Your deck and patio have taken a beating this summer. Sun, humidity, pop-up storms, and the occasional cookout all leave a mark. Late summer into early fall is the sweet spot for getting outdoor wood back in shape, while the weather is still dry enough to clean and seal but cool enough to actually enjoy the work paying off.
The short version: Check your deck for loose boards, popped nails, and wobbly railings. Clean off the mildew that makes shaded boards slippery. Then, if the wood is thirsty, plan to reseal it. Composite decks need cleaning too, just not sealing.
Give it a safety once-over
Before anything else, walk the deck and look for trouble: boards that flex or feel soft, nails or screws working their way up, splinters, and railings that give when you lean on them. A loose railing or a rotted board is the kind of thing you don’t notice until someone leans on it at a party. The North American Deck & Railing Association runs a whole Deck Safety program around exactly these checks.
Clean off the slippery stuff
Shaded sections of a deck grow a thin layer of algae and mildew that gets genuinely slick when it’s wet. That’s a slip hazard, not just a stain. A proper cleaning clears it off and shows you what the wood underneath actually looks like, which tells you whether it needs sealing.
Reseal before the wet season
Wood decks generally need resealing every one to three years, depending on sun exposure and how they’ve held up. A quick test: sprinkle water on the boards. If it soaks in instead of beading up, the wood is due. Sealing before the wet fall and winter months helps keep moisture out and slows the gray, weathered look. Always clean first and let it dry, since sealing over dirt just traps it.
Don’t forget composite and fences
Composite decking won’t need sealing, but it still collects mildew in the grooves and needs a gentle wash to stay looking right. Wood fences age the same way decks do, going gray and growing mildew on the shaded side, and they respond well to the same clean-and-seal approach.
Helpful resources
- NADRA: Deck Safety — what to check on your deck and railings.
- NC State Extension — regional guidance on wood care and outdoor upkeep.
Want it cleaned and ready to seal? 🌳
We clean decks, patios, and fences so they’re safe, bright, and prepped for sealing. Request a free quote or call 704-946-7659.
Frequently asked questions
How often should I reseal my deck?
Most wood decks need resealing every one to three years. If water soaks into the boards instead of beading on top, it’s time.
Is a slippery deck actually dangerous?
Yes. The algae and mildew that build up on shaded boards get slick when wet and are a real slip hazard. Cleaning removes it and restores traction.
Do composite decks need maintenance?
They don’t need sealing, but they still need cleaning. Mildew collects in the grooves, so a gentle wash keeps a composite deck looking its best.