The Ontario Building Code | Spacing and Joints
9.26.9.4. Spacing and Joints
(1) Shingles shall be spaced approximately 6 mm apart and offset at the joints in adjacent courses not less than 40 mm so that joints in alternate courses are staggered.
In Plain Language
Spacing and joints between wood shingles or shakes must meet the requirements set out in this article, allowing for natural wood expansion while still shedding water.
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.