Code Library › Volume 1 › Section 9.10 — Fire Protection
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.10.16.2.Required Fire Blocks in Wall Assemblies

(1) Except as permitted in Sentence (2), fire blocks shall be provided to block off concealed spaces within wall assemblies, including spaces created by furring, (a) at each floor level, (b) at each ceiling level where the ceiling contributes to part of the required fire-resistance rating, and (c) at other locations within the wall, so that the distance between fire blocks does not exceed 20 m horizontally and 3 m vertically. (2) Fire blocks described in Sentence (1) are not required, provided (a) the insulated wall assembly contains not more than one concealed air space whose horizontal thickness is not more than 25 mm, (b) the exposed construction materials within the space are noncombustible, or (c) the exposed construction materials within the space, including insulation, but not including wiring, piping or similar services, have a flame-spread rating of not more than 25, or (d) the concealed wall space is filled with insulation.
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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.