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 | Concrete Liners

9.21.3.5. Concrete liners

(1) Concreteflue liners shall conform to Clause 4.2.6.4. of CAN/CSA-A405-M, "design and Construction of masonry Chimneys and fireplaces".

In Plain Language

Concrete liners must meet the requirements set out in this article, an alternative lining material to clay or firebrick.

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.