The Ontario Building Code | Fire-Resistance and Fire-Protection Ratings
9.10.3.1. Fire-Resistance and Fire-Protection Ratings
(1) Where a fire-resistance rating or a fire-protection rating is required in this Section for an element of a building, such rating shall be determined in conformance with the test methods described in Part 3, or in accordance with MMAH Supplementary Standard SB-2, "Fire Performance Ratings", or MMAH Supplementary Standard SB-3, "Fire and Sound Resistance of Building Assemblies".
In Plain Language
Building elements must achieve the fire-resistance and fire-protection ratings set out in this article, meaning how long they can withstand fire exposure before failing structurally or letting fire pass through.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.