PART 2 — RESERVEDUpdated for the 2024 Ontario Building Code
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2.2.1.10.Determination of Fire-Resistance Ratings
(1) Except as permitted by Sentence (2), the rating of a material, assembly of materials, or structural member that is
required to have a fire-resistance rating shall be determined on the basis of the results of tests conducted in conformance
with CAN/ULC-S101, “Standard Method of Fire Endurance Tests of Building Construction and Materials.”
(2) A material, assembly of materials, or structural member is permitted to be assigned a fire-resistance rating on the
basis of MMAH Supplementary Standard SB-2, “Fire Performance Ratings.”
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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.