(1)  OSB, waferboard and plywood used for roof sheathing, wall sheathing and subflooring 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.

Article Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.