Signs your deck needs attention
A deck rarely fails all at once. The early signs are small and easy to ignore until one becomes a trip hazard. Walk the whole deck slowly and look and feel for the following:
- Boards that flex, feel spongy or sound hollow underfoot
- Splits, cracks and grey, crumbling timber at the board ends
- Screw heads standing proud or boards that have lifted at one end
- A green, greasy film that makes the surface slippery
- Any bounce or lean in the deck as a whole, or steps that move
Soft or rotten boards
Boards rot first where water sits: at the cut ends, around screw holes and in shady corners. Press a screwdriver into any suspect board. If it sinks in easily, the timber has gone soft. Single rotten boards can be unscrewed and replaced, but it is worth looking at the joist underneath while the board is up, because a damp board often means a damp joist.
Rotten joists and posts
The joists are the timbers the boards are fixed to, and the posts or bearers hold them up. These are the parts that decide whether a deck can be saved. With a board or two lifted, test the joists the same way as the boards, paying particular attention to the tops where water collects and anywhere timber touches the ground. Posts set straight into soil often rot at ground level, just as fence posts do.
If several joists are soft, or the deck moves as a whole, the frame is failing. Repairs to the surface will only hide that for a short time.
Decking
- Timber and composite choices
- Strong subframe construction
- Steps and edges finished neatly
Loose or popped screws
Timber swells when wet and shrinks when dry, and over many seasons that movement works screws loose. A raised screw head catches bare feet and lets water into the hole. Where the timber around it is still sound, the screw can be replaced with a slightly longer one or set in a fresh position. If screws keep lifting in the same area, the joist beneath may be too soft to hold them.
Slippery decking
A slippery deck is usually a dirty one. Algae and moss grow on timber that stays damp, especially under trees or on a north facing side of the house. A thorough clean removes the film, and keeping the gaps between boards clear lets water drain through rather than sitting on top. Grooved or textured boards give more grip, and making sure the deck sheds water properly does more than any coating.
Replacing boards on a sound frame
Where the frame is solid but the boards are tired across the whole deck, the boards alone can be replaced. This is a good opportunity to change material: composite boards can go onto a timber frame in good condition, provided the joist spacing suits the board, which our comparison guide explains. New boards will look different from weathered old ones, so replacing a whole run or area usually looks better than patching single boards.
When a full rebuild makes sense
A rebuild is the better answer when the frame has rotted, when the deck was built too close to the ground with no airflow, or when repairs are being made in a different place every year. It is also the moment to rethink: a rebuilt deck can change shape, height or material, and some households decide a patio would suit the space better. Our guide comparing patios and decking covers that choice, and the timescales guide explains how long a new deck takes.
Making a repaired deck last
Keep the gaps between boards clear of leaves and debris so water can drain. Sweep and wash the surface each spring. Timber boards need oiling or staining from time to time. Make sure nothing, such as soil, planters or a raised bed, is piled against the frame, because that keeps the timber wet. If you are unsure whether your deck is worth repairing, Ashley can look at the frame on a visit and write up what it needs.
A repair plan for timber or composite
Garden decking repair separates damaged boards from failing supports. For repairs near you, describe the material and movement.
Composite decking repairs require compatible profiles and accessible fixings. Check these before choosing individual replacements; widespread frame decay may mean decking replacement instead.
Need it sorted? Book decking
Arrange an assessment before ordering boards.