Code Library › Volume 1 › Section 3.1 — General
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.1.5.6.Combustible Components in Exterior Walls

(1) Combustible components, other than those permitted by Article 3.1.5.5. and Sentence 3.1.5.7.(2), are permitted to be used in an exterior wall assembly of a building required to be of noncombustible construction, provided (a) the building is (i) not more than 3 storeys in building height, or (ii) sprinklered throughout, and (b) the wall assembly (i) except as provided in Sentence (2), satisfies the criteria of Clause 3.1.5.5.(1)(b), or (ii) is protected by masonry or concrete cladding not less than 25 mm thick. (See Note A-3.1.5.5.(1)(b)) (2) Exterior wall assemblies constructed in accordance with Section 6 of MMAH Supplementary Standard SB-2, “Fire Performance Ratings” are deemed to comply with Subclause (1)(b)(i).
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.