The Ontario Building Code | Attachment of Cladding to Sheathing
9.23.16.3. Attachment of Cladding to Sheathing
(1) gypsum sheathing, rigid insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation and fibreboard shall not be used for the attachment of siding materials.
(2) Nails used in attaching the materials listed in Sentence (1) shall be not less than 3.2 mm diam with a minimum head diameter of 11 mm.
In Plain Language
Cladding must be properly attached to the sheathing beneath it, as set out in this article, ensuring the exterior finish stays securely fastened.
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.