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

9.10.11.2.Firewalls Not Required

(1) A party wall on a property line of a building of residential occupancy need not be constructed as a firewall, provided it is constructed as a fire separation having not less than a 1 h fire-resistance rating, where the party wall separates (a) two dwelling units where there is no dwelling unit above another dwelling unit, (b) a dwelling unit and a house with a secondary suite including their common spaces, or (c) two houses with a secondary suite including their common spaces. (2) Reserved. (3) The wall described in Sentence (1) shall provide continuous protection from the top of the footings to the underside of the roof deck. (4) Any space between the top of the wall described in Sentence (1) and the roof deck shall be tightly filled with mineral wool or noncombustible material.
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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.