The Ontario Building Code | Extension of Chimney Liners
9.21.3.10. Extension of Chimney liners
(1) Chimney liners shall extend from a point not less than 200 mm below the lowest flue pipe connection to a point not less than 50 mm or more than 100 mm above the chimneycap.
9.21.4. masonry and Concrete Chimney Construction
In Plain Language
Chimney liners must extend a specific distance as set out in this article, ensuring the liner protects the full height it's needed for.
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.