The Ontario Building Code | Material Standards
188.8.131.52. 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".
(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