Code Library › Volume 1 › Section 9.18 — Crawl Spaces
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.18.1.3.Heated and Unheated Crawl Spaces

(1) Crawl spaces shall be considered to be heated where the space (a) is used as a warm air plenum, (b) contains heating ducts or heating pipes that are not sealed and insulated to minimize heat loss to the space, or (c) is not separated from heated space in accordance with Section 9.25. (2) Heating of heated crawl spaces shall conform to Section 9.33. (3) Insulation, an air barrier system and a vapour barrier shall be installed in the walls of heated crawl spaces in accordance with Section 9.25.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.