3.1.7.3. Exposure Conditions for Rating

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3.1.7.3. Exposure Conditions for Rating

1) Floor, roof and ceiling assemblies shall be rated for exposure to fire on the underside.

2) Firewalls and interior vertical fire separations shall be rated for exposure to fire on each side.

3) Exterior walls shall be rated for exposure to fire from inside the building.

3.1.5.24. Decorative Wood Cladding

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3.1.5.24. Decorative Wood Cladding

1) On buildings required to be noncombustible construction, decorative wood cladding is permitted to be used on the exterior fascias and soffits of marquees or canopies on the building face of a storey having direct access to a street or access route, provided the wood cladding is fire-retardant-treated wood that has been conditioned in conformance with ASTMD 2898, " Accelerated Weathering of Fire -Retardant-Treated Wood for Fire Testing," before being tested in accordance with CAN/ULC-S102, "Test for Surface Burning Characteristics of Building materials and Assemblies."

3.1.5.20. Combustible Plumbing Fixtures

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3.1.5.20. Combustible Plumbing Fixtures

1) Combustible plumbing fixtures, including wall and ceiling enclosures that form part of the plumbing fixture, are permitted in a building required to be of noncombustible construction provided they are constructed of material having a flame-spread rating and smoke developed classification not more than that permitted for the wall surface of the room or space in which they are installed.

3.1.5.19. Combustible Piping Materials

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3.1.5.19. Combustible Piping Materials

1) Except as permitted by Clause 3.1.5.2.(1)(d) and Sentence (2) and (3), 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 Section 3.2.6., have a smoke developed classification not more than 50.

3.1.5.18. Combustible Ducts

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3.1.5.18. Combustible Ducts

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 tap, pipe insulation and pipe coverings are permitted to be used in a building required to be noncombustible construction provided they conform to the appropriate requirements of subsection 3.6.5.

3) In a building required to be of noncombustible construction, combustible ducts need not comply with the requirements of Sentence 3.6.5.1.(1) and (2) provided the ducts are

a)part of a duct system conveying only ventilation air, and

b)contained entirely within a dwelling unit.

9.10.13.2. Solid Core Wood Door as a Closure

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9.10.13.2. Solid Core Wood Door as a Closure

1) A 45mm thick solid core wood door is permitted to be used where a minimum fire-protection rating of 20 min is permitted or between a public corridor and a suite provided that the door conforms to CAN/ULC-S113, "Wood Core Doors Meeting the Performance Required by CAN/ULC-S104 for Twenty Minute Fire Rated Closure Assemblies."

2) Doors described in Sentence (1) shall have not more than a 6 mm clearance beneath and not more than 3 mm at the sides and top.

3.1.8.12. Twenty-Minute Closures

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3.1.8.12. Twenty-Minute Closures

1) A door assembly having a fire-protection rating not less than 20 min is permitted to be used as a closure in

a) a fire separation not required to have a fire resistance rating more than 1 h, located between

i) a public corridor ans a suite,

ii) a corridor and adjacent sleeping rooms, or

iii) a corridor and adjacent classrooms, offices and libraries in Group A, Division 2 major occupancies, or

b) a fire separation not required to have a fire-resistance rating more than 45 min, located in a building not more than 3 storeys in building height.

2) The requirements for noncombustible sills and combustible floor coverings in NFPA 80, "Fire Doors and Other Opening Protectives," do not apply to a door described in Sentence (1)

3) A door described in Sentence (1) shall have clearances of not more than 6 mm at the bottom and not more than 3 mm at the sides and top.