The Ontario Building Code | Fire Blocks in Crawl Spaces
3.1.11.6. Fire Blocks in Crawl Spaces
(1) A crawl space that is not considered as a basementby Article 3.2.2.9. and in which sprinklers are not installed, shall be separated by construction conforming to Article 3.1.11.7. into compartments not more than 600 m2 in area with no dimension more than 30 m.