The Ontario Building Code | Combustible Projections
220.127.116.11. Combustible Projections
(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