In Plain Language

Spaces around a chimney where it passes through floors or walls must be sealed as set out in this article, addressing both fire safety and air leakage at this penetration.

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.