The Ontario Building Code | Wood Decorative Cladding
3.1.5.25. wood Decorative Cladding
(1) wood decorative cladding is permitted to be used on exterior marquee fascias, of a storey having direct access to a street or access route, of a building required to be of noncombustible construction, provided the cladding is fire-retardant treated wood that, before testing to CAN/ulc-S102, "Test for surface Burning Characteristics of Building Materials and Assemblies", has been conditioned in conformance with ASTM D2898, "Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing".
In Plain Language
Wood decorative cladding is allowed on exterior marquee fascias of street-facing storeys in noncombustible-construction buildings, provided it's fire-retardant treated wood that's been weathering-conditioned per ASTM D2898 before its fire-spread testing.
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.