The Ontario Building Code | Clay Liners
9.21.3.3. Clay liners
(1) Clay liners shall conform to CAN/CSA-A324-M, "Clay Flue liners".
(2) liners referred to in Sentence (1) shall be not less than 15.9 mm thick and shall be capable of resisting, without softening or cracking, a temperature of 1100°C.
In Plain Language
Clay liners, a traditional chimney lining material, must meet the requirements set out in this article.
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.