The Ontario Building Code | Penetration of Fasteners
9.27.5.7. Penetration of Fasteners
(1) Fasteners for shakes and shingles shall penetrate through the nail-holding base or not less than 19 mm into the framing.
(2) Fasteners for cladding other than that described in Sentence (1) shall penetrate through the nail-holding base or not less than 25 mm into the framing.
9.27.6. Lumber Siding
In Plain Language
Fastener penetration into the framing or sheathing behind the cladding must meet the minimum depth set out in this article, ensuring secure attachment.
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.