The Ontario Building Code | Screws, Bolts, Nuts and Washers
7.2.10.2. Screws, Bolts, Nuts and Washers
(1) Every screw, bolt, nut and washer shall be of materials that are resistant to corrosion, when used,
(a) to connect a water closet to a water closet flange,
(b) to anchor the water closet flange to the floor,
(c) to anchor the water closet to the floor, or
(d) to hold cleanoutcovers or floor drain grates.
In Plain Language
Every screw, bolt, nut, and washer used to connect plumbing components must be made of corrosion-resistant materials when used in the specific connection applications described 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.