Use Tolko plywood panels for projects that require water-resistant subflooring and underlayment. The exterior waterproof glue on these 1/2 in x 4 ft x 8 ft panels adds a layer of water protection to foundations and joists. The Select plywood series offers its users the flexibility of installation under various weather conditions without concern about compromising the quality of the panels. They're suitable as substrates for low- and high-pressure laminates, side panels and soffit stocks. They also protect studs and the interior from water damage. The Tolko Douglas fir plywood provides a high strength-to-weight ratio that helps fortify a structure without adding too much weight. Panels produced in Canada from Canadian Douglas fir. Panels come with a 25-year limited warranty.