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

9.10.8.1.Fire-Resistance Ratings for Floors and Roofs

(1) Except as otherwise provided in this Subsection, the fire-resistance ratings of floors and roofs shall conform to Table 9.10.8.1. (See Subsection 9.10.2. for mixed occupancies and Subsection 9.10.21. for construction camps.) Table 9.10.8.1. Fire Resistance Ratings for Floors and Roofs Forming Part of Sentence 9.10.8.1.(1) Minimum Fire-Resistance Rating by Building Element, min Maximum Building Major Occupancy Floors Except Floors over Height, Storeys Mezzanine Floors Roofs Crawl Spaces Residential (Group C) 3 45 45 — 2 45 — — All other occupancies 3 45 45 45

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.