How often should you reseal a deck?
Updated July 2026
A wood deck should be resealed or restained every 2 to 3 years, and yearly if you use a clear sealer or the deck bakes in unshaded sun. The fastest way to know for sure is the sprinkle test: flick water onto the boards and watch. Beads mean the finish is still shedding water; soaking straight in means the wood is thirsty and the seal has worn off. Left bare, decking grays, cups, cracks, and eventually rots from the top down.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Clear or "natural" sealer | Yearly | No pigment means no UV block, so it wears off fast |
| Semi-transparent stain | Every 2–3 years | A little pigment buys real UV protection |
| Solid-color stain | Every 3–5 years | Full pigment lasts longest but hides the grain |
| Full-sun, south-facing deck | Toward the 2-year mark | UV is the main thing breaking the finish down |
| Shaded or covered deck | Toward the 3-year mark | Less sun, but watch for mildew in the damp |
| Brand-new pressure-treated boards | Wait until water soaks in | Fresh lumber is too wet and waxy to take a finish |
The cost of skipping it
What skipping it costs: a finish is what keeps water and UV out of the wood. Let it lapse and the surface grays and fuzzes, boards cup and split, fasteners loosen, and rot creeps into the joists and ledger. A can of quality stain runs $35 to $60 and covers 200 to 300 square feet, so resealing a typical deck is a $100 to $300 weekend. Compare that to replacing failed boards at $30 to $60 a square foot installed, or a full structural rebuild that climbs into the $4,000–12,000 range.
How to do it (A weekend · DIY, or $2–5 per sq ft for a pro)
- Clear the deck and check the weather: you want 2 dry days and mild temperatures.
- Clean with a deck cleaner or brightener and a stiff brush, then rinse and let it dry 24–48 hours.
- Sand any rough or splintered spots and sweep off the dust.
- Run the sprinkle test on a dry board to confirm the old finish is truly gone.
- Apply stain or sealer with a pad or roller, working a few boards at a time and backbrushing to avoid lap marks.
- Keep foot traffic and furniture off until it cures, usually 24–48 hours.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing deck resealing schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
How do I know if my deck actually needs resealing?
Use the sprinkle test: drip water on several spots around the deck, especially the high-traffic and sun-exposed boards. If it beads and sits on top, the seal is intact and you can wait. If it darkens the wood and soaks in within a minute, the finish has worn through and water is reaching the fibers. Graying, a chalky look, or a fuzzy surface texture all point the same way. Test in a couple of spots, since sun-facing boards wear out first.
What is the difference between deck stain and deck sealer?
Sealer is usually clear and waterproofs the wood but adds little UV protection, so it needs redoing yearly. Stain carries pigment, and that pigment is what blocks the sun that grays and cracks the boards. The more pigment (from clear to semi-transparent to solid), the longer it lasts and the more it hides the grain. Most decks do best with a semi-transparent stain: 2 to 3 years of protection while still showing the wood.
Do I have to strip the old finish before resealing?
Not always. If you are reapplying a penetrating semi-transparent stain and it has simply worn thin, a good cleaning and a light sand is enough. You need to strip when the old finish is a film-forming solid stain that is peeling, or when you are switching from a solid to a semi-transparent look. Stripping is the messiest part of the job, which is one reason many pros steer homeowners toward penetrating stains that reapply cleanly.
Does a composite or PVC deck need sealing too?
No. Composite and PVC boards do not absorb water the way wood does, so they never need staining or sealing, just washing. What they do need is airflow and cleaning, since trapped debris grows surface mold, and most makers void warranties on paints and sealers. If you have a wood deck, resealing is non-negotiable; if it is composite, put that time into a yearly wash and a look at the framing instead. See how often to inspect a deck.