Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Steel Liners

9.22.2.3. Steel liners

(1) Steel liners for fireplaces shall conform to CAN/ulc-S639M, "Steel liner Assemblies for Solid-Fuel Burning masonry Fireplaces", and shall be installed in accordance with the installation instructions in that standard.

9.22.3. fireplace Walls

In Plain Language

Steel liners for a fireplace have their own specific requirements set out in this article, an alternative to firebrick lining.

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.