The Ontario Building Code | Lining Materials
9.21.3.1. Lining Materials
(1) Everymasonry or concrete chimney shall have a lining of clay, concrete, firebrick or metal.
In Plain Language
Chimney lining materials must conform to the standards referenced in this article, ensuring the liner can safely withstand the heat and byproducts of combustion.
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.