The Ontario Building Code | Heavy Timber Roof Permitted
3.2.2.16. Heavy Timber Roof Permitted
(1) Unless otherwise permitted by Articles 3.2.2.20. to 3.2.2.83., a roof assembly in a building up to 2 storeys in building height is permitted to be of heavy timber constructionregardless of building area or type of construction required, provided the building is sprinklered.
(2) If Sentence (1) permits a roof assembly to be of heavy timber construction, structural members in the storey immediately below the roof assembly are permitted to be of heavy timber construction.
In Plain Language
A heavy timber roof is allowed on sprinklered buildings up to 2 storeys regardless of the building's area or otherwise-required construction type, and where that's permitted, the structural members in the storey right below the roof can also be heavy timber.
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.