The Ontario Building Code | Crawl Spaces
188.8.131.52. Crawl Spaces
(1) For the purposes of Articles 184.108.40.206. and 220.127.116.11., a crawl space shall be considered as a basement if it is,
(b) used for any occupancy,
(c) used for the passage of flue pipes, or
(d) used as a plenumin combustible construction.
(2) A floor assembly immediately above a crawl space is not required to be constructed as a fire separation and is not required to have a fire-resistance rating provided the crawl space is not required to be considered as a basementby Sentence (1).