The Ontario Building Code | Exposure
9.26.10.5. Exposure
(1) The exposure of wood shakes shall not exceed,
(a) 190 mm for shakes not less than 450 mm long, and
(b) 240 mm for shakes not less than 600 mm long.
In Plain Language
This clause caps how much wood shakes can be exposed to the weather depending on their length: 190 mm exposure maximum for shakes at least 450 mm long, or 240 mm for shakes at least 600 mm long.
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.