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Marine plywood collectionFor sustained water exposure beyond what pressure treatment offers, marine plywood uses a void-free core and WBP glue line to resist delamination.
Film-faced plywood rangeWBP-bonded panels with a phenolic face, built for concrete formwork and exterior structural work where the panel must resist moisture by construction.
Choosing plywood for outdoor useCompare pressure treated, marine, and exterior-glued panels side by side to match the panel to the exposure.
How to seal and protect plywood against moistureEdge sealing and finishing steps that extend the outdoor life of any plywood, including treated panels.
What marine-grade plywood isA closer look at the WBP construction and void-free core that separate marine plywood from a preservative-treated softwood board.

Quick Answers

Is plywood pressure treated?
Most plywood is not pressure treated. Standard interior, structural, and film-faced panels ship untreated. Pressure treated plywood is a separate product deliberately infused with preservative under pressure for ground-contact or exposed outdoor use. If a panel's grade stamp does not name a preservative and retention level, assume it is untreated.
What is the difference between pressure treated and marine plywood?
They resist different threats. Pressure treated plywood is chemically infused to resist rot, decay, and insects, but it may use a standard softwood core with some voids. Marine plywood is built with a void-free core and a weather-and-boil-proof (WBP) glue line to resist delamination under sustained water exposure. Marine is the better choice for boats, docks, and permanent wet exposure; pressure treated is more cost-effective for decking, fences, and ground-contact framing.
How long does pressure treated plywood last outdoors?
With the right retention rating for its position and reasonable maintenance, pressure treated plywood commonly lasts 20 to 30 years or more outdoors. Ground-contact-rated panels in constant soil contact sit at the upper end. Resealing cut edges, reapplying a water repellent every couple of years, and detailing for drainage all extend the service life.
Can you paint or stain pressure treated plywood?
Yes, but only once the panel is fully dry. Freshly treated plywood holds a lot of moisture from the treatment process and needs to dry before it will hold a finish. Test by sprinkling water on the surface; if it beads, the panel is still too wet. Once dry, use an exterior-grade primer with acrylic latex paint, or a penetrating stain rated for treated wood.