A timber deck beside a swimming pool gets a tougher workout than a sheltered entertaining deck. It is exposed to sun, rain and splashes, and people often walk across it with wet feet. If the boards have faded, become patchy or lost their water-repellent finish, a careful restoration can bring the timber back without rushing straight to replacement.
The key is preparation. Poolside timber should be cleaned, dried and sanded in a controlled sequence before a suitable exterior finish is applied. The right approach depends on the timber, the existing coating, the deck’s condition and the manufacturer’s directions for both cleaners and finishes.
Start with a close inspection
Before washing or sanding, check the boards, joists where accessible, stairs, edges and fixings. Look for soft or split timber, raised screws, loose boards, cupping, mould, slippery build-up and areas where water sits. Cosmetic restoration will not correct a structural problem, so damaged or unstable sections need proper assessment first.
Also note how water drains away from the house and pool. Clear leaves and debris from gaps and drainage paths. Avoid assuming every dark patch is just old stain; persistent dampness can point to poor airflow or drainage that should be addressed before refinishing.
Remove the old coating and clean thoroughly
If the previous stain or oil is peeling, built up or uneven, applying another coat over it can leave a blotchy result. A compatible deck stripper may help loosen old coating, but it needs to be selected and used according to its label. Protect nearby plants, metalwork, glass and pool water from run-off and splashes. Keep cleaning products out of the pool, and follow the product’s containment and rinse instructions.
After stripping, wash the deck to remove residue and embedded dirt. Pressure cleaning must be controlled: excessive pressure or holding the nozzle too close can fur the grain, cut soft timber and leave visible wand marks. Use the lowest effective pressure, suitable equipment and an even technique. A final lower-pressure rinse can remove loosened residue without needlessly damaging the surface.
Let the boards dry completely
Drying is a real part of the job, not a box to tick quickly. Moisture trapped in the boards can interfere with sanding and prevent oil from penetrating consistently. Drying time varies with timber species, weather, shade, airflow and board thickness. Follow the coating manufacturer’s moisture and weather requirements rather than relying on a fixed number of hours.
Choose a forecast that allows the deck to dry and the finish to cure without rain or heavy dew. Pool use may also need to pause while cleaning products are rinsed away and the final coating cures, as directed by the product manufacturer.
Sand in stages for an even surface
Once dry, sand the full deck evenly to remove weathered fibres and remaining coating, taking care around fixings, edges and door thresholds. A coarser first pass can expose sound timber where the surface needs it; then a finer pass helps refine the grain and produce a smoother feel. The appropriate grits depend on the timber and its condition. For example, some restoration jobs use an initial 80-grit pass followed by a finer 180 to 240-grit finish, but that is not a universal specification.
Vacuum or sweep away sanding dust thoroughly. Dust left in gaps or on the boards can mix into the finish and spoil the appearance. If the sanding exposes damaged boards or deep defects, deal with those before coating rather than trying to hide them with oil.
Choose and apply a finish for the setting
Use an exterior deck oil or finish suitable for the timber and the poolside exposure, and follow its instructions for preparation, coverage, application and recoating. Test the colour on an inconspicuous area first, because timber species, previous coatings and sanding can all affect the final shade. Apply thin, even coats and remove excess as directed. Puddles or heavy build-up can dry unevenly and become tacky.
Pool decks can become slippery when wet, but no finish should be described as making a surface automatically slip-proof. Keep the boards clean, attend to algae or organic build-up promptly, and ask about suitable surface options if traction is a concern. Good drainage, sound boards and regular cleaning matter alongside the finish.
Keep the restored deck looking its best
Once the coating has cured, follow the product guidance for returning furniture and foot traffic. Rinse off pool splashes and debris as part of routine care, and inspect the surface periodically for fading, wear and water pooling. Recoat when the timber and product guidance indicate it is due, rather than waiting until the finish has failed across the whole deck.
Every pool surround is different, so a restoration plan should be based on an on-site assessment, not just a photo. If you are weighing up repairs, sanding or replacement, contact 5 Star Decking to discuss your Sydney deck. Call 0433 334 415. NSW contractor licence: 395250C.
