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

9.10.9.4.Floor Assemblies

(1) Except as permitted in Sentences (2) to (4), all floor assemblies shall be constructed as fire separations. (2) Floor assemblies contained within dwelling units need and within houses with a secondary suite need not be constructed as fire separations. (3) Floor assemblies for which no fire-resistance rating is required by Subsection 9.10.8. and floors of mezzanines not required to be counted as storeys in Articles 9.10.4.1. and 9.10.4.2. need not be constructed as fire separations. (4) Where a crawl space is not required by Article 9.10.8.9. to be constructed as a basement, the floor above it need not be constructed as a fire separation.
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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.