The Ontario Building Code | Fire-Resistance Ratings for Walls, Columns and Arches
9.10.8.3. Fire-Resistance Ratings for Walls, Columns and Arches
(1) Except as otherwise provided in this Subsection, all loadbearing walls, columns and arches in the storey immediately below a floor or roof assembly shall have a fire-resistance rating of not less than that required for the supported floor or roof assembly.
In Plain Language
Walls, columns, and arches must achieve the fire-resistance ratings set out in this article, covering the key vertical structural and separating elements in a building.
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.