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

3.1.10.5.Maximum Openings

(1) Openings in a firewall shall conform to the size limits described in Article 3.1.8.6. (2) The aggregate width of openings in a firewall within a storey shall be not more than 25% of the entire length of the firewall.
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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.