The Ontario Building Code | Crawl Spaces
9.10.8.9. Crawl Spaces
(1) Where a crawl space exceeds 1 800 mm in height or is used for any occupancy or as a plenum in combustible construction or for the passage of flue pipes, it shall be considered as a basement in applying the requirements in Article 9.10.8.1.
In Plain Language
Crawl spaces have fire-resistance related requirements set out in this article, addressing this often-overlooked space beneath a floor.
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.