Pressure-Treated Plywood pressure-treated plywood for use in areas where plywood will be exposed to direct weather or moisture. Typical applications include sidewall sheathing and built-up roof decks. Our pressure-treated plywood is all sheathing-grade (CCX), either Douglas fir or CSP, conforming to CSA plywood standards 0121 and 0151, respectively. This plywood is then pressure-treated with Sienna Brown Micro-Pro MCA preservative. MCA …
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