The Ontario Building Code | Material Standards
9.27.11.1. Material Standards
(1) Horizontal and vertical strip steel siding, including flashing and trim accessories, shall conform to CAN/cgsb-93.4, "Galvanized Steel and Aluminum-Zinc Alloy Coated Steel Siding, Soffits and Fascia, Prefinished, residential".
(2) Steel sheet cladding shall have a minimum thickness of 0.3 mm and conform to CAN/cgsb-93.3-M, "Prefinished Galvanized and Aluminum-Zinc Alloy Steel Sheet for residential Use".
(3) Horizontal and vertical strip aluminum siding, including flashing and trim accessories, shall conform to CAN/cgsb-93.2-M, "Prefinished Aluminum Siding, Soffits and Fascia, for residential Use".
(4) Aluminum sheet cladding shall conform to CAN/cgsb-93.1-M, "Sheet, Aluminum Alloy, Prefinished, residential" and shall have a thickness of not less than 0.58 mm, except that siding supported by backing or sheathing shall have a thickness of not less than 0.46 mm.
9.27.12. Vinyl Siding
In Plain Language
Material standards for this cladding type are set out in this article.
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.