Spring terrace maintenance: what to check before summer
The Abimeister team · Updated · 5 min read
Winter is hard on a terrace. Snow sits on the boards for months, meltwater gets into every joint, and frost works at anything that was already loose. Once the snow is gone and the boards have had a few dry days, it is worth going over the whole terrace before you put the garden furniture back out. This guide covers what to look for, how to deal with mould and algae left by the damp, and when re-oiling actually makes sense rather than being a job done too early into wet timber.
Why spring is the right time to look the terrace over
A terrace goes through the harshest part of its year between November and April: standing water, freeze-thaw cycles, and weeks under snow that keep the wood damp long after the air temperature has risen. Any weakness in the fixings or the boards tends to show up right after the thaw, before the sun and wind have dried everything out again.
Checking in spring means you catch problems while they are still small and while the terrace is not yet in daily use for sitting, barbecuing, or children playing. A loose board found in April is a five-minute fix. The same board ignored until August, with weight going over it all summer, can split or pull its screws out completely.
Checking for loose boards and fixings
Walk the whole terrace slowly, in socks if you can, and feel for any board that gives slightly underfoot or rocks when you press one end. Pay particular attention to the edges and the area around steps, where water pools longest and fixings take the most strain.
For a screwed deck, a loose board is usually just a screw that has worked its way up or a housing that has swollen and shrunk enough to loosen its grip. For hidden-clip composite systems, check that no clip has snapped or slid out of its groove. Also look at the substructure joists where you can reach them — any joist that feels soft or spongy under a screwdriver point has taken in water and needs attention before it takes weight again.
- Press each board near its edges and at both ends, listening and feeling for movement
- Re-drive or replace any screw that spins freely instead of biting
- Check joists for softness, especially near the house wall and at ground contact points
- Look at handrail posts and step stringers, which take the most repeated stress
- Note any board that has cupped or twisted more than a few millimetres for later replacement
Removing mould and algae from the surface
A greenish or grey-black film on the shaded side of a terrace, or in the gaps between boards, is almost always algae or mould that has grown through the damp winter months. It looks worse than it usually is, but left alone it makes the surface slippery and holds moisture against the wood.
Scrub the affected boards with a stiff broom or deck brush and a wood-safe cleaner meant for terraces — most garden centres in Estonia carry one. Avoid a pressure washer on close range, since it can gouge softwood and force water under composite boards; if you use one, keep the nozzle moving and at a distance. Rinse well and let the terrace dry fully, which in Harju county spring weather usually takes two or three dry days.
Only once the surface is completely dry and free of green film should you move on to any oiling or sealing, since oil applied over mould just traps it under a fresh coating.
When and how to re-oil the terrace
Softwood decking (pine, spruce, thermowood) generally needs re-oiling every one to two years, depending on sun exposure and how much the surface has greyed. Composite decking does not need oil at all — if yours is composite, this step can be skipped entirely and the cleaning above is normally the full spring job.
The right moment is after the wood has fully dried out from winter and spring rain, and before the first stretch of hot, dry summer days when oil dries too fast to soak in evenly. In practice, this is often a calm week in May with no rain forecast for at least two days afterwards. Apply with a brush or roller along the grain, wipe off any excess after fifteen to twenty minutes so it does not sit tacky on the surface, and keep foot traffic off until the following day.
When it is worth calling in a skilled tradesperson
Cleaning and re-oiling are jobs most house owners can do themselves over a weekend. Structural issues are a different matter: joists that have rotted at the point where they meet a concrete footing, a terrace that has started to pull away from the house wall, or boards that have warped badly enough to trap water are worth having looked at properly rather than patched over.
If more than a handful of boards need replacing, or the substructure needs checking and partly rebuilding, our decking and terrace work starts from 90 € per job, quoted after we see photos or visit. For smaller jobs — refitting a few boards, re-tightening a handrail, a proper deck clean before you tackle the oiling yourself — our odd-job rate from 39 € per hour, minimum one hour, usually covers it. We work across Tallinn and Harju county and can generally come out within a few days in the spring season.
Check every board and fixing while the terrace is still damp from winter, clean off any mould before it dries in, and only oil softwood once the boards are fully dry and the hot weeks have not yet started.