door in the direction of exit travel.
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| 2012 |
12-0068 |
Fire Department Access to Buildings Separated by Firewalls |
19/01/2016 |
Interpretation Date: January 19, 2016
Building Code Edition: BC Building Code 2012
Subject: Fire Department Access to Buildings Separated by Firewalls
Keywords: Fire Department Access, Firewall
Building Code Reference(s): 3.1.10, 3.2.1.2., 3.2.2.10.(1), 3.2.4.2,
3.2.5.4, 3.2.5.5, 3.2.5.6, 9.10.20.3
Questions:
1. If a firewall separates two adjoining Part 3 buildings so that each is considered as a separate building for application of Building Code requirements, is each building required to face a street for fire department access?
2. Does the answer to question 1 depend on whether there is a public corridor connecting the buildings through the firewall?
3. Does the answer to question 1 depend on whether the adjoining buildings are different construction classes, such as one building requiring noncombustible construction while the other is permitted combustible construction?
4. Is the answer for question 1 different for Part 9 buildinQs?
Interpretation:
1. Yes, if the building is more than 3 storeys in building height or more than 600 m2 in building area.
A firewall or firewalls conforming to Subsection 3.1.10 can divide a project into two or more buildings. This may allow less stringent construction requirements to be applied to the smaller separated buildings than to a larger building without firewalls.
Sentence 3.2.2.10.(1) requires every building to face a street in conformance with the requirements of Articles 3.2.5.4 and 3.2.5.5 for access routes. Article 3.2.5.4 requires access routes for fire department vehicles to buildings that are more than 3 storeys in building height or more than 600 m2 in building area. Where Article 3.2.5.4 requires fire department vehicle access routes, they are required to conform to Article 3.2.5.5. The principal entrance and any access openings (if required) must be between 3 m and 15 m from the access route.
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| 2012 |
12-0069 |
Draft Stops and Closed Spaced Sprinklers |
17/11/2015 |
Interpretation Date: November 17, 2015
Building Code Edition: BC Building Code 2012
Subject: Draft Stops and Closed Spaced Sprinklers
Keywords: draft stops, sprinklers, interconnected floor space
Building Code Reference(s): 3.2.8.2.(6), 3.2.8.7., Div. A 1.5.1.2.,
NFPA 13-2013 - 8.15.4.1.
Question:
In a building that is sprinklered throughout, and which contains an interconnected floor space as permitted by Sentence 3.2.8.2.(6), are draft stops and close spaced sprinklers required around the openings through the floor?
Interpretation:
No
Sentence 3.2.8.2.(6) permits an interconnected floor space without having to meet the requirements of Articles 3.2.8.3. to 3.2.8.9. Sentence 3.2.8.2.(6) permits openings through the 'floor for stairs, escalators and moving walkways in unsprinklered buildings, and any other floor opening in sprinklered buildings.
Sentence 3.2.8:2.(6) is a unique type of interconnected floor space that only applies to limited number of projects that meet the following criteria:
a) the interconnected floor space consists of the first storey and the storey next above or below it, but not both,
b) the openings through the floor are used only for stairways, escalators or moving walks or the
interconnected floor space is sprinklered throughout (see t,ppendix A), ·
c) the interconnected floor space contains only Group A, Division 1, 2 or 3, Group D, Group E, or Group F, Division 2 or 3 major occupancies (see Appendix A), and
d) the building area is not more than one half of the area permitted by Subsection 3.2.2.
Article 3.2.8.7. requires draft stops around openings through a floor in an interconnected floor space, but this Article is waived for interconnected floor spaces that meet the requirements of Sentence 3.2.8.2.(6).
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| 2012 |
12-0070 |
Insulation, Skylight Curbs, Effective Thermal Resistance |
19/01/2016 |
Interpretation Date: January 19, 2016
Building Code Edition: BC Building Code 2012
Subject: Insulation of curbs supporting skylights
Keywords: Insulation, skylight curbs, effective thermal resistance
Building Code Reference(s): 9.25.1.1.(2), 9.25.2.1.(1), 9.25.2.3, 9.36.2.3.(1), 9.36.2.4,
9.36.2.5, 9.36.2.6.(4)
Question:
For Part 9 buildings, where a roof curb supports a skylight assembly, and also separates interior conditioned space from exterior unconditioned space; is thermal insulation required to be provided for such a roof curb assembly? ·
Interpretation:
Yes.
Subclause 9.25.1.1.(2)(a)(i) requires that assemblies separating conditioned space from unconditioned space or exterior air, must be provided with insulation conforming to Subsection 9.25.2 and Section 9.36.
Sentence 9.25.2.1.(1) similarly requires that assemblies separating heated space from unheated space or exterior air, must be provided with insulation tci prevent condensation on the room side and to provide comfortable conditions for occupants.
Sentence 9.25.2.3.(1) requires that insulation shall be installed to achieve a reasonably uniform insulating value over the entire face of the insulated area.
Sentence 9.36.2.3.(1) requires that the gross roof-ceiling assembly area shall be calculated as the sum of the interior surface areas of insulated roof-ceiling assemblies and of skylight openings.
Sentence 9.36.2.4.(3) exempts from being taken into account in the caiculation of effective thermal resistance: major structural penetrations such as balcony and canopy slabs, beams, columns and ornamentation or appendages that must completely penetrate the building envelope to perform their intended function. This is in recognition of the practical difficulty or prohibitive cost of achieving thermal breaks for such components
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| 2012 |
12-0071 |
Occupancy Classification of Memory Care Facilities |
19/04/2016 |
Interpretation Date: April 19, 2016
Building Code Edition: BC Building Code 2012
Subject: Occupancy classification of memory care facilities
Keywords: Occupancy classification, memory care, special care, alzheimers, dementia, security control, impeded egress, contained use, locking devices
Building Code Reference(s): Div A 1.4.1.2.(1) definitions of "care", "care occupancy", "contained use area", "detention occupancy", "impeded egress zone", "treatment", "treatment occupancy", Div B Appendix A A-3.1.2.1.(1), 3.2.2.19, 3.3.1.13.(2), 3.3.3,
Div B Appendix A A-3.3.3.1.(1), 3.3.3.7, 3.4.6.16.(1),
Question:
1. What is the appropriate occupancy classification for special care facilities with occupants (more than 10 persons) needing memory care treatment such as for alzheimers or dementia?
2. What is the appropriate occupancy classification for special care facilities with occupants (more than 10 persons) needing memory care treatment such as for alzheimers or dementia, and where in addition, special security control is also provided for t_he safety of such occupants?
Interpretation:
1. Group B, Division 2 or 3.
Treatment or care facilities without correctional or detention intentions may include special memory care. Occupants in such facilities may not be expected to be readily moved or evacuated without some degree of assistance or additional protection features, such as for example, additional fire compartment zone separations in the floor areas to allow transfer into protected floor areas in an emergency.
There is a wide range of levels of severity of alzheimers or dementia. Provincial community care regulation and licensing, and medical and care facilities operators and professionals, are typically involved in determining and deciding on, the level of care necessary and the appropriate type of facility needed, for the occupants needing memory careAfter such determination, these facilities can then be appropriately classified Group B, Division 2 or 3, depending on the level of care and service to be provided for the memory care occupants.
Therefore it is considered that treatment or care facilities not intended for correctional purposes, but including occupants needing special consideration due to dementia or alzheimers conditions, may be classified as Group B Division 2 or 3 major occupancies, as appropriate to the level of care and service to be provided.
2. Group B, Division 1, 2 or 3.
Occupants in treatment or care facilities who suffer from alzheimers disease, dementia or other such debilitating afflictions, often run the risk of harm, accident or serious injury by wandering away from supervised areas without the facilities staff being aware of their leaving. Often the memory care occupant may attempt to use a means of egress by which to leave unnoticed.
Security control devices are therefore often implemented as part of the facility operations, to prevent such uncontrolled egress.
There are a range of levels of severity of alzheimers or dementia, as well as a range of levels of detention, treatment or care.
Appendix A A-3.1.2.1.(1) provides examples of various uses under Group B major occupancies. For Group B Division 1, the corre_ctional aspect is common to all the specific examples listed.
Occupants receiving memory care in a correctional type of facility are therefore classified as Group B Division 1. This is consistent with the Building Code definition of "detention occupancy" as· "the occupancy by persons who are restrained from or are incapable of evacuating to a safe location without the assistance of another person because of security measures not under their control."
Treatment or care facilities without correctional or detention intent on the other hand, can also include special memory care. These are regulated and licensed by Provincial community care and can be classified Group B Division 2 or 3 depending on the level of service provided.
Sentences 3.3.1.13.(2) and 3.4.6.16.(1) permit the use of locking devices on means of egress doors in buildings having impeded egress zones or contained use areas.
As indicated in the NRC User's Guide - NBC 1995 Fire Protection, Occupant Safety and Accessibility (Part 3) "An impeded egress zone will be found primarily in buildings associated
with correctional facilities, in which the occupants are able to move with relative freedom throughout the zone but are unable to leave the zone unless a security person releases locking devices on doors at the perimeter. These buildings are used for work and recreational activities and are not permitted to include sleeping rooms or rooms in which persons could bedetained........
The contained use area applies to a wide range of buildings, many of which would not
normally be classed as a care or detention occupancy." This commentary was written prior to the development of Group B Division 3 occupancy classifications.
An impeded egress zone or contained use area could also be less than 10% of a floor area, in which case Article 3.2.2.8. contains a waiver for considering these as major occupancies.
The Division B Appendix A A-3.3 commentary indicates: "Section 3.3 regulates safety within floor areas......For example, a building may be classified by major occupancy as an office building: therefore, the provisions for structural fire protection and fire protection equipment for office buildings prescribed in Section 3.2. apply. However, within that building, a room or floor area may be used for mercantile, care, treatment, detention, business, residential, industrial or other occupancy." Conversely a correctional facility could besides the Group B Division 1 occupancies, also have other facilities such as recreational, assembly, care or treatment, work and other occupancies.
Therefore memory care facilities that are not classified as Group B Division 1 could still have security control provisions such as using contained use areas or with locking devices such as permitted in Sentence 3.4.6.16.(4) for all occupancies.
Special locking technologies to address wandering patients risks to danger from leaving the premises unnoticed, have been developed and used. Where locking devices on means of egress doors vary from the code restrictions, or are not addressed in the Building Code, the security control systems devised to safeguard the wandering patient risk may have be addressed as alternative solutions, recognizing the memory care occupant safety risks if adequate security control is not provided.
It is noted that The National Building Code of Canada 2015 now provides in Sentence 3.4.6.16.(5), an acceptable solution for locking devices specifically for such treatment or care occupancies.
The following matrix simplistically summarizes the various levels of security control and level of memory care or service and appropriate occupancy classification:
----
The provision of security control systems in treatment and care occupancies classified as Group B Division 2 or 3 is consistent with the recognition that occupants in such facilities are not expected to be readily moved or evacuated without some degree of assistance or additional protection features, such as for example, additional fire compartment zone separations in the floor area to allow transfer into protected floor areas.
It is noted that some provisions permitted in Group B Division 1 occupancies are not compatible with treatment or care occupancies, such as for example Sentence 3.2.8.2.(4) permitting interconnection of 2 adjacent floor levels, whereas Sentence 3.2.8.2.(6) excludes Group B2 and B3 occupancies from such interconnecting of floors; Sentence 3.4.3.2.(8) permits narrower exit stairs and doorways for Group B1 occupancies, but not for Group B2 occupancies; classification to Group B2 occupancy would be needed to apply the special emergency power requirements of Article 3.2.7.6., etc.
Therefore it is considered that treatment or care facilities not intended for correctional or detention purposes, but including occupants needing special consideration due to dementia or alzheimers conditions, and having some security controls, are more appropriately classified as Group B Division 2 or 3 major occupancies.
Where the occupants having dementia or alzheimers are in a correctional or detention facility or where impeded egress zones are applied, the appropriate classification would be Group B Division 1.
There may be specific project conditions that require case specific analysis and applications, and conflicts between the Building Code and other health care facilities regulations, which may have to be discussed and agreed upon with the local Authority having Jurisdiction
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| 2012 |
12-0072 |
Minimum width of interior doors within a dwelling unit |
20/01/2022 |
File No: 12-0072 INTERPRETATION Page 1 of 1
Interpretation Date: January 20, 2016
Building Code Edition: BC Building Code 2012
Subject: Minimum width of interior doors within a dwelling unit
Keywords: Door width, interior, dwelling unit, Part 3
Building Code Reference(s): 3.3.1.23., 3.8.5.4., 9.5.5.1.
Interpretation:
1. No
Appendix note A-3.3.1.23.(1) includes some examples of "obstructions" such as posts, counters or turnstiles. Minimum door widths are addressed separately in the building code and vary, depending upon the use and location of the door.
2. No (except for Adaptable Suites)
Part 3 of the building code contains numerous requirements for minimum door widths for certain types of doors, but there are no specific requirements for interior doors within a dwelling unit in a Part 3 building.
3.3.1.13.(1)(a) - an egress door from the suite to a public corridor requires a minimum clear opening width of 800 mm.
3.3.3.4.(1) - an egress door from an individual suite of care occupancy to a public corridor requires a minimum clear width of 850 mm.
3.3.3.4.(2) - a doorway in a care occupancy which is used to move patients in beds requires a minimum clear width of 1050 mm.
Table 3.4.3.2.A- an exit doorway requires a minimum 800 mm width.
Table 3.4.3.2.B- an exit doorway in a Group B Div 2 or and Group B Div 3 occupancy requirements a minimum width of 850 mm (or 1050 mm when moving patients in beds).
3.8.5.4. - within adaptable suites - doorways providing access to common living areas and at least one bathroom and one bedroom to have a clear opening width of 800 mm.
Note that the BC Building Code Interpretation Committee has submitted a proposed change to the Building Safety and Standards Branch to provide a cross reference in Part 3 to Article 9.5.5.1. with respect to minimum widths of interior doors within a dwelling unit.
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| 2012 |
12-0073 |
Moisture Content of Lumber During Construction |
20/01/2016 |
File No: 12-0073 INTERPRETATION Page 1 of 1
Interpretation Date: January 20, 2016 - DRAFT
Building Code Edition: BC Building Code 2012
Subject: Moisture content of lumber during construction
Keywords: Moisture content, lumber
Building Code Reference(s): 9.3.2.5., 5.1.4.2.
Question:
1. Article 9.3.2.5. requires that the moisture content of lumber be not more than 19% at the time of installation. Are there any prescriptive requirements in Part 9 to limit the moisture content of lumber throughout the entire framing process?
2. If the answer to Question 1 is "no", are there any prescriptive requirements in Part 9 to limit the
moisture content of lumber prior to installing insulation and vapour barriers?
Interpretation:
1. No
Article 9.3.2.5. only addresses the moisture content of lumber at the time when the lumber is installed. It does not address moisture content of lumber after it has been installed.
2. No (with precautions)
Although there are no prescriptive requirements in Part 9 that address moisture content in lumber prior closing up the wall, floor and ceiling assemblies, it is recommended that the recommendations in the Building Enclosure Guide for Wood-Frame Multi-Unit Residential Buildings be implemented. This Guide recommends that the moisture content of lumber be reduced to less than 19% prior to closing up the lumber. This is particularly important for composite wood products since they are susceptible to deterioration when exposed to high moisture content.
It should be noted that Part 3 buildings which are designed to Part 5 are subject to Article
5.2.4.2. which includes a generic requirement that materials used in assemblies that are exposed to the exterior shall be resistant to any mechanism of deterioration. In order to meet this performance requirement, the recommendations of the Building Enclosure Guide provided appropriate solutions.
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| 2012 |
12-0074 |
Height of Door Sill to Residential Balcony |
17/05/2016 |
Interpretation Date: May 17, 2016
Building Code Edition: BC Building Code 2012
Subject: Height of Door Sill to Residential Balcony
Keywords: Door sill, balcony,
Building Code Reference(s): 3.3.4.7.(1), 9.5.5.1., 9.8.4.1.(1)
Question:
What is the maximum height of a door sill to a residential balcony within a dwelling unit before an additional step is required?
Interpretation:
In order to avoid water ingress at the ntrance from the balcony to the living area of a dwelling unit quite often a step-over balcony door sill is provided. Part 3 and Part 9 of the BC Building Code are silent in prescribing a maximum step-over height of the door sill before an additional step or landing is required. The requirements in Sentence 9.8.4.1.(1) (referenced by Sentence 3.3.4.7.(1)) governing stair rise and run may be a reasonable approach to address the safety issues.
Sentence 9.8.4.1.(1) allows a maximum of 200 mm for a stair riser within a dwelling unit. It is reasonable to use the same limitation for.the step-over height for the door sill at the balcony.
Even though a landing is not required attention should be paid to the width of the sill (including any baseboard heater installed along the side of the curb). Occupants may have difficulty stepping over a wide sill and may have to step on the sill. It is recommended that the sill shall not be more than 300 mm in width to facilitate the step over.
If the occupants have to step on the sill for access then the minimum headroom of 1980 mm measured above the sill as per Table 9.5.5.1 must be maintained.
Since the design of each door sill and the step over height may vary from project to project it is recommended that this situation should be discussed with the AHJ.
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| 2012 |
12-0075 |
Detached Carports |
19/04/2016 |
File No: 12-0075 INTERPRETATION Page 1 of 2
Interpretation Date: April 19, 2016
. Building Code Edition: BC Building Code 2012 (Revised December 19, 2014)
Subject: Detached Carports
Keywords: carports, exposing building face, spatial separation; glazed openings
Building Code Reference(s): 9.10.15.1.(1); 9.10.14.1.(1); 9.10.15.4.(1);9.10.15.4.(6);
9.10.15.5.(2); 9.10.15.5.(3); 9.10.15.5.(4); 9.10.15.5.(6);
. 9.10.15.5.(8), (9) and (10)
Question:
What requirements of spatial separation should apply to a detached carport serving a single family dwelling, Subsection 9.10.14 or Subsection 9.10.15?
Interpretation:
Subsection 9.10.15.
Effective December 19, 2014 Minister Order M290 adc;led Clause 9.10.15.1.(b) to the Code to regulate spatial separation requirements for accessory buildings that served a buildings that contain only dwelling units and have no dwelling unit above another dwelling, such as single family dwellings and side-by-side multi-family dwellings.
Subsection 9.10.14. remains unchanged. It applies to buildings other than those regulated by Subsection 9.10.15. Accessory buildings that serve other than single family dwellings or side-by-side multi-family dwellings are regulated by Subsection 9.10.14.
Sentences 9.10.15.4.(6), 9.10.15.5.(4) and (6) specifically regulate the construction of the exposing building faces of garages or accessory buildings that serves a single family dwelling. Although these three sentences do not specifically mention carport it is interpreted that a carport can be considered as a garage or an accessory building without any exterior walls; therefore, carport shall
| Download |
| 2012 |
12-0076 |
Fire Alarm Zoning of Sprinkler Systems |
20/09/2016 |
File No: 12-0076 INTERPRETATION Page 1 of 2
Interpretation Date: September 20, 2016
Building Code Edition: BC Building Code 2012
Subject: Fire Alarm Zoning of Sprinkler Systems
Keywords: Annunciator, Fire Waterflow Alarm, Zone Indication,
Building Code Reference(s): 3.2.4.9, 3.2.4.16
Questions:
Is the allowable area of a sprinkler zone on a storey governed by Sentence 3.2.4.9.(2) or by Sentence 3.2.4.16.(1)? For example, in a care or treatment occupancy, is the sprinkler system zone area limited to a maximum of 1000 m2 in areas with patients' or residents' sleeping rooms or is it limited by the system area limit of NFPA 13 which is substantially larger?
Interpretation:
The allowable sprinkler zone area is determined in accordance with Sentence 3.2.4.9.(2). For the example of the fire compartment in a care or treatment occupancy, the sprinkler zone area must conform to the fire compartment area.
Where a building requires a fire alarm annunciator, Sentence 3.2.4.9.(2) requires separate zone indication of the actuation of the alarm initiating devices, in the areas stated in Clauses a) through h) of that Sentence. Examples of areas that require separate zone annunciation include contained use areas, impeded egress zones, and fire compartments required by Sentence 3.3.3.5.(2) which are maximum 1000 m2 compartments in areas of care or treatment occupancies with patients' or residents' sleeping rooms.
Where an annunciator is required, Sentence 3.2.4.16.(1) requires that waterflow detecting devices be installed so that each device serves not more than one storey and an area on each storey that is not more than the system area limits as specified in NFPA 13
There are no cross-references in the Building Code between Sentences 3.2.4.9.(2) and 3.2.4.16.(1) and therefore the application of these two Sentences together can be unclear. However, Appendix reference A-3.2.4.9.(2) states that the alarm initiating devices referred to in Sentence 3.2.4.9.(2) include fire detectors, waterflow switches, and manual stations. Since waterflow switches are included, the intent is that the sprinkler system must be zoned in accordance with Sentence 3.2.4.9.(2).
Note that, for sprinkler system zoning, the requirements of Sentence 3.2.4.9.(2) differ from those of Sentence 3.2.4.16.(1) only for the relatively small proportion of buildings that have contained use areas, or impeded egress zones, or fire compartments containing patients' or residents' sleeping room in care or treatment occupancies.
This interpretation is consistent with BC Building Code Appeal Board Ruling #1624.
The Interpretation Committee will be recommending a Building Code change to clarify the relationship in the Code between Sentences 3.2.4.9.(1) and 3.2.4.16.(1).
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| 2012 |
12-0077 |
House with an Attached Storage Garage |
16/05/2017 |
AIBC, APEGBC, BOABC, POABC
File No: 12-0077 INTERPRETATION Page 1 of 1
Interpretation Date: May 16, 2017
Building Code Edition: BC Building Code 2012
Subject: House with an Attached Storage Garage
Keywords: Attached storage garage, conditioned space
Building Code Reference(s): 9.36.1.3.(5), 9.36.2.1.(2)
Question:
If an attached storage garage of a house is provided with minimal heating is it considered as a conditioned space and is subject to all requirements that apply to conditioned spaces?
Interpretation:
No (provided it is not heated over substantial portions of the year).
Section 9.36 regulates energy efficiency of Part 9 buildings. Clause 9.36.1.3.(5)(a) exempts the requirements of Section 9.36 to buildings or portions of buildings that are not conditioned spaces. Appendix A-9.36.1.3.(5) gives examples of buildings and spaces that are exempted from the requirements of Section 9.36. including storage and parking garages.
Conditioned space is defined as "any space within a building the temperature of which is controlled to limit variation in response to the exterior ambient temperature by the provision, either directly or indirectly, of heating or cooling over substantial portions of the year."
Sentence 9.36.2.1.(2) requires the components of a building envelope assembly that separate a conditioned space from an attached storage garage to comply with Subsection
9.36.2 even if the storage garage is intended to be heated. Appendix A-9.36.2.1.(2) clarifies the reason being that "even if the garage is equipped with space-heating equipment, it may in fact be kept unheated most of the time."
It is interpreted that even if an attached storage garage is heated it may be considered as unconditioned space and exempted from the requirements of Section 9.36 since the storage garage may not be heated over substantial portions of the year. It is recommended that the building code should clarify the meaning of "substantial portions of the year" for those "semi heated" spaces to promote consistency in enforcement.
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| 2012 |
12-0078 |
Spatial Separation |
17/05/2016 |
File No: 12-0078 INTERPRETATION Page 1 of 1
Interpretation Date: May 17, 2016
Building Code Edition: BC Building Code 2012
Subject: Spatial Separation
Keywords: Exposing Building Face, Fire Interconnected Floor Space Compartment,
Building Code Reference(s): 3.2.3.2, 3.2.8.2.(6)
Question:
In a double-height first storey fire compartment that could accommodate a future interconnected floor space with no change to the applicable construction requirements as permitted by Sentence 3.2.8.2.(6), can the exposing building face be considered as two separate storeys (separate fire compartments) for spatial separation purposes, while it is still a single storey with no other floor levels?
No.
Sentence 3.2.3.2.(1) requires the area of an exposing building face to be the total area of an exterior wall facing in one direction measured from finished ground level to the uppermost ceiling, except as permitted by Sentences (2) and (3). Sentence 3.2.3.2.(2) allows an exposing building face to be the exterior wall of a fire compartment, provided the fire separations have a fire-resistance rating of not less than 45 min. Where there is an interconnected floor space in a building that is sprinklered throughout, Sentence 3.2.3.2.(3) allows the exposing building face to be determined by considering each storey as a separate fire compartment notwithstanding the openings through the floor assemblies.
The exposing building face area cannot be based on a possible future interconnected storey. Where there is no additional storey, interconnected or otherwise, the exposing building face is required to be calculated for the fire compartment in accordance with Sentence 3.2.3.2.(2). In this case, the exposing building face is the applicable exterior wall area of the double-height first storey fire compartment.
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| 2012 |
12-0079 |
Sliding Doors, Clearance Beside Doors, Adaptable Dwelling Units |
16/05/2017 |
Interpretation Date: May 16, 2017
Building Code Edition: BC Building Code 2012
Subject: Accessible Doors
Keywords: Sliding Doors, Clearance Beside Doors, Adaptable Dwelling Units
Building Code Reference(s): 3.3.1.13.(10), 3.3.4.7.(1), 3.8.5.4, 3.8.5.5.(1),
9.9.6.4.(1)
Question:
1. Is a non-powered sliding door, such as a pocket door, permitted to be used for access in an adaptable dwelling unit in a Part 3 building?
2. If the answer to question 1 is yes, what clearances are required beside the latch?
3. If the answer to question 1 is yes, what type of door handle should be used for the non-powered sliding doors?
1. Yes.
Subsection 3.8.5 includes requirements for adaptable dwelling units. Sentence 3.8.5.4.(1) requires doorways providing access to common living areas and at least one bathroom and one bedroom to have a clear opening width of not less than 800 mm. Sentence 3.8.5.4.(2) requires the floor area on both sides of those doors to conform to Clause 3.3.1.13.(10)(b), which establishes requirements for clear and level areas at doors that are required for access by disabled persons. That Clause includes requirements for powered and non-powered swinging doors and for powered sliding doors, but does not refer to non-powered sliding doors.
Due to floor area constraints that would limit the door swing in many dwelling units, pocket doors that slide into a wall cavity have often been installed in the doorways of bathrooms in adaptable dwelling units. Pocket doors have also been used at other locations in dwelling units.
Non-powered sliding doors are not directly addressed in the Building Code. For Part 3 buildings, Sentence 3.3.4.7.(1) refers to Section 9.8 for requirements for stairs, ramps, landings, handrails and guards within a dwelling unit, but there is no similar cross-reference for doors within a dwelling unit. Sentence 9.9.6.4.(1) requires doors in means of egress, except doors within dwelling units, to swing on a vertical axis. Based on this provision, sliding doors are permitted within dwelling units in Part 9 buildings, and since powered sliding doors would not normally be installed in a dwelling unit, they are assumed to be non-powered sliders. Within a dwelling unit, there would be no functional difference in the use of a door whether it is in a Part 3 building or a Part 9 building. Therefore, it is interpreted that non-powered sliding doors can be used within dwelling units in Part 3 buildings.
- The BC Building Code does not have requirements for latch-side clearances for non-powered sliding doors. Additional reference information can be found in the CSA standard CSA-B651 "Accessible Design for the Built Environment". This CSA standard is also referenced in the National Building Code 2015 as an acceptable design standard.
3. The Building Code does not contain any specific requirements for handles of sliding doors in an adaptable dwelling unit. Clause 3.3.1.13.(10)(c), which requires accessible doors to be operable by devices that do not require tight grasping or twisting of the wrist as the only means of operation, is not referenced by the adaptable dwelling unit requirements of Subsection 3.8.5. Additional reference information can be found in CSA-B651 "Accessible Design for the Built Environment".
Subsection 3.8.5 of the BC Building Code 2012 contains requirements that are different from those of the National Building Code 2010. The Interpretation Committee contacted the BC Building and Safety Standards Branch and they have confirmed the intent of the applicable Subsection 3.8.5 requirements for this interpretation. The Interpretation Committee has recommended that the BC Building Code be revised to more clearly address these issues.
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| 2012 |
12-0080 |
Lateral Support of Flat Insulating Concrete Form Foundation Walls |
18/10/2016 |
File No: 12-0080 INTERPRETATION Page 1 of 1
Interpretation Date: October 18, 2016
Building Code Edition: BC Building Code 2012
Subject: Lateral Support of Flat Insulating Concrete Form Foundation Walls
Keywords: Lateral support, flat insulating concrete forms, foundation walls
Building Code Reference(s): 9.15.4.2.(3), 9.15.4.5., Tables 9.15.4.5.A, B & C
Question:
Sentence 9.15.4.2.(3) states that foundation walls that are constructed using flat insulating concrete forms must be laterally supported at the top and the bottom of the wall.
Tables 9.15.4.5.A., B & C use the term "Maximum Unsupported Basement Wall Height". Is there a conflict between Sentence 9.15.4.2.(3) and Tables 9.15.4.5.A., B & C?
Interpretation:
No
All foundation walls that are constructed using flat insulating concrete forms must be laterally supported at the top and the bottom of the wall as per Sentence 9.15.4.2.(3).
The term "Maximum Unsupported Basement Wall Height" in Tables 9.15.4.5.A., B & C means the maximum distance between the lateral supports at the top and bottom of the wall.
The portion of the foundation wall between the top and bottom lateral supports is considered to be "unsupported".
The concrete wall thickness c/w reinforcement steel described in Tables 9.15.4.5.A., B & C will safely span between the top and bottom lateral supports to resist the lateral earth pressures that are exerted on the foundation wall.
Sentence 9.15.4.3.(5) describes the acceptable methods for lateral support at the top of the wall. Sentence 9.15.4.4.(1) describes the acceptable methods for lateral support at the bottom of the wall.
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| 2012 |
12-0081 |
Safety Glass in Tub and Shower Enclosure |
18/10/2016 |
File No: 12-0081 INTERPRETATION Page 1 of 1
Interpretation Date: October 18, 2016
Building Code Edition: BC Building Code 2012
Subject: Safety Glass in Tub and Shower Enclosure
Keywords: Safety glass, Glass enclosure
Building Code Reference(s): 9.5.3.1., 9.6.1.2.(1)(a)&(g), 9.6.1.4.(6)
Question:
1. What is the extent of a shower or bathtub enclosure in Sentence 9.6.1.4.(6)?
2. Does the exterior window that forms part of a shower enclosure have to be glazed with safety glass?
3. How high must the sill of the exterior window be to avoid the requirement of safety glass?
1. The shower enclosure includes all of the walls and screens surrounding the bathtub or shower. If the entire bathroom incorporates a shower without partitions, the perimeter walls of the bathroom are considered to be the shower enclosure.
2. Yes. The inner pane of an exterior window that forms part of the shower enclosure are subject to Sentence 9.6.1.4.(6) and require safety glass as described in Clauses 9.6.1.2.(1)(a) or (g).
3. The Building Code does not provide any exemptions for safety glass in exterior windows that form part of the shower enclosure. Although it may be reasonable to permit non-safety glass where the window sill is above the minimum headroom clearance of 2.1 m as per Table 9.5.3.1.
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| 2012 |
12-0082 |
Accessible Parking Stalls for Persons with Disabilities |
18/10/2016 |
File No: 12-0082 INTERPRETATION Page 1 of 1
Interpretation Date: October 18, 2016
Building Code Edition: BC Building Code 2012
Subject: Accessible Parking Stalls for Persons With Disabilities
Keywords: Parking Stalls, Persons Accessible with Disabilities,
Building Code Reference(s): 3.8.2.3.(1), 3.8.3.4.
Question:
In buildings that do not have sleeping units that are required to be accessible, and that are not required to have accessible viewing positions, are parking stalls for persons with disabilities required when there are fewer than 50 parking stalls?Interpretation:
No.
Clause 3.8.2.3.(1)(b) requires access for disabled persons from a parking area to a building entrance, when off-street parking is provided for persons with disabilities. This Clause does not require that parking stalls be provided for persons with disabilities. It only requires access from those stalls, where the stalls are provided.
Articles 3.8.2.4 to 3.8.2.39 contain design requirements for persons with disabilities, for different types of occupancies and floor area uses. None of these Articles require parking stalls for persons with disabilities.
Parking stalls for persons with disabilities are required as stated in Article 3.8.3.4. If accessible sleeping units are provided in conformance with Article 3.8.3.14 or if accessible viewing positions are provided in conformance with Article 3.8.3.15, one parking stall for persons with disabilities is required for each such sleeping unit or viewing position. In all other occupancies, the Building Code requires parking stalls for persons with disabilities only where more than 50 parking stalls are provided, in conformance with Sentence 3.8.3.4.(2).
Individual jurisdictions may have local parking by-laws that require additional parking stalls for persons with disabilities.
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| 2012 |
12-0083 |
Bathroom Group Additional Fixture Unit Loads |
18/10/2016 |
File No: 12-0083 INTERPRETATION Page 1 of 1
Interpretation Date: October 18, 2016
Building Code Edition: BC Plumbing Code 2012
Subject: Bathroom Group Additional Fixture Unit Loads
Keywords: Bathroom Group, Fixture Units, Drainage
Building Code Reference(s): 2.4.10.2.(1), Table 2.4.9.3., 2.6.3.2.(1), Table 2.6.3.2.A
Question:
When determining the hydraulic load for a water distribution system, in regards to a bathroom group containing more than 3 fixtures, Table 2.6.3.2.A includes a footnote, (4), which permits the fixture unit load of the additional fixture(s) to be added to the bathroom group fixture unit value.
Can the above approach be utilized when determining the hydraulic load for a drainage system, also in relation to a bathroom group containing more than 3 fixtures, in accordance with Table 2.4.9.3.?
Interpretation:
No;
Table 2.4.9.3. (used for determining the fixture unit load for a drainage system), has no reference to a bathroom group which contains more than 3 fixtures, unlike Table 2.6,3.2.A (used for determining the fixture unit load on a water distribution system).
Since the requirements, and related rationale, in sizing a water distribution system are different than a drainage system, there is no direct relationship permitting the use of one Table value in another.
It is also important to keep in mind that the additional fixtures, added into the bathroom group in accordance with Table 2.6.3.2.A, are located in the same room.
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| 2012 |
12-0084 |
Dimensional Requirements for Service Stairs |
18/10/2016 |
File No: 12-0084 INTERPRETATION Page 1 of 1
Interpretation Date: October 18, 2016
Building Code Edition: BC Building Code 2012
Subject: Dimensional Requirements for Service Stairs
Keywords: Service stairs, rise, run, dimensions
Building Code Reference(s): 3.3.1.14.(1) & (2), 9.8.4.1., 9.8.4.2.
Question:
Are there any dimensional re'quirements in the BC Building Code for the rise and run of service stairs in either Part 3 or Part 9 buildings?
Interpretation:
No
Service stairs are defined as follows:
For Part 3 Buildings - stairs that serve service rooms and service spaces, and within industrial occupancies, where such stairs are intended for occasional use for servicing equipment and machinery.
For Part 9 Buildings - stairs that serve areas only used as service rooms and service spaces.
For Part 3 buildings, Sentence 3.3.1.14.(2) specifically exempts service stairs from the rise and run requirements referenced in Sentence 3.3.1.14.(1).
For Part 9 buildings, Articles 9.8.4.1. and 9.8.4.2. specifically exempts service stairs from the rise and run requirements of Table 9.8.4.1.
Refer to Worksafe BC Occupational Health and Safety Regulation for the appropriate design requirements for stairs and ladders that lead to service rooms and service spaces.
Refer to CAN/CSA-B44 for requirements for stairs serving elevator machine rooms and elevator shafts.
Refer to the BC Gas Safety Regulation and CSA B149.1 for stairs leading to service rooms that contain gas appliances.
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| 2012 |
12-0085 |
Clearance to Framing, Finishes and Cabinetry from Cooktops and Ovens |
17/10/2017 |
Interpretation Date: October 17, 2017
Building Code Edition: BC Building Code 2012
Subject: Clearance to Framing, Finishes and Cabinetry from Cooktops and Ovens
Keywords: Clearances, cooktops, ovens, framing, finishes, cabinetry, hood fans, over the range (OTR) microwaves
Building Code Reference(s): 9.10.22., CAN/CSA-B149.1 -7.32
Question:
1. For Part 9 Buildings, what are the minimum required clearances between a gas, propane or electric cooktops and ovens and any of the following:
a. Framing, finishes or cabinetry
b. Metal hood fan
C. Over the range (OTR) microwave oven
2. For Part 3 Buildings, what are the minimum required clearances between a gas, propane or electric cooktops and ovens and any of the following:
a. Framing, finishes or cabinetry
b. Metal hood fan
C. Over the ranqe (OTR) microwave oven
Interpretation:
The clearance requirements are different for Part 3 buildings and Part 9 buildings.
The clearance requirements are also different for gas & propane appliances and electric appliances.
Part 9 Buildings - natural gas and propane cooktops and ovens
As per Article 9.10.22.1., the clearance is determined as the most restrictive requirements of either the BC Gas Safety Regulation of the BC Safety Standards Act (including the reference standard CSA B-149.1) (see Attachments 1 to 4) OR Articles 9.10.22.2. and 9.10.22.3.
Vertical clearance from the top of the cooktop burners to framing, finishes and cabinets which are located directly above the cooktop or oven.
• 760 mm to combustible framing, finishes and cabinets with no hood fan or OTR microwave
• 760 mm to combustible framing, finishes and cabinets with hood fan or OTR microwave that projects less than 125 mm beyond the framing, finishes and cabinets
• 610 mm if the framing, finishes and cabinets are noncombustible
• 610 mm with a metal hood fan that projects at least 125 mm beyond the combustible framing, finishes and cabinets
• 61O mm when protected with 6 mm thick insulating millboard covered with sheet metal not less than 0.33 mm thick (refer to Attachment 2 for details of the insulating millboard)
Vertical clearance from the top of the entire cooktop surface, measured from the level of the burners, to combustible framing, finishes and cabinets which are NOT located directly above the cooktop.
" 450 mm if there is no fire protection material provided
" Vertical clearances can be reduced if fire protection material is installed on the combustible materials (refer to Attachments 3 & 4).
Horizontal side clearance from the entire cooktop surface to combustible wall framing, finishes or cabinets:
• 450 mm if there is no fire protection material provided
• Side clearances can be reduced iffire protection material is installed on the combustible materials (refer to Attachments 3 & 4).
Horizontal front clearances from cooktops and ovens to combustible materials
" No front clearance is required for gas or propane cooktops or ovens
Vertical and horizontal clearances between a gas or propane cooktop and an 'exhaust hood or an OTR microwave are based on the more restrictive recommended manufacturer's clearances for the cooktop and the OTR microwave. Refer to Attachment 1 -Article 7.33.8.
Part 9 Buildings - electric cooktops and ovens
As per Article 9.10.22.1., the clearances are determined by Articles 9.10.22.2. and 9.10.22.3.
Vertical clearance from the top of the cooktop elements to framing, finishes and cabinets
• 750 mm to combustible framing, finishes and cabinets with no hood fan or OTR microwave
" 750 mm to combustible framing, finishes and cabinets with hood fan or'OTR microwave that projects less than 125 mm beyond the framing, finishes and cabinets
.. 600 mm if the framing, finishes and cabinets are noncombustible
• 600 mm with a metal hood fan that projects at least 125 mm beyond the combustible framing, finishes and cabinets
,. 600 mm whl:'ln protected with 6 mm thick insulating millboard covered with sheet metal not less than
0.33 mm thick
Horizontal clearance to combustible wall framing, finishes or cabinets:
• 450 mm if there is no fire protection material provided
• 0 mm if there is fire protection material provided equivalent to 9.5 mm thick gypsum board
Vertical and horizontal clearances between an electric cooktop and an exhaust hood or an OTR microwave are based on the more restrictive recommended manufacturer's clearances for both the cooktop and the OTR microwave.Part 3 Buildings - natural gas and propane cooktops and ovens
The installation of gas or propane cooktops and ovens is governed by the BC Gas Safety Regulation of the BC Safety Standards Act (including the reference standard CSA B-149.1) (see Attachments 1 to 4).
Vertical clearance from the top of the cooktop appliance to combustible materials which are located directly above the cooktop or oven.
• 760 mm to combustible materials, or
• 610 mm when protected with 6 mm thick insulating millboard covered with sheet metal not less than
0.33 mm thick (refer to Attachment 2 for details of the insulating millboard)
• For a new residential range, installed in accordance with the certified clearances from combustible material as specified on the appliance rating plate.
Vertical clearance from the top of the cooktop appliance to combustible materials which are NOT located directly above the cooktop.
• The BC Gas Safety Regulation does not provide a prescriptive requirement for this condition
• For a new residential range, installed in accordance with the certified clearances from combustible material as specified on the appliance rating plate.
Horizontal side clearance from the cooktop to combustible materials
• 150 mm to back and sides, or
• For ranges certified for zero side and rear clearances, 25 nim on the back and O mm of the side with a 28 MSG (0.3 mm) thick sheet metal shield on the side walls spaced out a minimum of 6 mm, or
• For a new residential range, installed in accordance with the certified clearances from combustible material as specified on the appliance rating plate
Horizontal front clearances from cooktops and ovens to combustible materials
• No front clearance is required for gas or propane cooktops or ovens
Part 3 Buildings - electric cooktops and ovens
Installation of electric cooktops and ovens is governed by the most restrictive written manufacturer's recommendations for the cooktop, oven, hood fan and OTR microwave.
7.33 Residential-type ranges
7.33.1
A range shall not be installed in a bedroom but may be installed in a bed-sitting room, provided that it is
not required to be used for space-heating purposes.
7.33.2
A residential-type range shall be installed level. When installed on a combustible floor, it shall be set on its own legs or baffled base and shall be certified for such mounting.
7,33,3
When.a wnt connector is attached to a range, suitable provision shall be made by the lmtaller tor the protection of adjacent combustible materlal.
7,33.4
Except where permitted by Clauses 4.13.2 and 7.32,5 to 7.32,7, a residential-type range shall have the following minimum clearances from combustible materlal;
(a) above - 30 in (760 mm); and
(b) back and sides - 6 1n (150 mm),
7.33.5
A residential-type range certified for .zero side and rear clearances may be installed with zero side clearance from combustible material, prov1ded that there is a 1 in (25 mm) clearance at the back and a .28 MSC (0.3 mm) sheet metal shield on the side walls spaced out a minimum of (t25 in (6 mm). The shield shall extend from the rear wall to the front edge of the range and from 5 in (125 mm) below to 30 in (760 mm) above the cooking surface,
7.33.6
A new residential-type range shall be installed in accordance with its certified clearances from combustible
material as specified on the applfonce rating plate,
7,33.7
When the underside of the combustible m11terial above a residentJal-type range is protected with
Insulating mJJ/board at least 0.25 in (6 mm) thick covered wil.h sheet metal not less than 28 MSG
(0,3 mm), the clearance above the range as specified in Clause 733A may be reduced to 24 in (61o mm).
7.33.8
An exhaust hood, an exhaust appllance, or a combination thereof installed above a range shall be installed in accordance with ,ertlfled 1nstallation instructions for such an exhaust hood or appliance.
ATTACHMENT 2
4.13 Af>pliance clearances to combustible material 4.13.1
The clearances required in Clause 7 between an appl/ance and combustible material shall be considered the minimum without protection and shall be measured from the appliance, disregarding either the burner or any other projecting compohent.
4.13.2
The dearances to combustible material specified in Clause 7 shall not be reduced unless
(a) such reduced dearance is certified as safe by a nationally recognized certification organization acceptable to the authority having Jur/sdfct/on, and so marked on the appliance nameplate; or
(b) protection is provided for the combustible material, and such protection and such reduced clearance are In accordance with Table 4.1.
Insulating mlllboard - a factory-fabricated board formed with noncombustible materials, normally fibres, and having a thermal conductivity not exceeding
1 Btuh• in _ (o.144 )
|
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| 2012 |
12-0088 |
Mezzanines - Means of Egress |
18/04/2017 |
File No: 12-0088 INTERPRETATION Page 1 of 1
Interpretation Date: April 18, 2017
Building Code Edition: BC Building Code 2012
Subject: Mezzanines - Means of Egress
Keywords: Mezzanines, means of egress, exits
Building Code Reference(s): 3.4.2.2.(3)
Question:
Are all mezzanines required to have direct access on the same level to at least 1 exit, based on Sentence 3.4.2.2.(3) ?
Interpretation:
No.
With the exception of Sentences 3.4.2.2.(2) and (3), Sentence 3.4.2.2.(1) requires all mezzanines to have means of egress leading to exits at that level, on the same basis as other types of floor areas (areas not classified as mezzanines).
However, Sentence 3.4.2.2.(1) references 2 exceptions, as set out in Sentences (2) and (3). From this it is intended that if the conditions set out in Sentence (2) can be met, then Sentence (1) will not apply. In other words it is possible for the mezzanine not to be served by exits at the mezzanine level.
Sentence 3.4.2.2.(3) is an additional referenced exception to Sentence (1), provided the mezzanine is permitted by Sentence 3.2.8.2.(1) not to terminate at a vertical fire separation. In this case it is possible to have a mezzanine not meeting Sentence (2), served by an exit at the mezzanine level and the other means of egress provided by a stair leading to the level below.
The maximum travel distance provisions of 3.4.2.4 and 3.4.2.5 are still applicable.
This is consistent with the publication "BC Building Code 2006 An Illustrated Guide to Code Changes and changes to Vancouver Building Bylaw 2007" pp 52-53.
See also related past interpretations 12-0054 and 12-0065, and Building Code Appeal #1564.
|
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| 2012 |
12-0089 |
Anchorage of Building Frames |
24/01/2017 |
File No: 12-0089 INTERPRETATION Page 1 of 1
Interpretation Date: January 24, 2017
Building Code Edition: BC Building Code 2012
Subject: Anchorage of Building Frames
Keywords: anchorage, anchor bolts
Building Code Reference(s): 9.23.6.1.(4)(c)
Question:
Clause 9.23.6.1.(4)(c) requires that anchor bolts that are used to anchor the building frame to the concrete foundations be designed so that the anchor bolts will not withdraw from the concrete foundation wall when the bolts are tightened.
Does this means that the anchor bolts must be cast in place during the concrete pour?
Interpretation:
No
There are numerous ways to install anchor bolts that can meet the performance requirement to prevent withdrawing from the concrete foundation.
Drilling holes in the top of the concrete wall and inserting the anchor bolts in epoxy grout is an acceptable method for achieving the performance requirements, but a high level of quality control is required during the installation procedure. The anchors must be embedded at least 100 mm into the top of the concrete foundation wall, and the epoxy grout must be evenly distributed around the annular space between the anchor and the drilled hole. Strict adherence to the epoxy grout manufacturer is required.
Other acceptable methods utilize proprietary expansion anchors or adhesive anchors, provided they are embedded at least 100 mm into the top of the concrete foundation wall.
|
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| 2012 |
12-0090 |
Absorptive Material in Wall Assembly EW1 |
17/04/2018 |
File No: 12-0090 INTERPRETATION Page 1 of 1
Interpretation Date: April 17, 2018
Building Code Edition: BC Building Code 2012
Subject: Absorptive Material in Wall Assembly EW1
Keywords: Absorptive material, wall assembly
Building Code Reference(s): Table A-9.10.3.1.A; Table D-2.3.4.A; Table D-2.3.4.C; Table D-2.3.4.D; D-2.3.5.(2)
Question:
Can fibreglass insulation be used in the exterior wall assembly EW1 of Table A-9.10.3.1.A while achieving the stated fire-resistance ratings?
Interpretation:
No.
Wall assembly EW1 is the only wood stud exterior wall assembly in Table A-9.10.3.1.A. It includes a reference to footnote 6 for the absorptive material in the stud spaces. Footnote 6 states "Absorptive material for the higher fire-resistance rating is mineral fibre processed from rock or slag with a mass of at least 4.8 kg/m2 for 150 mm thickness, 2.8 kg/m2 for 89 mm thickness ....". This excludes fibreglass insulation.
The requirement of the use of mineral wool as an absorptive material is intentional as this material has superior fire resistance to glass batt insulation. This is clearly noted in Table D-2.3.4.D. where the mineral wool receives 15 min of additional time versus glass fibre insulation only 5 min. further discussed in note (1) at the bottom of the table. The exterior wall assembly in Table A-9.19.3.1.A. is generic in principal and in order to apply it, it has to be built as prescribed. ·
The reference in footnote 6 in Table A-9.10.3.1.A to "... the higher fire-resistance rating... " may cause some confusion with respect to assembly EW1 because EW1 does not have different ratings for different types of insulation, i.e., there is no higher fire-resistance rating in EW1. However, footnote 6 is also referenced from other assemblies whether the higher rating is applicable, and it is not intended to imply that other types of insulation can be used in EW1.
As a note, one may use Tables D-2.3.4.A and D-2.3.4.C to build up a loadbearing wall with the use of one layer of 5/8" Type X GWB and wood studs at 400 O.C. and achieve 1h rating with or without any insulation
|
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| 2012 |
12-0091 |
Limiting Distances for Houses in Areas with Delayed Fire Department Response |
21/03/2017 |
File No: 12-0091 INTERPRETATION Page 1 of 2
Interpretation Date: March 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Limiting Distances for Houses in Areas with Delayed Fire Department Response
Keywords: Limiting Distance, Fire Department Response
Building Code Reference(s): 3.2.3, 9.10.15.3, 9.10.15.4
Question:
In assessing spatial separation for houses, is the limiting distance required to be halved where fire department response is delayed and the building is not sprinklered, even if the requirements of Subsection 3.2.3 are used instead of the requirements of Subsection 9.10.15?
Interpretation:
Yes.
Subsection 9.10.15 regulates spatial separation for buildings that contain only non-stacked dwelling units. For these buildings, Sentence 9.10.15.3.(1) requires the limiting distance to be halved when applying the requirements of Subsection 9.10.15, where the time from fire department receipt of a fire notification, to the first fire department vehicle arriving at the building, exceeds 10 minutes in 10% or more of all calls to that building location, and any storey in the building is not sprinklered. Sentence 9.10.15.3.(1) contains an exception {included in an amendment that was effective on April 3, 2013) for Sentence 9.10.15.3.(2). Sentence 9.10.15.3.(2) contains similar requirements for halving the limiting distance.
Both Sentences 9.10.15.3.(1) and (2) include exceptions where the limiting distance is not halved, even with delayed or no fire department response, and no sprinklers. Those exceptions are for specific conditions that do not affect the limiting distance to be used with Table 9.10.15.4. If Sentences 9.10.15.3.(1) or (2) require the limiting distance to be halved, that halved distance must be used with Table 9.10.15.4.
Clause 9.·10.15.4.(1)(b) allows the option for the maximum area of glazed openings in an exposing building face to conform to Subsection 3.2.3 instead of Table 9.10.15.4. This provision does not refer to any specific Article, Sentence or Clause within Subsection 3.2.3. Therefore, all relevant requirements of Subsection 3.2.3 are applicable. Sentence 3.2.3.1.(8) contains the same requirement as Sentence 9.10.15.4.(1) for halving the limiting distance where fire department response is delayed and any storey of the building is not sprinklered. If those conditions are applicable to a single family dwelling, the limiting distance must be halved when applying the spatial separation tables of Subsection 3.2.3. |
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| 2012 |
12-0092 |
Roof Soffit Protection at Property Lines |
19/09/2017 |
File No: 12-0092 INTERPRETATION Page 1 of 1
Interpretation Date: September 19, 2017
Building Code Edition: BC Building Code 2012
Subject: Roof Soffit Protection at Property Lines
Keywords: Roof soffit protection, property lines lines, strata lot boundary
Building Code Reference(s): 9.10.15.5.(10)
Question:
For non-stacked row housing, Sentence 9.10.15.5.(10) requires that roof soffits that are located within 1.2m of a property line or the centerline of a public way have no openings and be protected with materials described in Clause (b).
Does this requirement apply to roof soffits that straddle a strata lot boundary line between 2 adjacent row houses?
No, except as noted below
A strata lot boundary line is not considered to be a "property line" for the purposes of Sentence 9.10.15.5.(10).
If the row house is located on a bare land strata, the strata boundary line between adjacent row houses would be considered to be a "property line" for the purposes of Sentence 9.10.15.5.(10).
If the row house is located on a fee simple lot, the lot line between adjacent row houses would be considered to be a "property line" for the purposes of Sentence 9.10.15.5.(10).
Refer also to the BC Building Code Appeal Board decision SCAB #1318.
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| 2012 |
12-0093 |
Potable Water Supply |
21/03/2017 |
File No: 12-0093 INTERPRETATION Page 1 of 1
Interpretation Date: March 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Potable Water Supply
Keywords: Potable Water/Piped Water Supply
Building Code Reference(s): 9.31.3.1.(1), 9.31.3.2.(1)
Question:
Is a piped water supply required to provide potable water to a dwelling unit (single family dwelling)?
Interpretation:
No,
Sentence 9.31.3.1.(1) of the British Columbia Building Code (BCBC), states that "Every dwelling unit shall be supplied with potable water."
Sentence 9.31.3.2.(1) states "Where a piped water supply is available, piping for hot and cold water shall be connected to every kitchen sink, lavatory, bathtub, shower, slop sink and laundry area."
A piped water supply may not be available to provide potable water to a dwelling unit, in some circumstances, and the BCBC would not prohibit an alternative source of potable water being utilized. It is the responsibility of the owner/applicant to provide the appropriate information as required by Division C, Part 2, Sentence 2.2.2.1.(1) showing conformance with the BCBC.
|
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| 2012 |
12-0095 |
Elevators Without an Elevator Machine Room |
19/06/2018 |
Interpretation Date: June 19, 2018
Building Code Edition: BC Building Code 2012
Subject: Elevators Without an Elevator Machine Room
Keywords: Elevators without an elevator machine room, elevat controller, integrity of elevator hoistway, protection conductors, elevator recall or
of electrical
Building Code Reference(s): 3.2.4.12., 3.2.6.5.(6), 3.2.7.10,, 3.5.3.1, 3.5.3.3
Questions:
With emerging technologies, elevators in buildings are sometimes designed without a separate elevator machine room. Instead, some installations provide elevator control by way of a testing and inspection panel which is mounted in the elevator door frame and an elevator controller which is integrated within the elevator hoistway. Since this type of installation was not contemplated when drafting the current wording of the building code, the current wording does not adequately address the potential hazards of this installation.
Integrity of Fire Separation of Elevator Hoistway
1. If an elevator controller is located within the wall assembly of an elevator hoistway, is a fire separation required between the elevator controller and the elevator lobby?
2. If an elevator controller is installed within the wall assembly of an elevator hoistway, is a fire separation required between the elevator controller and the elevator hoistway?
3. Some elevator manufacturers attach the sheet metal box that houses the elevator controller to the side of the elevator door frame. They have tested the elevator door, frame and sheet metal box in accordance with Clause 3.1.8.4.(1)(a) and CAN4-S104-M "Fire Tests of Door Assemblies", which confirms that the entire assembly provides a 90 min fire protection rating.
This test also verified that the elevator door interlock mechanism remained operational for 1 hour as required by Clause 3.2.6.5.(3)(a) as noted below.
3.2.6.5.(3) Each elevator for use by firefighters shall
a) be provided with a closure at each shaft opening so that the interlock mechanism remains mechanically engaged and electrical continuity is maintained in the interlock circuits and associated wiring for a period of not less than 1 h when the assembly is subjected to the standard fire exposure described in CAN4-S104-M, "Fire Tests of Door Assemblies,"
Is it appropriate to consider the sheet metal box that houses the elevator controller as part of the door frame, rather than part of the elevator hoistway wall?
Protection of Electrical Conductors Serving Elevators
4. Which elevators are required to have their electrical conductors protected against exposure to fire?
5. Which electrical conductors that serve elevators must be protected against exposure to fire?
6. Can the elevator hoistway be considered as a service space for the protection of electrical conductors from exposure to fire as described in Clause 3.2.6.5.(6)(a)?
7. If the electrical conductors as described in question 5 have not been tested to ULC-S139 "Fire Test for Evaluation of Integrity of Electrical Cables" as per Sentence 3.2.7.10.(2), can they be exposed within the elevator hoistway?
Elevator Recall
8. If the elevator controller is located within the elevator hoistway, are smoke detectors for elevator recall required at the location of the elevator controller as described in Clause 3.2.4.12.(1)(g) and Sentence 3.2.4.12.(4) for elevator recall?
nterpretation:
Integrity of Fire Separation of Elevator Hoistway
1. Yes.
Article 3.5.3.1 requires that an elevator hoistway be separated from all other portions of each adjacent storey, which includes the elevator lobby, with a fire separation with a fire resistance as described in Table 3.5.3.1.
Sentence 3.5.3.3.(1) requires a "room" that contains elevator machinery be separated from all parts of the building with a fire separation with a fire resistance rating that is the same as the elevator hoistway. Although the elevator hoistway, which contains the elevator controller, is not considered to be a "room", the concept to separate the elevator controller from the adjacent parts of the building is still appropriate.
2. No
Sentence 3.5.3.3.(2) waives the requirement for a fire separation between a "room" that contains elevator machinery and the elevator hoistway. Although the elevator hoistway, which contains the elevator controller, is not considered to be a "room", the concept to waive the fire separation between the elevator controller and the hoistway is still appropriate.
3. No
The CAN4-S104-M test is intended for use on door assemblies to verify the fire protection rating of the door and door frame. Including the sheet metal box that houses the elevator controller as part of the "door frame" is inappropriate, particularly when the box can be quite large and contains critical electrical components for the operation of the elevator.
As per Sentence 3.1.7.1.(1) elevator hoistway wall assemblies must be tested to CAN/ULC S101 , "Fire Endurance Tests of Building Construction and Materials" to verify their fire resistance rating. Alternatively, as per Sentence 3.1.7.1.(2) they could be designed the prescriptive requirements of Appendix D.
The CAN/ULC-S101 test for wall assemblies includes a limit on the temperature rise of the wall assembly between the fire side and the non-fire side, whereas the CAN/ULC-S104 test for doors and door frames does not include a temperature rise limitation.
Although the elevator door and door frame tested to CAN/ULC-S104 verified that the elevator door interlock mechanism remained operational for 1 hour as required by Clause 3.2.6.5.(3)(a), the test did not verify that the elevator controller itself would remain operational for 1 hour as inferred in Clause 3.2.6.5.(6)(b) for electrical conductors.
Although the current wording of the building code does not address any fire testing or operational requirements of the elevator controller when installed as part of the elevator door frame, there is an expectation that that operational requirements of the elevator controller under fire conditions are more critical than the door interlock mechanism.
In order to maintain the integrity of the fire separation of the elevator hoistway wall assembly, the portion of the hoistway wall between the sheet metal box containing the elevator controller and the elevator lobby should meet the temperature rise criteria of CAN/ULC S101.
The sketch below illustrates a conceptual approach for maintaining the integrity of the fire separation of the elevator hoistway wall assembly at the elevator controller.
FLOOR PLAN DIAGRAM AT ELEVATOR
Protection of Electrical Conductors Serving Elevators
4. The only elevators that are required to have their electrical conductors protected against exposure to fire are firefighter's elevators in high buildings as per Sentence 3.2.6.5.(6) and Sub-clause 3.2.7.10.(2)(a)(iii).
5. As described in Clause 3.2.6.5.(6)(b), the only electrical conductors that must be protected against exposure to fire are ones that serve firefighter's elevators in high buildings that lead from the "service entrance of the emergency power supply, or the normal service entrance of the normal power supply, to the equipment being served". The termination point of the
electrical conductors to the "equipment being served" is considered to be the elevator disconnect switch, which, for elevators that do not have elevator machine rooms, is usually located within the elevator controller.
All electrical conductors that are downstream of the elevator disconnect switch are considered to be branch wiring which does not need to be protected against exposure to fire.
This is clarified in Appendix A-3.2.7.10.(S)(b) as noted below:
A-3.2.7.10.(5)(b) Electrical Conductors in the Same Room. If the distribution panel and the equipment it serves are within the same room, only the electrical conductors leading up to the distribution panel need to be protected. It is assumed that the distribution panel and the equipment it serves are within sufficient proximity to each other such that a fire in the same area of origin would affect both
6. No
Clause 3.2.6.5.(6)(a) allows the electrical conductors that serve firefighter's elevators in high buildings to be located within service spaces that do not contain other combustible material.
An elevator hoistway is considered to be a vertical service space as defined in Division A Article 1.4.1.2., but since the elevator hoistway contains many combustible components, such as the elevator cab finishes, it does not meet the requirements of Clause 3.2.6.5.(6)(a) for protection of electrical conductors.
7. No
Since the elevator hoistway cannot be used to protect the electrical conductors that serve the elevator, Clause 3.2.6.5.(6)(a) does not apply.
The only other method of protecting the electrical conductors that are exposed within the elevator hoistway is Clause 3.2.6.5.(6)(b), which requires that any exposed conductors within the elevator hoistway that serve firefighter's elevators in high buildings must comply with ULC S139. The portion of electrical conductors that are exposed within the elevator hoistway that lead from the service entrance of the power supply to the elevator disconnect switch within the controller must comply with ULC-S139.
It should be noted that elevator cabs incorporate an indicator light with a firefighter's helmet. This indicate light flashes when any of the following fire alarm detection devices are actuated:
• Smoke detectors at the top of the elevator hoistway,
• Smoke detectors in the elevator machine room (not applicable for elevators without elevator machine rooms), and
• Heat detectors in the elevator pit
The purpose of the indicator light is to warn firefighters to avoid using the elevators for emergency purposes because the elevator may be compromised.
Elevator Recall
8. Yes
Clause 3.2.4.12.(1)(g) requires a smoke detector in an elevator machine room. As described in Sentence 3.2.4.12.(4), the purpose of this is for elevator recall.
Where there is no elevator machine room, this is addressed in ASME A17.1-2010/CSA B44-10
"Safety Code for elevators and Escalators", in reference 2.27.3.2.2:
In jurisdictions enforcing the NBCC, smoke detectors, or heat detectors in environments not suitable for smoke detectors (fire alarm initiating devices), used to initiate Phase I Emergency Recall Operation, shall be installed in conformance with the requirements of the NBCC, and shall be located
(a) at each floor served by the elevator
(b) in the associated elevator machine room, machinery space containing a motor controller or electric driving machine, control space, or control room.
"Control space" is defined as:
"control space, elevator, dumbwaiter, material lift: a space inside or outside the hoistway, intended to be accessed with or without full bodily entry, that contains the motor controller. This space could also contain electrical and/or mechanical equipment used directly in connection with the elevator, dumbwaiter, or material lift but not the electric driving machine or the hydraulic machine."
Since the elevator controller is usually located at the uppermost storey of the building, a smoke detector at the top of the elevator shaft is considered to meet the intent of Clause 3.2.4.12.(1)(g).
See also past interpretation 12-0007.
|
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| 2012 |
12-0096 |
Radon Gas Termination |
21/03/2012 |
Interpretation Date: March 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Radon Gas Termination
Keywords: Radon, vent pipe, termination, air inlet Building Code Reference(s): 9.13.4.3.(3)(b)(ii)
Question:
Sub-clause 9.13.4.3.(3)(b)(ii) requires that the termination of a radon vent pipe be not less than
1 m above and not less than 3.5 m in any other direction to any air inlet, door or openable window.
Does this requirement apply to an air inlet that is used to supply combustion air to a furnace?
Interpretation:
Yes
The term "any air inlet" in sub-clause 9.13.4.3.(3)(b)(ii) includes air inlets that supply fresh air to the building as well as air inlets that provide combustion air to a furnace within the building.
|
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| 2012 |
12-0097 |
Area of Exposing Building Face in a Building With Multiple Fire Compartments |
20/06/2017 |
Interpretation Date: June 20, 2017
Building Code Edition: BC Building Code 2012
Subject: Area of Exposing Building Face in a Building With Multiple Fire Compartments
Keywords: Fire Compartment, Exposing Building Face, Unprotected Openings
Building Code Reference(s): 3.2.3.2, 3.2.3.1.(5), 3.2.3.1.(6), 9.10.14.2.(1),
9.10.15.2.(1)
Question:
In a building containing fire compartments separated by fire separations that have at least 45 min. fire-resistance ratings, is it permitted to determine allowable unprotected openings based on the exposing building face area of the entire building facing in one direction, and locate all of the unprotected openings in the exposing building face of one fire compartment?
Interpretation:
Yes.
Sentence 3.2.3.2.(1) states that, except as permitted in Sentences (2) and (3), the area of an exposing building face (EBF) shall be calculated as the total area of an exterior wall facing in one direction on any side of a building measured from finished ground level to the uppermost ceiling. In Sentence 3.2.3.2.(2), the EBF area is permitted (not required) to be determined for each fire compartment, where the fire compartments are separated by fire separations with a fire-resistance rating of at least 45 min. Sentence (2) does not state a requirement. It allows an alternate method that can be used in determining the EBF area, at the designer's discretion.
Sentences 9.10.14.2.(1) and 9.10.15.2.(1) contain similar wording. The EBF area is required to be the exterior wall area facing in one direction. This is calculated as either the total area from finished ground level to the uppermost ceiling, or calculated as the exterior wall area for each fire compartment where a building is divided into fire compartments by fire separations with fire-resistance ratings of at least 45 min. (Sentence 9.10.15.2.(1) also contains another option for houses, which is not relevant to the question.) These Part 9 requirements do not clearly state that either option can be used to
determine the EBF area in a building with multiple fire compartments. However, based on the similar Part 3 requirements, it is interpreted that, in a building with multiple fire compartments, the designer can choose whether to determine the EBF area using an entire face of the building, or the face of each fire compartment.
Sprinklering of a building does not affect application of these provisions to determine the EBF area. The requirements are the same for sprinklered and unsprinklered buildings.
Using an entire face of the building as the EBF will in most cases permit a smaller percentage of unprotected openings than if the EBF of each fire compartment is considered. The designer could choose to concentrate these allowable openings in only one area or one fire compartment of the building face, subject to the requirements of Sentenc s 3.2.3.1.(5) and (6) for size and proximity of individual openings which are applicable if the limiting distance is 2 m or less and the building is unsprinklered. Part 9 has similar limitations on opening sizes and proximity, in Sentences 9.10.14.4.(3) and (4) and (for houses) in Articles 9.10.15.2 and 9.10.15.4.
If this approach is followed, with all of the allowable openings for an EBF concentrated at one fire compartment, the exterior walls of other fire compartments facing in that direction would not be. permitted any unprotected openings.
If the floor areas at an EBF have fire compartments with different occupancy classifications, and an entire building face is used as the EBF, the most restrictive occupancy classification must be used to determine the allowable unprotected openings. For example, in a two storey building where the first storey contains a Group E occupancy and the second storey contains a Group A, B, C, D or F3 occupancy, if an entire building face is used as the EBF the allowable openings must be determined on the basis of a Group E occupancy.
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| 2012 |
12-0101 |
Electrical Outlet Boxes in Fire Separations |
20/03/2018 |
Interpretation Date: March 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Electrical Outlet Boxes in Fire Separations
Keywords: Fire Separation, Penetrations, Outlet Boxes
Building Code Reference(s): 3.1.9.1.(1), 3.1.9.2.(1), 3.1.9.3., 3.1.9.3.(6)
Questions:
Where electrical outlet boxes are located in a fire separation that is required to have a fire resistance rating:
1. Is firestopping required for noncombustible electrical outlet boxes of any size, where the boxes are tightly fitted?
2. Is firestopping required for combustible electrical outlet boxes that comply with the size restrictions of Sentence 3.1.9.3.(5), where the boxes are tightly fitted?
3. If firestopping is provided for electrical outlet boxes, is it still necessary to offset electrical boxes that penetrate opposite sides of the wall assembly?
Interpretation:
1. No, but other measures may be necessary for large outlet boxes.
Sentence 3.1.9.1.(1) requires that penetrations of fire-rated fire separations be (a) sealed by an acceptable fire stop, or (b) cast in place, or (c) tightly fitted. The allowance for tightly fitted penetrations is a unique-to-BC provision that is not part of the National Building Code. There is no definition of "tightly fitted". The reference to Clause 3.1.9.1.(1)(c) in Division B - Part 3 Appendix A (April 2013 revision) states that there are to be no substantial gaps between the building service or penetrating item and the membrane or assembly it penetrates
The National Building Code 2015 contains a new Article 3.1.9.4 "Penetrations by Outlet Boxes", which is expected to be adopted as part of the BC Building Code 2018. This new Article states that the maximum allowable annular space between the membrane and a noncombustible outlet box is 3 mm. This requirement is not part of the BC Building Code 2012, but it may be referenced for guidance for the installation of noncombustible outlet boxes, subject to agreement by the authority having jurisdiction.
The requirements are not intended to allow large boxes of any size to penetrate fire separations. Sentence 3.1.9.2.(1) requires that services, including electrical outlet boxes, that penetrate an assembly required to have fire-resistance rating must be noncombustible unless the assembly is tested incorporating the services, except as permitted by Articles
3.1.9.3 and 3.1.9.4. Further explanation in Division B - Part 3 Appendix A states that "the provisions dealing with outlet boxes assume size, quantities and concentrations of partial depth penetrations that would not significantly affect the fire resistance of the assembly". This Appendix note further states that Sentence 3.1.9.2.(1) is not intended to allow large electrical distribution and control boxes to be recessed into an assembly that requires a fire-resistance rating unless the boxes were incorporated into the assembly when it was fire-tested.
Article 3.1.9.3 allows penetration of fire separations by wires, cables and outlet boxes, subject to the criteria noted in that Article. It is important to note that these penetrations must comply with the firestopping requirements of Article 3.1.9.1.
2. No.
Combustible outlet boxes are subject to the same "tightly fitted" requirements as noncombustible boxes, as described in item 1 above. If the opening in the membrane is larger than 0.016 m2 (24.8 sq.in.) as stated in Sentence 3.1.9.3.(5), a combustible outlet box is not permitted unless it was incorporated into the fire-rated assembly at the time of fire testing. Note that this area limit refers to the opening in the membrane at the box, not to the box size, and the membrane opening is typically larger than the box.
3. Yes, unless other compensating measures are taken.
Putty pads listed by a recognized testing agency, which are produced by one of several different firestopping manufacturers, can be molded around the electrical outlet box.
Sentence 3.1.9.3.(6) requires outlet boxes that penetrate opposite sides of a wall assembly to be offset where necessary to maintain the integrity of the fire separation. Where putty pads that are listed for the purpose of covering the outlet box are installed in accordance with the listing requirements, they are considered to maintain the integrity of the fire separation without any offset.
Other compensating measures may be acceptable subject to agreement by the authority having jurisdiction.
The BC Building Code 2012 does not provide any criteria for the required offset distance. The National Building Code 2015, which will form the basis for the BC Building Code 2018, requires that outlet boxes on opposite sides of a vertical fire separation shall be separated by a horizontal distance of at least 600 mm, or that a fire block conforming to Article
3.1.11.7 (of the NBC 2015) be provided. These requirements can be used as a guideline until the BC Building Code 2018 is adopted.
Sentence 3.1.9.3.(6) deals only with the integrity of the fire separation. The proximity of outlet boxes on opposite sides of a fire separation may also affect the required STC rating between a dwelling unit and the remainder of the building. The National Research Council publication "Best Practice Guide on Fire Stops and Fire Blocks and Their Impact on Sound Transmission" recommends that outlet boxes on opposite sides of a vertical fire separation be offset horizontally by at least one full stud space.
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| 2012 |
12-0102 |
Grade |
19/09/2017 |
Interpretation Date: September 19, 2017
Building Code Edition: BC Building Code 2012
Subject: Grade
Keywords: Grade, lowest of the Average Levels
Building Code Reference(s): Div. A - 1.4.1.2. - def'n of grade and first storey
Question:
Is grade established as the average exterior grade on all 4 sides of a building?
Interpretation:
No
Grade is defined in the BC Building Code as follows:
Grade means the lowest of the average levels of finished ground adjoining each exterior wall of a building, except that localized depressions need not be considered in the determination of average levels of finished ground.
When calculating grade for a simple rectangular building, you take the average level of finished ground adjacent at each of the 4 sides of the building. Then you take the "lowest" of these 4 levels to be "grade".
In other words, grade is the average level of finished ground adjoining the exterior wall on the "lowest" side of the building.
It should be noted that local governments may have different methods of calculating grade and building height based on their local zoning bylaws for the purposes of development permits.
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| 2012 |
12-0103 |
Bunk Bed vs Mezzanine |
19/09/2017 |
File No: 12-0103 INTERPRETATION · Page 1 of 4
Interpretation Date: September 19, 2017
Building Code Edition: BC Building Code 2012
Subject: Bunk Bed vs Mezzanine
Keywords: Mezzanine, intermediate floor assembly
Building Code Reference(s): 1.4.1.2., 9.5.3.1., 9.5.3.2., 9.8
Question:
Is a built-in bunk bed constructed of wood frame that is attached to and supported by the building structure in a bedroom considered as a mezzanine?
Interpretation:
Yes
Mezzanine is defined as an intermediate floor assembly between the floor and ceiling of any room or storey and includes an interior balcony.
A portable and free-standing bunk bed is considered as furniture and not a mezzanine. This has been confirmed by BC Building Code Appeal BCAB#1782.
Any framing that attached to and supported by the building structure and creates a floor assembly between the floor and the ceiling should be considered as mezzanine (see attached pictures).
Such mezzanine shall comply with all applicable requirements in the building code including but not limited to headroom, guard and access stair.
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| 2012 |
12-0104 |
Continuity of Fire Separation at Intersections Between Wood Frame Assemblies |
20/11/2018 |
Interpretation Date: November 20, 2018
Building Code Edition: BC Building Code 2012
Continuity of Fire Separation at Intersections Between
Subject: Wood Frame Assemblies
Keywords: Fire separations, intersections, continuity
9.10.9.2.(3)., 9.10.16.3.(1), 3.1.8.3.(4)., 3.1.11.7., Appendix
Building Code Reference(s): A-3.1.8.3.(4)., Appendix D-2.3.4., Appendix Table D-2.3.12.,
Interpretation 06-00148 item 2.
Question:
1. Is 38 mm thick wood blocking suitable for maintaining the continuity of the fire separation at the intersection of wood frame assemblies where the 2 assemblies are constructed as fire separations with equal fire resistance ratings?
2. Is 38 mm thick wood blocking suitable for maintaining the continuity of the fire separation at the intersection between a fire rated wall assembly and a non-fire rated floor assembly?
3. Is 38 mm thick wood blocking suitable for maintaining the continuity of the fire separation at the intersection between a fire rated wall assembly and a non-fire rated wall assembly?
Interpretation:
1. Yes.
Sentences 9.10.9.2.(3). and 3.1.8.3.(4). require that continuity of the fire separation be maintained where it abuts another fire separation, a floor, a ceiling, a roof or an exterior wall assembly. These sentences reference Appendix A-3.1.8.3.(4) which requires filling all openings at the intersection of assemblies with material that will ensure the integrity of the fire separation at that location.
The Best Practice Guide on Fire Stops and Fire Blocks and their Impact on Sound Transmission (NRCC-49677) provides details of intersection of wood frame assemblies and indicates that wood fire blocking is suitable for maintaining the fire separation.
See Figures 13.D.1 and 13.E.1. from the NRCC-49677 on Page 2.
2. Yes - provided enough blocking is installed
Where a fire rated wall intersects a non-fire rated floor assembly, the continuity of the wall fire separation can be maintained using multiple layers of wood blocking as shown in the Figure 5.18 below from the document "Fire Safety Design in Buildings" by the Canadian Wood Council.
Alternatively, a single layer of wood blocking in combination with drywall can also maintain the required continuity within the joist space as shown in Figure 13.D.3 from the NRCC- 49677 on Page 4.
3. Yes - provided enough blocking is provided
Where a non-fire rated wall intersects a fire rated wall, the continuity of the wall fire separation can be maintained using multiple layers of wood blocking as shown in the diagram below
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| 2012 |
12-0105 |
Occupancy Classification |
20/03/2018 |
Interpretation Date: March 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Occupancy Classification
Occupancy Classification, Treatment Occupancy, Care Occupancy, Residential
Keywords: Occupancy, Business and Personal Services
Occupancy
Building Code Reference(s): Division A, 1.4.1.2, A-3.1.2.1.(1)
Question:
What is the occupancy classification of a sleep disorder clinic that provides supervised sleeping
accommodation?
Interpretation:
Group D, with additional qualifications.
For this interpretation, a sleep disorder clinic is understood to be a facility where clients are provided
with sleeping accommodation to allow trained medical staff to observe and monitor the clients for the
entire time they sleep. Clients do not receive any services or treatment that would render them
incapable of self-preservation.
This interpretation considers several occupancy classifications, using the Building Code definitions in
Division A, Article 1.4.1.2.
Group B, Division 2
Treatment occupancy means the occupancy or use of a building or part thereof for the
provision of treatment, and where overnight accommodation is available to facilitate the
treatment. Treatment means the provision of medical or other health-related intervention to
persons, where the administration or lack of administration of these interventions may render
them incapable of evacuating to a safe location without the assistance of another person.
Group B, Division 3
Care occupancy means the occupancy or use of a building or part thereof where care is provided to residents. Care means the provision of services other than treatment by or through care facility management to residents who require these services because of cognitive, physical or behavioural limitations.
Group C
Residential occupancy means the occupancy or use of a building or part thereof by persons for whom sleeping accommodation is provided but who are not harboured for the purpose of receiving care or treatment and are not involuntarily detained.
Group D
Business and personal services occupancy means the occupancy or use of a building or part thereof for the transaction of business or the rendering or receiving of professional or personal services.
It is understood that the type of services provided to clients of a sleep clinic does not meet the definitions of "treatment" or "care", so the occupancy classification is not Group B, Division 2 or 3.
Sleeping accommodation is provided, but it is not traditional residential style accommodation. The purpose of the sleeping accommodation is to allow clinical evaluation by medical staff. It is interpreted that this arrangement is not a Group C occupancy.
The sleep clinic clients receive services provided by medical staff, similar to services provided by other types of medical offices. Division B -Appendix A, A-3.1.2.1.(1) lists medical offices as one of the examples of a Group D occupancy. However, a typical medical office does not include clients who sleep overnight at the office. The closest occupancy classification for a sleep disorder clinic is Group D, but the clinic arrangement should be evaluated based on its specific circumstances. Additional features not normally required for a Group D occupancy may be appropriate, such as smoke alarms.
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| 2012 |
12-0105 |
Occupancy Classification |
20/03/2018 |
Interpretation Date: March 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Occupancy Classification
Occupancy Classification, Treatment Occupancy, Care Occupancy, Residential
Keywords: Occupancy, Business and Personal Services
Occupancy
Building Code Reference(s): Division A, 1.4.1.2, A-3.1.2.1.(1)
Question:
What is the occupancy classification of a sleep disorder clinic that provides supervised sleeping
accommodation?
Group D, with additional qualifications.
For this interpretation, a sleep disorder clinic is understood to be a facility where clients are provided
with sleeping accommodation to allow trained medical staff to observe and monitor the clients for the
entire time they sleep. Clients do not receive any services or treatment that would render them
incapable of self-preservation.
This interpretation considers several occupancy classifications, using the Building Code definitions in
Division A, Article 1.4.1.2.
Group B, Division 2
Treatment occupancy means the occupancy or use of a building or part thereof for the
provision of treatment, and where overnight accommodation is available to facilitate the
treatment. Treatment means the provision of medical or other health-related intervention to
persons, where the administration or lack of administration of these interventions may render
them incapable of evacuating to a safe location without the assistance of another person.
Group B, Division 3
Care occupancy means the occupancy or use of a building or part thereof where care is provided to residents. Care means the provision of services other than treatment by or through care facility management to residents who require these services because of cognitive, physical or behavioural limitations.
Group C
Residential occupancy means the occupancy or use of a building or part thereof by persons for whom sleeping accommodation is provided but who are not harboured for the purpose of receiving care or treatment and are not involuntarily detained.
Group D
Business and personal services occupancy means the occupancy or use of a building or part thereof for the transaction of business or the rendering or receiving of professional or personal services.
It is understood that the type of services provided to clients of a sleep clinic does not meet the definitions of "treatment" or "care", so the occupancy classification is not Group B, Division 2 or 3.
Sleeping accommodation is provided, but it is not traditional residential style accommodation. The purpose of the sleeping accommodation is to allow clinical evaluation by medical staff. It is interpreted that this arrangement is not a Group C occupancy.
The sleep clinic clients receive services provided by medical staff, similar to services provided by other types of medical offices. Division B -Appendix A, A-3.1.2.1.(1) lists medical offices as one of the examples of a Group D occupancy. However, a typical medical office does not include clients who sleep overnight at the office. The closest occupancy classification for a sleep disorder clinic is Group D, but the clinic arrangement should be evaluated based on its specific circumstances. Additional features not normally required for a Group D occupancy may be appropriate, such as smoke alarms
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| 2012 |
12-0106 |
Foamed Plastic Insulation in Exterior Walls |
21/11/2017 |
Interpretation Date: November 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Foamed Plastic Insulation in Exterior Walls
Keywords: foamed plastic insulation, protection, exposing face building
Building Code Reference(s): 3.2.3.8., 3.1.4.2., 3.1.5.5., 3.1.5.12.
Question:
1. If the maximum permitted area of unprotected openings in Table 3.2.3.7. is not more than 10%, is foamed plastic insulation permitted in such exposing building face?
2. If the maximum permitted area of unprotected openings in Table 3.2.3.7. is more than 10%, but less than 100%, is foamed plastic insulation permitted in such exposing building face?
3. If the maximum permitted area of unprotected openings in Table 3.2.3.7. is 100%, is foamed plastic insulation permitted in such exposing building face?
Interpretation:
1. No
Table 3.2.3.7. requires that the entire exterior wall assembly be constructed with non-combustible construction. There are no exceptions in Articles 3.2.3.7. or 3.2.3.8. that would permit the use of foamed plastic insulation when the maximum permitted area of unprotected openings is not more than 10%. This applies to buildings that are permitted to be combustible construction as well as to buildings that are required to be non-combustible construction.
2. Yes - with conditions
For Buildings not more than 3 storeys in building height
Sentence 3.2.3.8.(1) permits the use of foamed plastic insulation in an exposing building face where the maximum permitted area of unprotected openings is more than 10% in buildings that are not more than 3 storeys in building height. There are no additional requirements to protect the exterior building face.
For buildings that are permitted to be combustible construction, the requirements of Article 3.1.4.2. would apply to protect the interior adjacent spaces from the foamed plastic insulation
For buildings that are required to be non-combustible construction, the following conditions apply:
• the requirements of Article 3.1.5.12. would apply to protect the interior adjacent spaces from the foamed plastic insulation, and
• if the foamed plastic insulation is part of the cladding in an "exterior non-loadbearing wall assembly that includes a combustible cladding system", the requirements of Article 3.1.5.5. would apply to protect the exterior surface of the exposing building face from propagating a fire up the exterior surface of the exterior wall. This includes testing the entire exterior wall assembly to CAN/ULC S134. Note that the building must be sprinklered throughout.
For Buildings more than 3 storeys in building height
Sentence 3.2.3.8.(1) permits the use of foamed plastic insulation in an exposing building face where the maximum permitted area of unprotected openings is more than 10% with the following conditions:
• the foamed plastic must be protected on the exterior surface with any one of the following:
o concrete or masonry not less than 25 mm thick, or
o non-combustible material that is tested to remain in place for 15 minutes when tested to CAN/ULC-S101. The testing criteria must also include the requirements of Sentence 3.2.3.8.(2), or
o a combustible cladding system of an exterior non-loadbearing wall assembly that complies with Article 3.1.5.5., which includes testing of the entire exterior wall assembly to CAN/ULC-S134. Note that the building must be sprinklered throughout.
For buildings that are permitted to be combustible construction, the requirements of Article 3.1.4.2. would also apply to protect the interior adjacent spaces from the foamed plastic insulation.
For buildings that are required to be non-combustible construction, the following conditions would also apply:
• the requirements of Article 3.1.5.12. would apply to protect the interior adjacent spaces from the foamed plastic insulation, and
• if the foamed plastic insulation is part of the cladding in an "exterior non-loadbearing wall assembly that includes a combustible cladding system", the requirements of Article 3.1.5.5. would apply to protect the exterior surface of the exposing building face from propagating a fire up the exterior surface of the exterior wall. This includes testing the entire exterior wall assembly to CAN/ULC S134. Note that the building must be sprinklered throughout.
3. Yes - with conditions
Since Sentence 3.2.3.8.(1) applies to all exposing building faces where the maximum permitted area of unprotected openings is more than 10% (including 100% maximum unprotected openings), the conditions described in Item 2 above apply. Note that Table 3.2.3.7. only addresses exposing building faces that are permitted less than 100% unprotected openings.
Refer also to the BC Building Code Appeal Board decision BCAB #1683
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| 2012 |
12-0107 |
Shower Drains |
20/03/2018 |
File No: 12-0107 INTERPRETATION Page 1 of 1
Interpretation Date: March 20, 2018
Building Code Edition: BC Plumbing Code 2012
Subject: Shower Drains
Keywords: Shower Drain, Size, Drainage, Shower Heads
Building Code Reference(s): 2.4.9.3.(1); Table 2.4.9.3.
Question:
What is the minimum required size of the fixture outlet pipe that serves a shower equipped with multiple shower heads?
Interpretation:
Sentence 2.4.9.3.(1) requires that the size of every fixture outlet pipe conform to Table 2.4.9.3. This Table requires a minimum fixture outlet pipe size of 2 inch where the shower drain receives the discharge from 2 or 3 heads for example (the corresponding load would be 3 fixture units). This means that both or all three, heads would be flowing simultaneously.
It is also important that the manufacturer's installation instructions be consulted, if provided, when installing multiple head shower valves for their recommended drain sizing.
The Committee has considered that this long standing plumbing code requirement was most likely envisioned to apply to gang shower type installations, normally found in assembly occupancies (i.e. - change rooms serving fitness facilities or aquatic centres). Plumbing industry advances have
led to multiple head installations, which are supplied by a single control valve, installed in residential
_applications. It is suggested that some judgment should be applied by the local authority having jurisdiction in the sizing of the shower drains in the single shower, residential type situation, perhaps utilizing the above mentioned manufacturer's recommended drain sizing methods if available. It is possible that the manufacturer's recommendations could exceed the requirements of the BC Plumbing Code and, if this is the case, should still be followed.
The above issue will be forwarded by the Committee to the Building and Safety Standards Branch for their information and consideration in advancing a plumbing code amendment.
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| 2012 |
12-0108 |
Standpipe Hose Connections at Horizontal Exits |
21/11/2017 |
File No: 12-0108 INTERPRETATION Page 1 of 1
Interpretation Date: November 21, 2017
Building Code Edition: BC Building Code 2012
Subject: Standpipe Hose Connections at Horizontal Exits
Keywords: Hose Connections, Exit, Horizontal Exit, Firewall
Building Code Reference(s): 3.2.5.8.; 3.2.5.9.(1); 3.2.5.10.(1); 3.2.5.10.(2); NFPA 14-2010
Question:
1. In a building that is required to have a standpipe system in accordance with Article 3.2.5.8., are hose connections required on each side of a firewall that provides required horizontal exits?
2. In a sprinklered building, are the standpipes supplying the hose connections required to be protected by a degree of fire resistance equal to that required for enclosed exit stairways in the building in which they are located?
Interpretation:
1. Yes.
Sentence 3.2.5.10.(1) requires hose connections in exits in accordance with NFPA 14-2010, "Installation of Standpipe and Hose Systems". Sentence 3.2.5.10.(2) states "Hose connections are not required within a floor area". Floor area means "the space on any storey of a building between the exterior walls and required firewalls, including the space occupied by interior walls and partitions, but not including exits, vertical service spaces, and their enclosing assemblies". As stated in Building Code Appeal Board (BCAB) decision #1702, "Each floor area is considered an exit for the adjacent floor area, therefore the hose connections adjacent to the horizontal exit are "in" an exit facility".
NFPA 14-2010 also requires hose connections on each side of the wall adjacent to the openings of horizontal exits referenced by Sentence 7.3.2.(2). The Committee is aware that there may be some changes in the 2016 edition of NFPA 14 which may relax the foregoing, however, the current edition of NFPA 14 referenced by the 2012 BC Building Code does not contain this allowance.
The above interpretation is consistent with BCAB decisions #1702 and #1645.
2. No.
The hose connections are located in an area that is considered to be protected appropriately, by the fire suppression system and the firewall, and provides a staging point for the local fire department per NFPA 14-2010.
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| 2012 |
12-0109 |
Continuity of Vertical Fire Separation between Suites |
20/03/2018 |
Interpretation Date: March 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Continuity of Vertical Fire Separation between Suites
Keywords: Vertical fire separation, continuity, suites separation, concealed space
Building Code Reference(s): 3.1.8.1.(1), 3.1.8.3.(1), (2), and (4), 3.1.7.3.(1), 3.3.1.1.,
3.1.9.1.(3).
Question:
1. For a 1 storey building containing multiple tenants, must a vertical fire separation having a fire resistance rating, between suites be continuous through to the underside of the roof deck?
2. Can this vertical fire separation terminate at a fire rated ceiling located at the underside of the roof trusses supporting the roof deck?
Interpretation:
1. Yes.
Clause 3.1.8.1.(1)(a) indicates that any wall or partition required to be a fire separation must be constructed as a continuous element (except for acceptable closures, shafts, and penetrations), and have the required fire resistance rating.
Sentence 3.1.8.3.(4) requires that the continuity of a fire separation must be maintained where it abuts a roof. This is done by filling all openings at the juncture of the assemblies with a material that will ensure the integrity of the fire separation at that location.
Sentence 3.1.8.3.(1) requires that except as permitted by Sentence 3.6.4.2.(2), a horizontal service space or other such concealed space above a required vertical fire separation must be continuous at such service space. Sentence 3.1.8.3.(2) further requires a smoke tight termination at the underside of the roof deck.
2. Yes.
The vertical fire separation is permitted to terminate at a fire rated ceiling located at the underside of the roof trusses, provided the construction between the concealed space and the space below is a fire separation equal to the vertical fire separation immediately below.
Sentence 3.1.8.3.(1) requires that a concealed space located above a vertical fire separation shall be divided at the line of the vertical fire separation by an equivalent fire separation within the concealed space. The exception to this is Sentence 3.6.4.2.(2), which indicates that the concealed space need not be divided vertically in this way provided the construction between the concealed space and the space below is a fire separation equal to the vertical fire separation.
Sentence 3.1.7.3.(1) further indicates that floor, roof and ceiling assemblies are to be rated for exposure to fire on the underside.
Sentence 3.1.8.3.(2) further requires that the vertical fire separation required in Sentence 3.1.8.3.(1) terminate so that smoke tight joints are provided where it abuts on or intersects a floor, roof slab, or roof deck. Although not expressed, it is implicit that this also applies to the termination of the vertical fire separation at the underside of the horizontal fire separation required by the Sentence 3.6.4.2.(2) exception.
Note that Sentence 3.1.9.1.(3) requires an FT rated firestop system for any services penetrations of the horizontal fire separation thus permitted.
See also past Building Code interpretation 98-0009.
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| 2012 |
12-0110 |
Maximum Ground Snow Loads for Design to Part 9 |
16/01/2018 |
File No: 12-0110 INTERPRETATION Page 1 of 2
Interpretation Date: January 16, 2018
Building Code Edition: BC Building Code 2012
Subject: Maximum Ground Snow Loads for Design to Part 9
Keywords: ground snow load, Part 9, maximum
Building Code Reference(s): 1.1.3.1.(1), A-3.1.1.3.(1), 9.4.1.1.(3), 9.4.2.1., 9.4.2.2.,
9.23.4.2.(1)
Question:
Sub-clause 2.2.7.1.(1)(c)(i) of Division C requires that a registered professional is required for the design and field review of structural components that are not within the scope of Part 9 of Division B.
Does Part 9 provide a maximum ground snow load that can be used for Part 9 buildings?
Interpretation:
Yes (for some structural members)
Sentences 9.4.1.1.(3) and 9.4.2.2.(1) require that location-specific snow loads be based on Subsection 1.1.3. of Division B.
Sentence 1.1.3.1.(1) requires that climatic data (including snow loads) be determined in accordance with Table C-2 in Appendix C of Division B.
Appendix A-3.1.1.3.(1) of Division B refers designers to Meteorological Service of Canada for snow loads in municipalities that are not included in Table C-2 in Appendix C of Division B.
Article 9.4.2.1. describes the limitations for light frame construction when designing to the prescriptive requirements of Part 9. These limitations include a maximum 2.4 kPa live load floor framing, and a maximum span of 12.2m for all structural members. This Article does not limit the ground snow loads for Part 9 buildings.
Article 9.4.2.2. describes the "specified snow loads (Sr (i.e. roof snow load) as S = CbSs + Sr, where Ss is the ground snow load.
Sentence 9.23.4.2.(1) permits the use of Tables A-1 to A-7 for maximum spans for wood frame construction for joists, rafters and beams, when the live loads do not exceed that values listed in the Tables.
Tables A-5 and A-7 limit the maximum "Specified roof snow load" to be 3.0 kPa for wood roof joists and wood roof rafters.
Table A-12 limits the maximum "Specified roof snow load" to be 3.0 kPa for wood ridge beams and lintels.
Tables A-13 and A-14 limit the maximum "Specified roof snow load (S)" to be 3.0 kPa for wood lintels.
The corresponding maximum Part 9 "ground snow load (Ss)", would vary from municipality to municipality depending upon the location specific rain load (Sr) using the formula in Article 9.4.2.2.
For example, if the rain load were 0.4 kPa, and the width of the roof does not exceed 4.3 meters, then the maximum ground snow load (Ss) would be calculated as follows:
S = CbSs + Sr
3.0 kPa = 0.45 (Ss) + 0.4 kPa
Ss = (3.0- 0.4) /0.45 = 5.78 kPa
So the maximum ground snow load would vary from municipality to municipality, but the specified roof snow load would remain constant at 3.0 kPa.
Note that this limitation only applies to the structural members noted above in Tables A-5, A-7, A-12 to A-14.
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| 2012 |
12-0113 |
Construction of Building Over Property Line |
17/04/2018 |
File No: 12-0113 INTERPRETATION Page 1 of 1
Interpretation Date: April 17, 2018
Building Code Edition: BC Building Code 2012
Subject: Construction of Building Over Property Line
Keywords: Property Line
Building Code Reference(s): Division B, Appendix A-3.2.3.4.(1)
Question:
Is it permitted to construct a building over a Property Line?
Yes (with condition).
As per the Division B, Appendix A-3.2.3.4.(1) "When a building spans a property line, constructing a party wall on the property line is not mandated by the Code, but subdividing the building at the property line is an option the owner can consider. The Code permits a building constructed on more than one property to be designed as a single undivided building, whether the properties have a common owner or not. However, if a subdividing wall is constructed on the property line within the building for the purpose of separating the two real estate entities and is shared by two different owners the wall would, by definition, be deemed a party wall. As such, this party wall would need to meet the construction requirements described above [see Appendix full text] depending on the building's occupancy classification and size.
A building that spans two or more properties, but that does not have a party wall at the property line, may need to address the Code requirements for party walls in the future."
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| 2012 |
12-0114 |
Insulation of Exhaust Ducts |
15/05/2018 |
Interpretation Date: May 15, 2018
Building Code Edition: BC Building Code 2012
Subject: Insulation of Exhaust Ducts
Keywords: Exhaust Duct, Conditioned Space, Insulation
Building Code Reference(s): 9.32.3.8.(4), 9.36.2.4.(2), 9.36.2.5.(6)
Question:
Where exhaust ducts such as from bathrooms or dryers are located in floor assemblies, and the floor assembly is adjacent to a space that is not conditioned, do the exhaust ducts require insulation?
Interpretation:
Yes, except where there is other insulation meeting the requirement, between the duct and the unconditioned space.
Sentence 9.32.3.8.(4) requires an exhaust duct that passes through or is located adjacent to a space that is not conditioned space to conform to Article 9.32.3.2, which states design and installation requirements that are not relevant to this question, but also that the duct must be insulated to not less than RSI 0.75 (R 4.25).
Conditioned space is defined as "any space within a building the temperature of which is controlled to limit variation in response to the exterior ambient temperature by the provision, either directly or indirectly, of heating or cooling over substantial portions of the year." Sentence 9.32.3.8.(4) is mainly intended to reduce the possibility of condensation inside the duct, where an exhaust duct containing warm air from a conditioned space passes through a cooler space.
A floor or ceiling assembly within a heated building is typically insulated at the exterior walls to limit heat loss, and is not insulated from adjacent heated floor areas, so the floor assembly is conditioned space. Where the duct is in a floor or ceiling assembly and the insulation on the cold side of the duct is at least RSI 0.75, the duct does not require additional insulation. If the duct passes through a ceiling space that is not conditioned such as over an unheated garage where the duct is below the insulation in the ceiling space, or an unheated attic, the duct requires insulation.
'29 hv1
Sentence 9.36.2.5.(6) contains additional insulation requirements for ducts that are within and parallel to a wall assembly that is required to be insulated. However, the Appendix note A-9.36.2.5.(6) states that those requirements are not applicable to components that completely penetrate the building envelope, such as intake or exhaust ducts. In addition, Sentence 9.36.2.4.(2) states that duct penetrations of a building envelope need not be taken into account in the calculation of the effective thermal resistance of that assembly. Therefore, the insulation of an exhaust duct that penetrates the exterior wall is governed by Sentence 9.32.3.8.(4). Where the duct penetrates an insulated exterior wall so that only the end of the duct is exposed to the unconditioned space (the exterior), the duct does not require additional insulation. The duct should be installed with a slope to the exterior to allow any condensation to drain.
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| 2012 |
12-0115 |
Elevator Shafts within a Single Dwelling Unit |
15/05/2018 |
File No: 12-0115 INTERPRETATION Page 1 of 1
Interpretation Date: May 15, 2018
Building Code Edition: BC Building Code 2012
Subject: Elevator Shafts within a Single Dwelling Unit
Keywords: Elevator, shafts, fire resistance rating
Building Code Reference(s): 9.10.1.3.(1), (6) and (7)
Question:
If an elevator that is located within a single dwelling unit that meets the requirements of Part 9, are the elevator hoistway walls required to be constructed as fire separations with a fire resistance rating.
No
Article 9.10.1.3. describes items within a Part 9 building that fall under the jurisdiction of Part 3.
• Sentence 9.10.1.3.(1) states that elevators shall conform to Part 3.
• Sentence 9.10.1.3.(6) states that openings through floors that are not protected by shafts or closures shall be protected in conformance with Subsection 3.2.8.
• Sentence 9.10.1.3.(7) states that shafts (including elevator shafts) shall conform to Subsection 3.6.3., except where they are entirely contained within a dwelling unit. This waives the requirement for the elevator shaft walls in a Part 9 building to be constructed as fire separations with a 45 minute fire resistance rating as shown in Table 3.5.3.1. of Part 3.
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| 2012 |
12-0117 |
Fire Blocking at Bulkhead to Ceiling Space |
15/05/2018 |
File No: 12-0117 INTERPRETATION Page 1 of 3
Interpretation Date: May 15, 2018
Building Code Edition: BC Building Code 2012
Subject: Fire Blocking at Bulkhead to Ceiling Space
Keywords: Fire blocking, horizontal concealed spaces
Building Code Reference(s): 9.10.16.1.(2)(a)
Question:
Is a horizontal concealed space formed by a dropped bulkhead required to be fire blocked from a horizontal concealed space between floor joists, roof joists or roof trusses which are located directly above the bulkhead?
Interpretation:
No
Clause 9.10.16.1.(2)(a) requires that horizontal concealed spaces in attics, roof spaces, floors and crawl spaces be separated by fire blocks from one horizontal concealed space to another.
The dropped bulkhead is considered to be part of the same horizontal concealed space as the attic, roof spaces, floors and crawl spaces. So, fire blocking is not required to separate the dropped bulkhead from these concealed spaces.
It should be noted that it is not the intent that all horizontal concealed spaces be fire blocked from one another. Attached on Page 2 is an excerpt from NRC for the August 1993 Second Series of Proposed Changes to the 1990 National Building Code of Canada. The reason for this proposed change was to clarify that all vertical concealed spaces must be separated from all horizontal concealed spaces, but that only "certain" horizontal concealed spaces must be separated from other horizontal concealed spaces (e.g. the horizontal concealed space between floor joists must be separated from an adjacent attic space over lower storeys).
Attached on Page 3 is an excerpt from the 2014 User's Guide for Part 9 which indicates a furred down drywall ceiling with a gap between the underside of the floor joists and the top surface of the drywall ceiling. This gap interconnects the adjacent joist spaces, similar to a dropped bulkhead
Excerpt from NRC for the August 1993 Second Series of Proposed Changes to the 1990 National Building Code of Canada Fire ProtecUon 9.10.
Furring or strapping can also create splices that allow fire spread. These should al$o be blocked off
at each floor level and at the ceiling level if the reiling
membrane provides part of the required fire resistanoo (Figure 9.10.-38). Sincefurring can be instaUed either horizontally or vertically, both the horizontal and vertical spacing of fire bloclcs is limited (20 and 3 m (65 ft. 7 in. and 10 ft., respectively)).
9.10.16.3. Fire Block Materials
This Article sets the requirements for the conshuction of fire blocks, including acceptable materials capable of resisting the spread of fire within a concealed space for sufficient time to permit the safe evacuation of the
occupants, and to allow firefighting to commence before significant damage has c,ccurred.
Materials for fire blocking include 0.38 mm (28 gauge) sheet steel, 12.7 mm(½ in.) gypsum wallboard, 12.5 mm ('h in.) plywood, oriented strandboard or waferboard, two layers of 19 mm (o/1 in.) lumber with 5taggered joints, or 38 mm (1½ in. nominal) lurhber.
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| 2012 |
12-0118 |
Spacing Between Picket in Guards |
15/05/2018 |
File No: 12-0118 INTERPRETATION Page 1 of 1
Interpretation Date: May 15, 2018
Building Code Edition: BC Building Code 2012
Subject: Spacing Between Picket in Guards
Keywords: Guards, spacing, pickets
Building Code Reference(s): 3.3.1.18.(2)., 4.1.5.14.(2)
Question:
If the vertical pickets in a guard are spaced with a clear opening between pickets of 100 mm, and the pickets have been designed to meet the structural loads per Sentence 4.1.5.14.(2), does this guard meet the intent of Sentence 3.3.1.18.(2), even if a sphere that is more than 100 mm in diameter can be forcibly pushed through the 100 mm gap between pickets?
Interpretation:
Yes (based on the 2012 BCBC)
A guard with pickets that have a clear opening width of 100 mm as required by Sentence 3.3.1.18.(2) and meet the structural requirements of Sentence 4.1.5.14.(2), is considered to meet the intent of Sentence 3.3.1.18.(2).
It should be noted that the 2015 National Building Code of Canada has added a new Sentence 4.1.5.14.(4) that would alter this interpretation:
"4) The size of the opening between any two adjacent vertical elements within a guard shall not exceed the limits required by Part 3 when each of these elements is subjected to a specified live load of 0.1kN applied in opposite directions in the in-plane direction of the guard so as to produce the most critical effect"
If this provision is adopted in the 2018 BC Building Code, designers would have to reduce the 100 mm clear width between pickets to accommodate the structural deflection of 2 adjacent pickets when subjected to a load of 0.1 kN applied in opposite directions to each picket.
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| 2012 |
12-0120 |
Crossover Floors in a Basement |
18/09/2018 |
File No: 12-0120 INTERPRETATION Page 1 of 1
Interpretation Date: September 18, 2018
Building Code Edition: BC Building Code 2012
Subject: Crossover Floors in a Basement
Keywords: Emergency Access, Crossover Floors, Basement
Building Code Reference(s): 3.4.6.18.(1) and (2)
Question:
Where a building is required to have emergency access to floor areas, generally known as crossover floors, is this emergency access also required for below-grade floors?
Interpretation:
Yes.
In a building of more than 6 storeys in building height, Sentences 3.4.6.18.(1) and (2) require that access be provided from exit stairs into floor areas at intervals so that the travel distance up or down to an unlocked door from an exit into a floor area is not more than 2 storeys. On those storeys, typically referred to as crossover floors, a person must be able to travel through the floor area to at least one other exit. Any doors in the path of travel must be unlocked.
Sentences 3.4.6.18.(1) and (2) do not exempt basements, and therefore the requirements are also applicable to basements in buildings of more than 6 storeys.
It should also be noted that Article 3.4.6.18 has been revised in the BC Building Code 2018. The 6 storey criterion has been deleted. Crossover floors will be required so that the travel distance up or down to a crossover is no more than 2 storeys, regardless of the building height. Because the requirement for crossover floors will no longer depend on the number of storeys in the building, the requirement will more clearly apply to below-grade floor areas.
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| 2012 |
12-0121 |
Exterior Exit Passageway, Minimum Distance between Exit Stairs |
16/10/2018 |
Interpretation Date: October 16, 2018
Building Code Edition: BC Building Code 2012
Subject: Exterior Exit Passageway, Minimum Distance between Exit Stairs
Keywords: Exterior exit passageway, minimum distance between exit stairs
Building Code Reference(s): 3.4.2.3.(1)(b) & (3), 3.4.4.3.(1)(b)
Question:
A C-shape building layout with an exterior exit passageway along the inside perimeter has its 2 exit stairs located at each end of the exterior exit passageway such that the exits are spaced only 1.2m apart. Is this permitted? See reference floor plan diagram next page.
Interpretation:
No.
The building as described does meet the requirement of Clause 3.4.4.3.(1)(b) in concept, as exit stairs are provided at each end of the perimeter passageway. However Clause 3.4.2.3.(1)(b) requires that the 2 exits be spaced apart at least one half the maximum diagonal dimension of the floor area but not less than 9m, for a floor area without a protected public corridor. Based on Sentence 3.4.2.3.(3) this separation distance would be measured along the shortest distance that smoke travels between the 2 exits.
Sentence 3.4.4.3.(1) titled "Exterior Passageway Exceptions" references some exemptions, but does not indicate exemption from Article 3.4.2.3 for remoteness of exits requirements.
It is also notable that the National Building Code of Canada 2015 has an additional Sentence 3.4.2.3.(4) which provides that the distance between 2 exterior discharges of exit stairs serving the same floor area shall be minimum 9m apart, or 6m if the building is sprinklered and the 2 exterior discharges are within 15m of a street. This remoteness of exit discharge requirement is expected to be included in the next edition of the BC Building Code.
Providing a minimum 9m separation of the exit stairs for an exterior exit passageway is also consistent with the intent of Clause 3.4.4.3.(1)(b) to locate the exit stairs spaced remotely at each end of the passageway. However since the exterior exit passageway is already considered protected as an exit facility, it is not deemed necessary to exceed 9m. This would be similar to and consistent with the protected public corridor concept in Clause 3.4.2.3.(1)(a).
Refer also to past interpretation 12-0009. |
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| 2012 |
12-0122 |
Bracing to Resist Lateral Loads due to Wind & Earthquake |
15/10/2019 |
Interpretation Date: October 15, 2019
Building Code Edition: BC Building Code 2012
Subject: Bracing to Resist Lateral Loads due to Wind & Earthquake
Keywords: braced wall panels, braced wall bands
Building Code Reference(s): 9.23.13.5.(1) & (3)
Question:
Refer to the drawing on Page 2.
1. Are braced wall panels required at the outside corner column of Open Area A?
2. Does the 3.5m roof projection mentioned in 9.23.13.5.(3)(a)(i) include the roof overhang?
3. Does the "perpendicular plan dimension" mentioned in 9.23.13.5.(3)(a)(ii) include the roof overhang?
Interpretation:
1. No
Since Open Area A will have braced wall panels in Wall 1 and in Wall 2 which can resist the lateral loads due to wind and earthquake, it is not necessary to add braced wall panels at the outside corner column.
2. Yes
The roof projection mentioned in 9.23.13.5.(3)(a)(i) must include the roof overhang because lateral loads due to wind are created by the entire roof area, and lateral loads due to earthquake are created by the dead load of the entire roof projection.
3. No
The "perpendicular plan dimension" mentioned in 9.23.13.5.(3)(a)(ii) does not include the roof overhang. Refer to the Figure A - Table 9.23.13.5.-B-A in Division B-Appendix A for an illustration of the perpendicular plan dimension. See page 3 for this Figure.
Figure A Table 9.23.13.5. B A
Identification and spacing of adjacent non-parallel braced wall bands
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| 2012 |
12-0124 |
Occupant Load for Dining, Beverage and Cafeteria Space |
20/11/2018 |
Interpretation Date: November 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Occupant Load for Dining, Beverage and Cafeteria Space
Keywords: Occupant load; dining, beverage and cafeteria space; outdoor seating; means of egress; washrooms
Building Code Reference(s): 3.1.17.1, 3.7.2.2
Question:
A dining establishment has an indoor dining area of 200m2 and an adjoining outdoor dining area of 50m2•
1. How is the occupant load calculated?
2. How is means of egress considered?
3. How are washroom provisions considered?
Interpretation:
1. In this example the appropriate occupant load factor for both indoor and outdoor dining areas is 1.2m2/person. This results in potential respective occupant loads of 167 persons for the indoor dining area, and 42 persons for the outdoor dining area. The combined total of both indoor and outdoor dining would be 167+42=209 persons.
Sentence 3.1.17.1.(3) requires balconies to be regarded as part of the floor area, therefore similar adjoining contained exterior spaces are considered an extension of the interior floor area, for the purposes of occupant load calculations.
Such exterior areas are quite often covered or enclosed by awnings, canopies, or tent-like enclosures to facilitate extended use.
If it can be demonstrated that fewer persons will actually occupy both interior and exterior spaces simultaneously, then this would be consistent with Clause 3.1.17.1.(1)(c).
Exterior space seating is typically seasonal and the occupants are often either seated indoors or outdoors depending on the weather; discussion and agreement with the Authority having Jurisdiction may be warranted.
2. Depending on the arrangement of the dining premises, the means of egress must consider the combined total occupant load of both indoor and outdoor (209 persons) if the outdoor area has its means of egress via the indoor dining area, and vice versa.However, if each area is independently served by its own means of egress, then the respective occupant load of each area could be considered separately for the purposes of means of egress.
3. If the washroom facilities are only provided via the indoor dining area and if it is expected that both indoor and outdoor areas are fully occupied simultaneously, the combined total occupant load of both indoor and outdoor areas should be used for calculating washroom counts. Otherwise the anticipated occupant load should be used if the outdoor seating areas are only seasonally occupied.
Refer to the discussion in item 1. on the occupant load calculations.
See also past Building Code Interpretation 12-0045.
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| 2012 |
12-0125 |
Tactile Warning Strips |
19/06/2018 |
File No: 12-0125 INTERPRETATION Page 1 of 1
Interpretation Date: June 19, 2018
Building Code Edition: BC Building Code 2012
Subject: Tactile Warning Strips
Keywords: tactile warning strips, exit stairs, access for persons with disabilities
Building Code Reference(s): 3.4.6.8.(11)(b), 3.8.3.11
Question:
For a multi-storey building served by 2 enclosed exit stairs and having an elevator at the entrance lobby, are tactile warning strips required at the exit stairs?
Yes, with exceptions.
Sentence 3.4.6.8.(11) requires that stairs be provided with tactile warning strips conforming to Article 3.8.3.11, unless the stairs are exit stairs not normally used for access purposes.
This is further explained in the Building Access Handbook 2014, p47, indicating that "tactile warning strips are required for stairs that provide access", and that "stairs intended primarily for emergency egress do not require tactile warning systems. Situations other than those described here will inevitably occur and the question to be asked is whether or not these stairs are in such a location as to necessitate a tactile warning to persons with visual impairment."
Exit stairs are typically used only under emergency conditions, however they are often used by occupants for access even when there are elevators available, and some occupants make this choice. The stairs are also the only option when elevators are not functioning or are being serviced
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| 2012 |
12-0126 |
National Farm Building Code |
15/05/2018 |
File No: 12-0126 INTERPRETATION Page 1 of 1
Interpretation Date: May 15, 2018
Building Code Edition: BC Building Code 2012
Subject: National Farm Building Code
Keywords: National Farm Building Code, National Building Code
Building Code Reference(s): 1.1.1.1.(4)
Question:
Are farm buildings required to conform to the BC Building Code or the National Building Code?
Interpretation:
National Building Code 1995
According to Division A, Part 1, Sentence 1.1.1.1.(4) of the 2012 BC Building Code, farm buildings shall conform to the requirements in the National Farm Building Code of Canada 1995.
Part 1, Sentence 1.1.1.3.(1) of the National Farm Building Code of Canada 1995 states that "farm buildings shall conform to the appropriate requirements in the National Building Code of Canada 1995 except as specifically amended or exempted by the provisions of this Code".
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| 2012 |
12-0127 |
Guard Height and Curb: Addressed by previous interpretation 06-0107 |
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Interpretation Date: February 21, 2012
Building Code Edition: BC Building Code 2006
Subject: Guard climbability
Keywords: Guards, climbability, fall hazard, walking surface
Building Code Reference(s): 9.8.8.6.
The Building Code Subsection 9.8.8. generally requires a guard 1070mm high where there is a risk of falling at changes in elevation over 600mm. Article 9.8.8.6. requires that except where the location and size of openings do not present a hazard, the design must not have any member, attachment or opening in the range of 140 to 900mm above the floor or walking surface protected by the guard, that will facilitate climbing. Sentence 9.8.8.6.(2) sets out the acceptable design criteria to discourage climbability of required guards.
A concrete curb less than 140mm high above is provided at the bottom of the guard, and the guard is mounted on the outside face of this curb (away from the walking surface).
1. Can this 140mm high curb be considered part of the guard and therefore permitted?
2. Under what circumstance would this curb be considered a walking surface such that the guard needs to be raised by an additional 140mm over the minimum 1070mm?
1. Yes.
A typical curb used to mount a guard is usually sufficiently narrow in thickness that it cannot readily be used as a walking surface. Therefore provided the curb is less than 140mm high, it can constitute the bottom member of the guard that is exempt from the climbability provisions of Article 9.8.8.6.
2. A suitable criterion would be to consider whether the curb width exceeds that for a minimum step dimension (210mm). A curb thickness more than 210mm would then be considered a walking surface, and the guard would have to be raised an additional 140mm.
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| 2012 |
12-0128 |
Limiting Distance for Sprinklered House with Attached Unsprinklered Garage |
20/11/2018 |
File No: 12-0128 INTERPRETATION Page 1 of 1
Interpretation Date: November 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Limiting Distance for Sprinklered House with Attached Unsprinklered Garage
Keywords: Limiting distance, spatial separation and exposure protection, unsprinklered attached garage, sprinkler exemptions
Building Code Reference(s): 9.10.15.3.(1)(b), 9.10.15.4.(1), 9.10.1.3.(8), 3.2.5.12.(3),
NFPA 13D 2010 edition 8.6.4.
Question:
If a house is fully sprinklered to NFPA 13D, but the attached garage remains unsprinklered as permitted by NFPA 13D exception, must the limiting distance for purposes of spatial separation and exposure protection be halved in accordance with Clause 9.10.15.3.(1)(b)?
Interpretation:
No.
A house with an automatic sprinkler system is protected to NFPA 13D by application of Sentences 9.10.1.3.(8) and 3.2.5.12.(3). NFPA 13D, 8.6.2, requires sprinklers to be installed in all areas except where omissions are permitted by 8.6.2 through 8.6.7. Reference 8.6.4 permits omission of sprinklers in garages. Notwithstanding this and other permitted omissions, the house is still considered fully sprinklered.
Therefore Clause 9.10.15.3.(1)(b) would not be applicable to such a protected house and the limiting distance would not be required by this clause to be halved for the purposes of spatial separation and exposure protection:
Note that the NFPA 13D commentary A.8.6.4 does explain that: "Although NFPA 13D does not require garages to be sprinklered, some authorities having jurisdiction take it upon themselves to add this requirement locally. In such circumstances, residential or quick-response sprinklers with a two sprinkler design in the garage with the same piping used in the rest of the dwelling can be used. It is recognized that residential sprinklers have not been tested specifically for fires in garages, but field experience has shown that the sprinklers help to alert occupants to the fact that there is a fire, to reduce the possibility of flashover, and to improve the chances for occupants to escape."
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| 2012 |
12-0129 |
Combustible Acoustical Insulation in a Noncombustible Building |
18/10/2018 |
File No: 12-0129 INTERPRETATION Page 1 of 1
Interpretation Date: October 16, 2018
Building Code Edition: BC Building Code 2012
Subject: Combustible Acoustical Insulation in a Noncombustible Building
Keywords: Insulation, combustible, wall finish
Building Code Reference(s): 3.1.5.10.(2), 3.1.5.12.(1), 3.1.13.1.(2)
Question:
Combustible acoustical insulation is applied to the interior surface of the walls of a sound studio in a building that is required to be non-combustible construction. This combustible acoustical insulation is not foamed plastic insulation, has a flame spread rating of not more than 25, and is exposed to the interior of the room.
Is the insulation considered to be an interior finish which is regulated by 3.1.5.10.(2), or is it considered to be insulation which is regulated by 3.1.5.12.(1)?
Interpretation:
Sentence 3.1.13.1.(2) states that interior finish material shall include any material that forms part of the interior surface of a floor, wall, partition or ceiling.
Since the combustible acoustical insulation is applied to the interior surface of the wall, and is exposed to the interior of the room, it is considered to be an interior finish and must comply with Sentence 3.1.5.10.(2).
Sentence 3.1.5.10.(2) permits the use of combustible interior wall finishes provided that the thickness of the wall finish does not exceed 25mm, and the flame spread rating of the wall finish does not exceed 150.
Sentence 3.1.5.12.( 1) permits the use of combustible insulation, other than foamed plastic insulation, in a building that is required to be non-combustible construction, when the flame spread rating of the insulation is not more than 25 on both the surface and on any exposed surface when in any direction. This sentence does not have any limitations on the thickness of the combustible insulation.
Article 3.1.5.12. does not stipulate where the combustible insulation can be in the building, but if it is installed as an interior wall finish, they 25 mm maximum thickness per 3.1.5.10.(2) would apply.
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| 2012 |
12-0130 |
Elevator Pit Drainage |
16/09/2018 |
File No: 12-0130 INTERPRETATION Page 1 of 1
Interpretation Date: September 16, 2018
Building Code Edition: BC Building Code 2012 (Book II: Plumbing Systems)
Subject: Elevator Pit Drainage
Keywords: Elevator Pit, Drainage, Oil Interceptor
Building Code Reference(s): Book II - 2.4.3.6.(1), 2.4.4.3.(2), 2.5.5.2.
Question:
1. When is a drain required for an elevator pit?
2. When a drain is required, is the discharge required to be piped through an oil interceptor?
Interpretation:
1. The Building Code Interpretation Committee is not the appropriate body to answer this question. Technical Safety BC is the authority which oversees the installation of elevating devices in the Province and would therefore be the appropriate agency to answer this question. The Committee has attached a news item from Technical Safety BC (dated December 16, 2014) which may provide some guidance.
2. No, unless the elevator is hydraulically operated.
Sentence 2.4.3.6.(1) of the British Columbia Building Code (Book II: Plumbing Systems) requires that where a drain is provided in an elevator pit it must be connected directly to a sump located outside the elevator pit and that the drain pipe that connects the sump to the drainage system is provided with a backwater valve.
Sentence 2.4.4.3.(2) of Book II states "Where the discharge from a fixture may contain oil or gasoline, an oil interceptor shall be installed. (See Article 2.5.5.2. for venting requirements for oil
interceptors.r
It would be reasonable to conclude that since Sentence 2.4.3.6.(1) is included in the prescriptive requirements of Division B, Part 2 of Book 11, there are circumstances where an oil interceptor is not required. If the elevating machinery is hydraulically operated an oil interceptor that drains to sanitary would be required.
This Interpretation is consistent with BC Building Code Interpretation #06-0098.
Elevator Pit Drains
16 December 2014
The CSA B44-07 Code requires that every pit for an elevator provided with firefighters' service be provided with a sump pump or a drain.
"2.2.2.4: Drains and sump pumps, where provided, shall comply with the applicable plumbing code, and they shall be provided with a positive means to prevent water, gases, and odors from entering the hoistway.
2.2.2.5: In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. The sump pump/drain shall have the capacity to remqve a minimum of 11.4 m3/h (3,000 gallh) per elevator.
2.2.2.7: In jurisdictions enforcing the NBCC, sump pumps and their control equipment shall not be installed in any elevator pit."
All new elevators installed under the CSA B44-07 code are provided with firefighter service. hence all pits require a sump pump or a drain.
Water from building sprinkler systems or other sources, such as fire suppression, should not be allowed to accumulate in a pit. If a sump pump is utilized, it must be permanently installed. This provision is intended to assist in maintaining elevator service during a fire emergency. The minimum capacity of a sump pump/drain must be equal to the output from a typical sprinkler head. This may not guarantee a pit free from water but will give firefighters additional time to use the elevator before water in the pit may interfere with the elevator operation.
The possibility of sewer gases entering the hoistway is also to be eliminated, as the sump pump or drain typically discharges into the open air outside the pit and hoistway. In Canada, a sump pump is not permitted to be installed in pits, in order to avoid non-elevator personnel from having to enter the pit to service the pump.
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| 2012 |
12-0131 |
Insulating Glass Units |
20/11/2018 |
Interpretation Date: November 20, 2018
Building Code Edition: BC Building Code 2012
Subject: Insulating Glass Units
Keywords: Insulating Glass Units, reference standards Building Code Reference(s): 5.10.1.1.(1), Table 5.10.1.1., 9.6.1.2.
Question:
Table 5.10.1.1. includes 2 different reference standards for Insulating Glass Units.
• ASTM - E 2190-10 - Insulating Glass Unit Performance and Evaluation, and
• CAN/CGSB-12.8-97 - Insulating Glass Units.
For Part 3 buildings, is it required that Insulating Glass Units comply with both reference standards?
Interpretation:
No
Sentence 5.10.1.1. requires that "materials and components, and their installation, shall conform to the requirements of the applicable standards in Table 5.10.1.1."
The 2 referenced standards in Table 5.10.1.1. are very similar in their performance requirements for insulating glass units, so compliance to either ASTM - E2190 or CAN/CGSB-
12.8 is acceptable.
This is consistent with the requirements for Part 9 buildings in Article 9.6.1.2. where the list of Material Standards for Glass clearly states that either ASTM - E2190 or CAN/CGSB-12.8 is acceptable.
This is also consistent with NAFS 2011 - Subsection 10.2.1. which indicates that either ASTM - E2190 or CAN/CGSB-12.8 is acceptable.
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| 2012 |
12-0132 |
Live/Work Units |
09/12/2018 |
File No: 12 0132 INTERPRETATION Page 1 of 2
Interpretation Date: December 9, 2018
Building Code Edition: BC Building Code 2012
Subject: Live/Work Units
Keywords: Live/work
Building Code Reference(s): 3.1.3.1., 3.1.3.2., 3.2.3., 3.3., 3.4., 3.7., 3.8., 6.
Question:
Live/work units are typically residential units having additional space designed for non-residential uses which are an integral extension of the occupants' unit to allow for work activities. Such areas may sometimes allow for visitors, customers or additional work staff. How are such live/work units addressed in the Building Code?
Interpretation:
Live/work units are not addressed in the Building Code. There are however some other jurisdictions that have addressed live/work units to some extent in their Zoning and Development Bylaws and local Building Bylaws/Codes, examples being City of Vancouver (for artists live/work units) and Ontario. It is suggested a Building Code analysis and assessment of the specific live/work design be undertaken, which would address the following specific Building Code issues:
1. Occupancy classification. For the non-residential uses the range of occupancy type can range from something relatively benign such as small scale cooking demonstration space to more hazardous activities such as welding shop. The range of possible uses may be narrowed down by reference to local Zoning and Development restrictions or the project Development Permit regulating the allowable uses of the live/work units. In some cases the non-residential activity can be considered integral or subsidiary to the residential use, and in other cases may need to be considered a separate major occupancy entirely.
2. Size. Criteria such as size of the various uses, or the percentage of non-residential versus the residential should be evaluated.
3. Occupancy separations. The necessity for occupancy separations will depend on the occupancy classifications and nature of risk posed to the residential use, or vice versa.
4. Spatial separation and exposure protection. For work spaces involving retail or industrial uses there may be additional exposure impacts requiring further analysis.
5. Means of egress. Evacuation risks and how egress from the residential or non-residential spaces performs, must be evaluated.
6. Special hazards. Non-residential uses must be evaluated for special hazards regulated by the BC Fire Code, NFPA standards, etc. Note that there may also be other regulatory agencies with other regulations involved such as health and environmental control authorities, WorkSafe BC, Technical Safety BC, etc.
7. Ventilation. Ventilation design must also consider the non-residential use, and the interface between residential and non-residential may need to be considered.
8. Accessibility provisions. The non-residential portion of the live/work unit is not typically exempt from accessibility provisions, and must be designed accordingly.
9. Washroom provisions. The non-residential portion of the live/work unit will require washrooms if intended for visitors, customers or additional work staff, and must also be designed for accessibility.
10. Other design disciplines. Coordination with other design disciplines such as building envelope, structural, mechanical/plumbing, fire suppression, electrical, etc, will be necessary
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| 2012 |
12-0134 |
Paint Spray Booths |
09/12/2018 |
Interpretation Date: December 9, 2018
Building Code Edition: BC Building Code 2012
Subject: Paint Spray Booths
Keywords: Paint Spray Booth, Major Occupancy
Building Code Reference(s): Division A 1.4.1.2, Division C 3.2.2.8.(1), 3.3.1.2.(1), A-3.1.2.1.(1), BC Fire Code
Question:
Is a suite or portion of a building containing a paint spray booth required to be classified as a Group F, Division 1 (high hazard industrial) major occupancy?
Interpretation:
No.
Paint spray booths may be installed in various types of facilities such as metal fabrication shops, vehicle repair shops, or manufacturing facilities. For the purposes of this interpretation, it is assumed that paint spraying is not the main activity in the suite where the spray booth is located.
Paint spraying may be done with flammable or combustible liquids, which may create a high fire hazard. Sentence 3.2.2.8.(1) states that a major occupancy whose aggregate area is not more than 10% of the floor area in which it is located need not be considered as a major occupancy for the purposes of Subsection 3.2.2, provided it is not classified as a Group F, Division 1 or 2 occupancy.
Appendix reference A-3.1.2.1.(1) gives "Spray painting operations" as one of the examples of a Group F, Division 1 major occupancy classification. Division A, Article 1.4.1.2 includes the following definition: "Major occupancy means the principal occupancy for which a building or part thereof is used or intended to be used, and shall be deemed to include the subsidiary occupancies that are an integral part of the principal occupancy."
In a typical facility such as a metal fabrication shop or a vehicle repair shop, the paint spray booth is not the "principal occupancy" of the facility. Therefore, the paint spray booth is not the major occupancy.
Sentence 3.3.1.2.(1) refers to Subsections 3.3.5 and 3.3.6, provincial regulations or municipal bylaws, and the BC Fire Code, with respect to the storage, handling and use of hazardous substances.
Subsections 3.3.5 and 3.3.6 do not directly address paint spray booths. Subsection 5.4.6 of the BC Fire Code addresses spray coating processes involving combustible dry powders, flammable liquids or combustible liquids. BCFC 5.4.6.2.(1) requires that the design, operation and maintenance requirements for spray coating processes shall conform to NFPA 33 "Spray Application Using Flammable or Combustible Materials".
It is interpreted that a paint spray booth in a facility where paint spraying is not the main use of the facility is a specific hazard required to be protected in accordance with NFPA 33, and the paint spray booth is not a major occupancy. Note that if paint spraying is the main activity of the suite or facility, a Group F, Division 1 occupancy classification would be appropriate.
This interpretation request was submitted under the BC Building Code 2012. The BC Building Code 2018 has now been issued. The applicable requirements in the Building Code and Fire Code have not meaningfully changed between the 2012 and 2018 editions and therefore this interpretation is also valid for the BC Building Code 2018.
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| 2012 |
12-0135 |
Construction of Exposing Building Face of Houses |
08/12/2018 |
Interpretation Date: December 9, 2018 (Revised Oct 15, 2019}
Building Code Edition: BC Building Code 2012
Subject: Construction of Exposing Building Face of Houses
Keywords: Construction, exposing building face, cladding Building Code Reference(s): 9.10.15.5.(3)
Question:
Wl'len tnelimiting cfistance for an exposing 6uilaing face ofahouse isbetween 0.6m and 1.2m, is the exterior cladding always required to have gypsum board sheathing beneath it?
Interpretation:
No (only some types of cladding require gypsum sheathing)
Sentence 9.10.15.5.(3) requires that the exposing building face and any exterior wall above the exposing building face (e.g. attic exterior wall) be constructed with a 45 minute fire resistance rating within any one of the cladding systems described in Clauses (a) to (d).
Clause (a) permits metal or noncombustible cladding with no gypsum sheathing
Clause (b) permits wood cladding provided it is installed on a minimum 12.7 mm thick gypsum sheathing or on masonry, or on furring channels with a maximum thickness of 25mm that are that are mounted on a minimum 12.7 mm thick gypsum sheathing or on masonry. The wood siding must also have a maximum 25 FSR after conditioning for Accelerated Weathering per ASTM D 2898.
Clause (c) permits vinyl cladding with no gypsum sheathing when mounted over masonry
Clause (d) permits cladding systems that have been tested to CAN/ULC-S134 which may or may not include gypsum sheathing.
Note the change to Article 9.10.15.5. in Revision 6 of the 2012 BCBC as noted below:
26 S11bcl,111.'fe 9.I0.15.5.(2)(b)(i) is fllllemle,I hy strikiug 0111 "Subseclion 9.27.11.," mul
.rnb.-.1itt11h1g "Subsection 9.27.12.,".
The wording of Sentence 9.10.15.5.(3) in the 2018 BCBC has not changed, so this interpretation would also apply to the 2018 BCBC
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| 2012 |
12-0137 |
Wired Glass and Glass Block in Exposing Building Face of Houses |
09/12/2018 |
Interpretation Date: December 9, 2018
Building Code Edition: BC Building Code 2012
Wired Glass and Glass Block in Exposing Building Face of
Subject: Houses
Keywords: Wired glass, glass block, closure, exposing building face
Building Code Reference(s): 9.10.13.5., 9.10.13.7., 9.10.14.4.(2), 9.10.15.
Question:
In buildings that only contain dwelling units and have no dwelling unit above another dwelling unit, can wired glass assemblies per Article 9.10.13.5. and glass block per Article 9.10.13.7. be considered as "closures" in an exposing building face when the limiting distance is less than 1.2 m?
Interpretation:
Yes
Spatial separation requirements for Part 9 buildings, other than houses, is described in Subsection 9.10.14.
Article 9.10.14.4.(2) clearly states that wired glass and glass block cannot be considered as closures in an exposing building face when the limiting distance is less than 1.2 m.
Spatial separation requirements for houses (i.e. non-stacked dwelling units) is described in Subsection 9.10.15.
Subsection 9.10.15. does not have any restrictions on the use of wired glass or glass block in an exposing building face of a house when the limiting distance is less than 1.2m.
Note that the wording of 2018 BCBC Subsection 9.10.15. has not changed with respect to the use of wired glass or glass block, so this interpretation would also apply to the 2018 BCBC.
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| 2012 |
12-0138 |
Sound Separation Requirements between Dwelling Units and Exterior Exit Passageways |
09/12/2018 |
Interpretation Date: December 9, 2018
Building Code Edition: BC Building Code 2012
Subject: Sound Separation Requirements between Dwelling Units and Exterior Exit Passageways
Keywords: Dwelling units, sound separation, exterior exit passageways
Building Code Reference(s): 3.3.4.6.(1); 5.9.1.
Question:
Sentence 3.3.4.6.(1) requires that" Sound transmission class ratings of building assemblies shall conform to Section 5.9." Sentence 5.9.1.2.(1) requires that "... a dwelling unit shall be separated from every other space in a building in which noise may be generated by...." sound separation assemblies having performance requirements to mitigate noise transmission through such assemblies.
Does this sound separation requirement also apply at the doors and windows between dwelling units and exterior exit passageways?
Interpretation:
No.
The requirements of Subsection 5.9 are intended to apply between dwelling units and other spaces in the building, but not between the dwelling units and the exterior exit passageway. Division A, Article 1.4.1.2., indicates: "Building means any structure used or intended for supporting or sheltering any use or occupancy." Exterior exit passageways are considered as exterior circulation space used only for access and means of egress, as distinct from supporting or sheltering any use or occupancy.
The Appendix A note A-5.9 also clarifies that "Sentence 5.9.1.2.(1) applies to the separation of dwelling units from other dwelling units with regard to sound transmission irrespective of Clause 5.1.2.1(1)(b), which deals with the separation of dissimilar environments. It is understood that, at any time, there is the potential for sound levels to be quite different in adjoining dwelling units." The referenced Clause 5.1.2.1.(1)(b) confirms that Part 5 applies to: "bullding materials, components and assemblies separat[ng environmentally dissimilar interior spaces... "
Therefore, it is interpreted that the requirements of Subsection 5.9 apply between dwellings, or between dwelling units and other building components such as public corridors, elevators, or refuse chutes; but not between the dwelling units and an exterior exit passageway.
It should be noted that there are new requirements for sound separation barriers in the BC Building Code 2018. For example Sentence 5.8.1.1.(1) now includes additional requirements for addressing flanking sound transmission mitigation, such as "apparent sound transmission class" (ASTC) rating requirements. |
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| 2012 |
12-0139 |
Craft Brewery with Restaurant |
18/03/2019 |
Interpretation Date: March 18, 2019
Building Code Edition: BC Building Code 2012
Subject: Craft Brewery with estaurant
Page 1 of 1
1
Keywords:
Building Code Reference(s):
Question:
Craft brewery, restaurant, brew pub, major occupancies, subsidiary occupancies
Div A-1.4.1.2. (defn major occupancy), Div B-3.1.3.1.(1)
This project is a 2 storey building that contains both a Craft Brewery (about 40% of the total floor area) and a restaurant (about 60% of the total floor area including a commercial kitchen), commonly referred to as a "Brew Pub".
Is a fire separation required between the Craft Brewery and the restaurant components?
Interpretation:
No
The definition of "major occupancy" means the principal occupancy for which a building or part thereof is used or intended to be used and shall be deemed to include the subsidiary occupancies that are integral part of the principal occupancy.
The Craft Brewery is considered to be a subsidiary use to the restaurant, similar to a commercial kitchen.
A commercial kitchen prepares food which is served in the restaurant. The Craft Brewery prepares beer which is also served in the restaurant.
The manufacturing of beer is not considered to be a hazardous operation and should not create any tife safety concerns in being open to the restaurant.
The major occupancy for this building would be Group A Division 2.
Also refer to BC Building Code Appeal Board Decision #1793.
Note that the wording of 2018 BCBC has not changed with respect to subsidiary occupancies, so this interpretation would also apply to the 2018 BCBC.
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