A deck almost never fails all at once. It fails at one rotted post, one ledger board quietly pulling away from the house, one railing a kid leans on at the wrong moment. The yearly walk-through below takes about an hour on a typical deck, and nearly all of it is looking and poking rather than fixing. Catch the small stuff now and most decks give you decades of service.
Grab every railing section with both hands and push hard, the way a guest leaning back in a chair would. A guardrail should feel like part of the house. If a post flexes at its base, the hardware has loosened or the wood around it has gone soft — tighten or repair it before the season's first cookout, not after. And if that first cookout doubles as the excuse for a new grill, decide the fuel before you buy — our gas grill vs. charcoal grill comparison weighs flavor against running costs and cleanup.
Walk the surface barefoot or in socks if you want the honest report. You'll feel raised screw heads, cupped boards, and splinters your eyes skip over. Drive popped screws back down — or replace them with ones an inch longer that bite fresh wood — and check the joist hangers underneath for rust and missing nails. Hangers installed with the wrong nails, or half of them missing, are common on older decks and cheap to correct.
Clear the gaps. Run a putty knife or the screwdriver between the deck boards and pop out the packed leaves and grit. Debris in the gaps holds water against the wood and feeds rot from the top down.
Sweep, then wet it down. Sweep off loose dirt, then rinse the whole surface with a hose so the cleaner doesn't dry out mid-job.
Scrub with deck cleaner. Apply an oxygen-bleach deck cleaner, give it 10–15 minutes to work, and scrub with a stiff brush along the grain. This kills mildew and lifts the grey, weathered layer far better than water alone.
Rinse before it dries. Rinse section by section. If you use a pressure washer — our pressure washer buying checklist covers safe models and PSI ranges — keep a wide fan tip moving and treat it like rinsing, not stripping.
Most wood decks want a fresh coat of sealer or stain every 1–3 years, depending on the product and how much sun the deck takes. The reliable test isn't the calendar — flick water onto a few boards. If it beads, the old finish is still working. If it soaks in and darkens the wood within a few minutes, the deck is thirsty and ready for a coat. When the test says it's time, the deck staining checklist sequences the wash, the dry window, and the coats so the finish lasts more than one season.
Two timing rules matter more than brand choice. First, seal onto dry wood: give the deck at least 24–48 hours of dry weather after washing, or the finish traps moisture and peels within a season. Second, brand-new pressure-treated lumber usually needs a few months of weathering before it will accept stain evenly. Composite decking skips the sealing entirely — your yearly job there is the structure check plus a wash.
Ignoring the underside. Decks rot from the bottom up, and the top can look fine while joist ends go soft. Ten minutes under the deck with a flashlight is the whole point of the checklist.
Sealing over dirt. Stain applied to a mildewed, unwashed surface seals the grime in and fails early. The cleaning steps aren't cosmetic prep — they're what the finish bonds to.
Caulking the ledger gap shut. A bead of caulk over the ledger-to-house joint hides the leak instead of stopping it. Water needs flashing and an exit path, not a sealant dam.
Letting planters and mats sit wet. Trays, outdoor rugs, and firewood stacks trap moisture against boards for months. Rotate them, or put planters on small risers.
An hour each spring — probe the frame, shake the rails, reset the fasteners, wash, and seal when the water test says so — is nearly all a deck asks for. Fold this list into your summer home maintenance checklist in spring and run the exterior items again alongside the fall home prep checklist, and the deck stops being a repair project and goes back to being the best room of the house.
Every 1–3 years for most sealers and stains — horizontal surfaces wear fastest. Don't go by the calendar alone: if water sprinkled on the boards soaks in instead of beading, it's time, even if the last coat was only a year ago.
A pressure-treated pine deck typically lasts 15–20 years with yearly maintenance, cedar about the same, and composite boards 25 years or more. The frame usually decides the real number — decks that get an annual structure check outlast identical decks that don't.
Yes, with restraint: a wide fan tip (25–40 degrees), modest pressure, the tip kept roughly a foot from the boards and always moving. Used like a rinse aid after scrubbing, it's fine. Used like a stripper at close range, it chews up the grain. The full technique — tip choice, pressure by wood type, and wand distance — is in our walkthrough on how to pressure wash a deck.
Spring, once temperatures stay above about 50°F and you can count on a couple of dry days — warm enough for finishes to cure, early enough that the deck is ready for summer. A quick second look in fall clears the leaf buildup that rots boards over winter.
Replace it, don't patch it. Pry it up, check the joist underneath (that's the rot that matters), and screw down a new board of the same species and thickness. If the probe finds rot in more than a board or two, or anywhere in a post or the ledger, that's a carpenter's job, not a weekend one.