The Ontario Building Code | Roofs Supporting an Occupancy
9.10.8.7. Roofs supporting an Occupancy
(1) Where a portion of a roof supports an occupancy, that portion shall be constructed as a fire separationhaving a fire-resistance rating conforming to the rating for "floors Except floors over Crawl Spaces" in Table 9.10.8.1.
In Plain Language
Roofs that support an occupancy, such as a rooftop patio or mechanical room with regular access, have specific fire-resistance requirements set out in this article.
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.