Application Guide · Exterior
Plywood for Outdoor Use
Sun, rain and temperature swings are far harsher on plywood than anything it faces indoors — which is why outdoor use, including outdoor furniture, calls for a different grade than standard interior work.
Four Steps to Plywood That Survives Outdoors
Start With Marine or BWP Grade
BWP grade passes a 72-hour boiling water test — the baseline for anything that will face sustained rain and humidity outdoors.
Add a Weatherproof Finish
Exterior-grade varnish or paint on top of the right core grade protects against UV fading and rain far better than the core alone.
Seal Every Cut Edge
Cut edges are the most porous part of any sheet, and outdoors they're exposed to far more direct water than an indoor panel ever sees.
Consider Placement
A covered patio piece can get away with less protection than something fully exposed to direct sun and rain — match the grade and finish to actual exposure.
Outdoor Furniture Specifically
Garden benches, outdoor tables and planters built from BWP-grade plywood with a properly sealed finish can last for years outdoors, where standard interior-grade plywood would swell and delaminate within a season. The combination that matters most is BWP core plus a genuinely weatherproof topcoat — either alone leaves a gap in protection.
Related Grade Choices
See our marine plywood guide for more on BWP grade specifically, our MR vs BWR vs BWP grade guide for the full grading picture, and our how to seal plywood guide for edge-sealing technique.
Frequently Asked Questions
What grade of plywood should be used outdoors?
Marine or BWP (boiling waterproof) grade is the recommended starting point for any outdoor application, since it's tested to withstand sustained water exposure far better than standard MR-grade plywood.
Can outdoor furniture be made from plywood?
Yes — BWP-grade plywood with a properly sealed, weatherproof finish holds up well for garden furniture and similar outdoor pieces, lasting years where standard plywood would fail within a season.
Does BWP grade alone protect plywood outdoors?
It's a strong foundation, but pairing BWP grade with a weatherproof topcoat and sealed cut edges gives much better long-term protection than the core grade alone.
How often does outdoor plywood need refinishing?
Depending on sun and rain exposure, refinishing every one to two years helps outdoor plywood maintain its protective topcoat and reach the top end of its expected lifespan.
Is standard interior plywood suitable for a covered outdoor area?
Even in a covered area, ambient humidity and temperature swings are harsher than indoors, so BWP or at minimum BWR grade is still recommended over standard interior plywood.
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