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(1) The flame-spread rating of combustible light diffusers and lenses in all occupancies other than Group A, Division 1 is permitted to be more than the flame-spread rating limits required elsewhere in this Subsection, provided the light diffusers and lenses,
(a) have a flame-spread rating not more than 250 and a smoke developed classification not more than 600 when tested in conformance with CAN/ULC-S102.2, “Test for Surface Burning Characteristics of Flooring, Floor Coverings, and Miscellaneous Materials and Assemblies”,
(b) fall to the bottom of the test apparatus before igniting when tested in conformance with ULC-S102.3, “Fire Test of Light Diffusers and Lenses”,
(c) are not prevented from falling from the ceiling by construction located beneath the elements, and
(d) are not used in a corridor that is required to be separated from the remainder of the building by a fire separation or in an exit shaft unless individual diffusers or lenses are not more than 1 m2 in area and are not less than 1.2 m apart.
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(1) Except as provided in Sentences (2) and (3), combustible interior wall and ceiling finishes described in Clause 3.1.13.1. (1)(b) that are not more than 1 mm thick are permitted in a building required to be of noncombustible construction. (2) Combustible interior wall finishes, other than foamed plastics, that are not more than 25 mm thick are permitted in a building required to be of noncombustible construction, provided they have a flame-spread rating not more than 150 on any exposed surface or any surface that would be exposed by cutting through the material in any direction. (3) Except as provided in Sentence (4), combustible interior ceiling finishes, other than foamed plastics, that are not more than 25 mm thick are permitted in a building required to be of noncombustible construction, provided that,
(a) they have a flame-spread rating not more than 25 on any exposed surface or on any surface that would be exposed by cutting through the material in any direction, and
(b) not more than 10% of the ceiling area within each fire compartment where such finishes are installed has a flame-spread rating not more than 150. (4) Combustible interior ceiling finishes made of fire-retardant treated wood are permitted in a building required to be of noncombustible construction, provided they are not more than 25 mm thick or are exposed fire-retardant treated wood battens.
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(1) Gypsum board with a tightly adhering paper covering not more than 1 mm thick is permitted in a building required to be of noncombustible construction provided the flame-spread rating of the surface is not more than 25.
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(1) Foamed plastic insulation shall conform to Article 3.1.5.12A. (2) Combustible insulation with a flame-spread rating not more than 25 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in a building required to be of noncombustible construction. (3) Combustible insulation is permitted to be installed above roof decks, outside of foundation walls below ground level and beneath concrete slabs-on-ground of buildings required to be of noncombustible construction. (4) Except as provided in Sentences (5) and (6), combustible insulation with a flame-spread rating more than 25 but not more than 500 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in a building required to be of noncombustible construction, provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier consisting of,
(a) not less than 12.7 mm thick gypsum board mechanically fastened to a supporting assembly independent of the insulation,
(b) lath and plaster, mechanically fastened to a supporting assembly independent of the insulation,
(c) masonry, or
(d) concrete. (5) Combustible insulation with a flame-spread rating more than 25 but not more than 500 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in the exterior walls of a building required to be of noncombustible construction, that is not sprinklered and is more than 18 m high, measured from grade to the underside of the roof, provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier that,
(a) consists of gypsum board not less than 12.7 mm thick, mechanically fastened to a supporting assembly independent of the insulation and with all joints either backed or taped and filled,
(b) consists of lath and plaster, mechanically fastened to a supporting assembly independent of the insulation,
(c) consists of masonry or concrete not less than 25 mm thick, or
(d) when tested in conformance with CAN/ULC-S101, “Fire Endurance Tests of Building Construction and Materials”, does not develop an average temperature rise more than 140°C or a maximum temperature rise more than 180°C at any point on its unexposed face within 10 min. (6) Combustible insulation with a flame-spread rating more than 25 but not more than 500 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in the interior walls, within ceilings and within roof assemblies of a building required to be of noncombustible construction, that is not sprinklered and is more than 18 m high, measured from grade to the underside of the roof, provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier that,
(a) consists of Type X gypsum board not less than 15.9 mm thick, mechanically fastened to a supporting assembly independent of the insulation and with all joints either backed or taped and filled, conforming to,
(i) ASTM C1177 / C1177M, “Glass Mat Gypsum Substrate for Use as Sheathing”,
(ii) ASTM C1178 / C1178M, “Coated Glass Mat Water-Resistant Gypsum Backing Panel”,
(iii) ASTM C1396 / C1396M, “Gypsum Board”,
(iv) ASTM C1658 / C1658M, “Glass Mat Gypsum Panels”, or
(v) CAN/CSA-A82.27-M, “Gypsum Board”,
(b) consists of non-loadbearing masonry or concrete not less than 50 mm thick,
(c) consists of loadbearing masonry or concrete not less than 75 mm thick, or
(d) when tested in conformance with CAN/ULC-S101, “Fire Endurance Tests of Building Construction and Materials”,
(i) does not develop an average temperature rise more than 140°C or a maximum temperature rise more than 180°C at any point on its unexposed face within 20 min, and
(ii) remains in place for not less than 40 min.
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(1) Except as permitted by Sentence (2), solid lumber partitions not less than 38 mm thick and wood framing in partitions located in a fire compartment not more than 600 m2 in area are permitted to be used in a building required to be of noncombustible construction in a floor area that is not sprinklered provided the partitions,
(a) are not required fire separations, and
(b) are not located in a care, care and treatment or detention occupancy or in a retirement home. (2) Partitions installed in a building required to be of noncombustible construction are permitted to contain wood framing provided,
(a) the building is not more than 3 storeys in building height,
(b) the partitions are not located in a care, care and treatment or detention occupancy or in a retirement home, and
(c) the partitions are not installed as enclosures for exits or vertical service spaces. (3) Solid lumber partitions not less than 38 mm thick and partitions that contain wood framing are permitted to be used in a building required to be of noncombustible construction provided,
(a) the floor area containing the partitions is sprinklered, and
(b) the partitions are not,
(i) located in a care, care and treatment or detention occupancy or in a retirement home,
(ii) installed as enclosures for exits or vertical service spaces, or
(iii) used to satisfy the requirements of Clause 3.2.8.1. (1)(a).
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(1) Except in a retirement home, storage lockers in storage rooms are permitted to be constructed of wood in a building of residential occupancy required to be of noncombustible construction.
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(1) Except as required by Sentence 3.6.4.3. (1), combustible ducts, including plenums and duct connectors, are permitted to be used in a building required to be of noncombustible construction provided these ducts and duct connectors are used only in horizontal runs. (2) Combustible duct linings, duct coverings, duct insulation, vibration isolation connectors, duct tape, pipe insulation and pipe coverings are permitted to be used in a building required to be of noncombustible construction provided they conform to the appropriate requirements of Part 6. (3) In a building required to be of noncombustible construction, combustible ducts need not comply with the requirements of Part 6 provided the ducts are,
(a) part of a duct system conveying only ventilation air, and
(b) contained entirely within a dwelling unit.
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(1) Except as permitted by Sentences (2) and (3) and by Clause 3.1.5.2. (1)(d) and Article 3.1.5.22., combustible piping and tubing and associated adhesives are permitted to be used in a building required to be of noncombustible construction provided that, except when concealed in a wall or concrete floor slab, they,
(a) have a flame-spread rating not more than 25, and
(b) if used in a building described in Subsection 3.2.6., have a smoke developed classification not more than 50. (2) Combustible sprinkler piping is permitted to be used within a sprinklered floor area in a building required to be of noncombustible construction. (3) Polypropylene pipes and fittings are permitted to be used for drain, waste and vent piping for the conveyance of highly corrosive materials and for piping used to distribute distilled or dialyzed water in laboratory and hospital facilities in a building required to be of noncombustible construction, provided,
(a) the building is sprinklered,
(b) the piping is not located in a vertical shaft, and
(c) piping that penetrates a fire separation is sealed at the penetration by a fire stop that has an FT rating not less than the fire-resistance rating of the fire separation when subjected to the fire test method in CAN/ULC-S115, “Fire Tests of Firestop Systems”, with a pressure differential of 50 Pa between the exposed and unexposed sides, with the higher pressure on the exposed side.
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(1) Combustible plumbing fixtures are permitted in a building required to be of noncombustible construction if they are constructed of material having a flame-spread rating and smoke developed classification permitted in Subsection 3.1.13.
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(1) Except as permitted by Sentence (2) and Articles 3.1.5.19. and 3.1.5.21., optical fibre cables and electrical wires and cables with combustible insulation, jackets or sheathes are permitted in a building required to be of noncombustible construction, provided,
(a) the wires and cables exhibit a vertical char of not more than 1.5 m when tested in conformance with the Vertical Flame Test – Cables in Cabletrough in Clause 4.11.4. of CSA C22.2 No. 0.3, “Test Methods for Electrical Wires and Cables”, (FT4 Rating),
(b) the wires and cables are located in,
(i) totally enclosed noncombustible raceways,
(ii) concealed spaces in walls,
(iii) concrete slabs,
(iv) a service room separated from the remainder of the building by a fire separation having a fire-resistance rating not less than 1 h, or
(v) totally enclosed nonmetallic raceways conforming to Clause 3.1.5.20. (1)(b), or
(c) the wires and cables are communication cables used at the service entry to a building and are not more than 3 m long. (2) The requirement in Clause (1)(a) is considered to be met where the wires and cables exhibit a flame-spread of not more than 1.5 m, a smoke density of not more than 0.5 at peak optical density and a smoke density not more than 0.15 at average optical density when tested in conformance with the Flame and Smoke Test in the Appendix to CSA C22.2 No. 0.3, “Test Methods for Electrical Wires and Cables”, (FT6 Rating).
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(1) Combustible travelling cables are permitted on elevating devices in a building required to be of noncombustible construction.
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(1) The following minor combustible components are permitted in a building required to be of noncombustible construction:
(a) paint,
(b) self-adhesive tapes, mastics and caulking materials applied to provide flexible seals between the major components of exterior wall construction,
(c) fire stops conforming to Sentence 3.1.9.1. (1) and fire blocks conforming to Article 3.1.11.7.,
(d) tubing for pneumatic controls provided it has an outside diameter not more than 10 mm,
(e) adhesives, vapour barriers and sheathing papers,
(f) electrical outlet and junction boxes,
(g) wood blocking within wall assemblies intended for the attachment of handrails, fixtures, and similar items mounted on the surface of the wall, and
(h) similar minor components.
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(1) Except as provided by Subclause 3.6.4.3. (1)(a)(iv) and subject to limits on size for penetrations of fire separations as required by Sentence 3.1.9.3. (2), within a fire compartment of a building required to be of noncombustible construction, totally enclosed nonmetallic raceways not more than 175 mm in outside diameter, or an equivalent rectangular area, are permitted to be used to enclose optical fibre cables and electrical wires and cables, provided, where,
(a) the wires and cables in the raceways meet or exceed the requirements of Clause 3.1.5.18. (1)(a), the nonmetallic raceways meet the requirements for at least an FT4 rating in,
(i) CAN/CSA-C22.2 No. 262, “Optical Fiber Cable and Communication Cable Raceway Systems”, or
(ii) CAN/ULC-S143, “Fire Tests for Non-Metallic Electrical and Optical Fibre Cable Raceway Systems”, and
(b) the wires and cables in the raceways do not meet or exceed the requirements of Clause 3.1.5.18. (1)(a), the nonmetallic raceways exhibit a vertical char not more than 1.5 m when tested in conformance with the Vertical Flame Test (FT4) – Conduit or Tubing on Cable Tray in Clause 6.16 of CSA C22.2 No. 211.0, “General Requirements and Methods of Testing for Nonmetallic Conduit”.
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(1) Optical fibre cables and electrical wires and cables with combustible insulation, jackets or sheathes, located in the space below a raised floor in a computer room, are permitted in a building required to be of noncombustible construction provided they do not convey flame or continue to burn for more than 1 min when tested in conformance with the Vertical Flame Test in Clause 4.11.1. of CSA C22.2 No. 0.3, “Test Methods for Electrical Wires and Cables”, (FT1 Rating). (2) The requirement in Sentence (1) is considered to be met where the wires and cables,
(a) exhibit a vertical char of not more than 1.5 m when tested in conformance with the Vertical Flame Test – Cables in Cabletrough in Clause 4.11.4. of CSA C22.2 No. 0.3, “Test Methods for Electrical Wires and Cables”, (FT4 Rating), or
(b) exhibit a flame-spread of not more than 1.5 m, a smoke density of not more than 0.5 at peak optical density and a smoke density not more than 0.15 at average optical density when tested in conformance with the Flame and Smoke Test in the Appendix to CSA C22.2 No. 0.3, “Test Methods for Electrical Wires and Cables”, (FT6 Rating).
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(1) Combustible fittings and components in a public pool or public spa, including main drains, piping, skimmers, return inlets, steps, ladder rungs and liners, are permitted in a building required to be of noncombustible construction.
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(1) Except as permitted in Sentence (2), exterior marquees, not greater than 7.5 m from ground level to the top of the marquee, having combustible elements, other than fabrics or films conforming to Sentence 3.1.16.1. (1), are permitted on a building required to be of noncombustible construction, provided every opening in the exposed wall of the building above the marquee is protected with wired glass in accordance with MMAH Supplementary Standard SB-2, “Fire Performance Ratings” where these openings are within,
(a) 4.5 m horizontally of the marquee, and
(b) 9 m vertically above the marquee. (2) The protection required by Sentence (1) is permitted to be waived if the building is sprinklered.
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(1) In a building required to be of noncombustible construction, a mezzanine located within a live/work unit is permitted to be of combustible construction, provided the area of the mezzanine is not more than 25% of the floor area of the live/work unit or 20 m2, whichever is less, and has no obstructions more than 1 070 mm above the floor.
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(1) Wood decorative cladding is permitted to be used on exterior marquee fascias, of a storey having direct access to a street or access route, of a building required to be of noncombustible construction, provided the cladding is fire-retardant treated wood that, before testing to CAN/ULC-S102, “Test for Surface Burning Characteristics of Building Materials and Assemblies”, has been conditioned in conformance with ASTM D2898, “Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing”.
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(1) Combustible roof covering that has an A, B or C classification determined in conformance with Subsection 3.1.15. is permitted on a building required to be of noncombustible construction. (2) Combustible roof sheathing and roof sheathing supports installed above a concrete deck are permitted on a building required to be of noncombustible construction provided,
(a) the concrete deck is not less than 50 mm thick,
(b) the height of the roof space above the deck is not more than 1 000 mm,
(c) the roof space is divided into compartments by fire blocks in conformance with Article 3.1.11.5.,
(d) openings through the concrete deck, other than for noncombustible roof drains and plumbing piping, are protected by masonry or concrete shafts,
(i) constructed as fire separations having a fire-resistance rating not less than 1 h, and
(ii) extending from the concrete deck to not less than 150 mm above the adjacent roof sheathing,
(e) the perimeter of the roof is protected by a noncombustible parapet extending from the concrete deck to not less than 150 mm above the adjacent sheathing, and
(f) except as permitted by Clause (d), the roof space does not contain any building services. (3) Combustible cant strips, roof curbs, nailing strips and similar components used in the installation of roofing are permitted on a building required to be of noncombustible construction. (4) Wood nailer facings to parapets, not more than 600 mm high, are permitted on a building required to be of noncombustible construction, if the facings and any roof membranes covering the facings are protected by sheet metal.
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(1) Combustible skylight assemblies are permitted in a building required to be of noncombustible construction if the assemblies have a flame-spread rating not more than,
(a) 150, provided the assemblies,
(i) have an individual area not more than 9 m2,
(ii) have an aggregate horizontal projected area of the openings through the ceiling not more than 25% of the area of the ceiling of the room or space in which they are located, and
(iii) are spaced not less than 2 500 mm from adjacent assemblies and 1 200 mm from required fire separations, or
(b) 75, provided the assemblies,
(i) have an individual area not more than 27 m2,
(ii) have an aggregate horizontal projected area of the openings through the ceiling not more than 33% of the area of the ceiling of the room or space in which they are located, and
(iii) are spaced not less than 1 200 mm from adjacent assemblies and from required fire separations. (2) Combustible vertical glazing installed no higher than the second storey is permitted in a building required to be of noncombustible construction. (3) Except as permitted by Sentence (4), the combustible vertical glazing permitted by Sentence (2) shall have a flame-spread rating not more than 75. (4) The flame-spread rating of combustible glazing in Sentence (2) is permitted to be not more than 150 if the aggregate area of glazing is not more than 25% of the wall area of the storey in which it is located, and,
(a) the glazing is installed in a building not more than 1 storey in building height,
(b) the glazing in the first storey is separated from the glazing in the second storey in accordance with the requirements of Article 3.2.3.17. for opening protection, or
(c) sprinklers are installed in,
(i) any storey with combustible glazing, and
(ii) the storey immediately above the storey with combustible glazing. (5) Combustible window sashes and frames are permitted in a building required to be of noncombustible construction provided,
(a) each window in an exterior wall face is an individual unit separated by a wall of noncombustible construction from every other opening in the exterior wall,
(b) windows in exterior walls in contiguous storeys are separated by not less than 1 000 mm of noncombustible construction, and
(c) the aggregate area of openings in an exterior wall face of a fire compartment is not more than 40% of the area of the wall face.
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(1) Except as provided in Sentences (2) and (4), combustible components are permitted to be used for an exterior non-loadbearing wall assembly in a building required to be of noncombustible construction, provided that,
(a) the building is,
(i) not more than 3 storeys in building height, or
(ii) not more than 6 storeys in building height if sprinklered,
(b) when tested in accordance with CAN/ULC-S134, "Fire Test of Exterior Wall Assemblies", the wall assembly satisfies the following criteria for testing and conditions of acceptance:
(i) flaming on or in the wall assembly does not spread more than 5 m above the opening, and
(ii) the heat flux during the flame exposure on the wall assembly is not more than 35 kW/m2 measured at 3.5 m above the opening, and
(c) the interior surfaces of the wall assembly are protected by a thermal barrier conforming to Sentence 3.1.5.12. (5). (2) Except as permitted by Articles 3.2.3.10. and 3.2.3.11., where the limiting distance in Tables 3.2.3.1.B. to 3.2.3.1.E. permits an area of unprotected openings of not more than 10% of the exposing building face, the construction requirements of Table 3.2.3.7. shall be met. (3) A wall assembly permitted by Sentence (1) that includes combustible cladding of fire-retardant treated wood shall be tested for fire exposure after the cladding has been subjected to an accelerated weathering test as specified in ASTM D2898, “Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing”. (4) The requirements of this Article do not apply where foamed plastic insulation is used in an exterior wall assembly of a building and the insulation is protected in conformance with Sentences 3.2.3.8. (1) and (2).
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(1) Wood nailing elements attached directly to or set into a continuous noncombustible backing for the attachment of interior finishes, are permitted in a building required to be of noncombustible construction provided the concealed space created by the wood elements is not more than 50 mm thick.
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(1) Combustible millwork, including interior trim, doors and door frames, show windows together with their frames, aprons and backing, handrails, shelves, cabinets and counters, is permitted in a building required to be of noncombustible construction.
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(1) Combustible stage flooring supported on noncombustible structural members is permitted in a building required to be of noncombustible construction. (2) Wood members more than 50 mm but not more than 375 mm high applied directly to or set into a noncombustible floor slab are permitted for the construction of a raised platform in a building required to be of noncombustible construction provided the concealed spaces created are divided into compartments by fire blocks in conformance with Sentence 3.1.11.3. (2). (3) The floor system for the raised platform referred to in Sentence (2) is permitted to include combustible subfloor and combustible finished flooring. (4) Combustible finished flooring is permitted in a building required to be of noncombustible construction.
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(1) Combustible stairs are permitted in a dwelling unit in a building required to be of noncombustible construction.
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(1) Unless otherwise permitted by Articles 3.2.2.20. to 3.2.2.83., a roof assembly in a building up to 2 storeys in building height is permitted to be of heavy timber construction regardless of building area or type of construction required, provided the building is sprinklered. (2) If Sentence (1) permits a roof assembly to be of heavy timber construction, structural members in the storey immediately below the roof assembly are permitted to be of heavy timber construction.