The Ontario Building Code | Combustible Projections
3.1.10.7. Combustible Projections
(1) Combustiblematerial shall not extend across the end of a firewallbut is permitted to extend across a roof above a firewallthat is terminated in conformance with Sentence 3.1.10.3.(2).
(2) If buildings are separated by a firewall, combustibleprojections on the exterior of one building, including balconies, platforms, canopies, eave projections and stairs, that extend outward beyond the end of the firewall, shall not be permitted within 2.4 m of combustible projections and window or door openings of the adjacent building.
3.1.11. Fire Blocks in Concealed Spaces
In Plain Language
Combustible material cannot extend across the end of a firewall (though it may cross above a properly terminated firewall on the roof), and combustible projections like balconies or canopies on one building can't come within 2.4 m of similar projections or window/door openings on the building across the firewall.
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.