The Ontario Building Code | OSB, Waferboard and Plywood Marking
9.3.2.4. OSB, waferboard and Plywood Marking
(1) OSB, waferboard and plywood used for roof sheathing, wall sheathing and subflooring="http://thehandyforce.com/flooring/" title ="Handyman flooring install Toronto">flooring shall be legibly identified on the face of the material indicating,
(a) the manufacturer of the material,
(b) the standard to which it is produced, and
(c) that the material is of an exterior type.
In Plain Language
OSB, waferboard, and plywood panel products must be marked as set out in this article, identifying their grade and suitability for the intended structural use.
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.