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 | Metal Liners

9.21.3.6. Metal liners

(1) Metal liners shall be constructed of at least 0.3 mm thick stainless steel.

(2) Except as provided in Sentence 9.22.10.2.(3), metal liners referred to in Sentence (1) shall only be used in chimneys serving gas- or oil-burning appliances.

In Plain Language

This clause specifies metal chimney liners must be at least 0.3 mm thick stainless steel, and (with one narrow exception) these metal liners can only be used in chimneys serving gas- or oil-burning appliances, not solid-fuel ones.

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.