Why Cedar Handles British Weather Better Than Most — But Still Needs a Hand

Cedar has earned its reputation the hard way, one wet winter at a time. Western red cedar and its close relations carry natural oils and resins in the heartwood that make them genuinely resistant to rot and insect attack, which is why a well-built cedar fence will comfortably outlast a softwood panel several times over. But "resistant" is not "immune". A British winter, with its driving rain, horizontal gales and weeks of grey drizzle, gives timber a proper examination. The parts that fail first are almost always the same four: end grain, cut edges, metal fixings and anything sitting in damp soil. Get those right and your fence will shrug off most of what the Atlantic throws at it.

Inspect After Every Big Blow

Make a habit of walking the full length of your fence once the wind has dropped. Storms rarely cause dramatic damage to a sound cedar fence, but they do work fixings loose, shift posts in saturated ground and drop debris exactly where you don't want it. Watch for:

• Posts that have started to lean, twist or lift out of their footings
• Boards that rattle, bow or have popped away from the rails
• Rails that have dropped, split or pulled away from the post
• Rust streaks running down the timber from nails or screws
• Any section that feels noticeably springy when you press against it

For each post, use two simple tests. First, probe the base with a screwdriver about 50–100mm above ground level. If it sinks in easily and comes out with soft, dark fibres attached, rot has taken hold. Second, tap the post with the handle of the screwdriver. A crisp knock means sound timber; a dull thud usually means the centre has gone hollow. Catching this in autumn is far cheaper than replacing a whole run in spring.

Clear Debris and Keep the Base Open

Rot begins at ground level because that is where water lingers. Fallen leaves, grass clippings, moss, soil splash and wind-blown compost all pile up against the bottom of the fence and act like a damp sponge pressed permanently to the timber. A few minutes with a rake and a stiff brush after a storm is one of the highest-value jobs you can do.

• Sweep leaves and debris away from the base along the whole run, both sides if you can reach
• Trim grass short and never let soil mound up against the boards
• Pull wheelie bins, log stores, planters and compost heaps at least 100mm clear of the fence
• Check that gutters, water butts and shed roofs are not discharging straight onto the fence line
• Inspect the gravel board, if you have one — it is sacrificial, so let it do its job rather than the boards above it

Aim for a visible gap of air beneath the lowest board, ideally 25–50mm, or a solid gravel board sitting clear of the soil. If the bottom board is already touching earth, lift the ground away from it or accept that it will need replacing first.

Air Circulation Is Your Best Preservative

Timber dries fastest when it can breathe, and moving air does more for fence longevity than any tin of product. Dense planting, creeping ivy and cladding all trap moisture against the wood and keep it damp long after the rain has stopped.

• Keep at least 300mm between the fence and any shrub, hedge or vigorous climber, and more for fast growers such as laurel or cotoneaster
• Trim back ivy, wisteria and jasmine so they never bridge across the boards or sit tight against the rails
• Avoid nailing trellis or extra panels flush over the surface — leave a small gap so air can pass behind
• Keep the vertical gaps between boards clean of moss and cobwebs so the fence can ventilate naturally

Treat It — But Only When It Has Properly Dried Out

Cedar does not need annual treatment, and slapping product onto wet timber is worse than doing nothing, because you seal the moisture in. If you want to deepen the colour or add extra protection, wait for a settled dry spell of two or three days, then apply a water-repellent oil or a breathable stain. Pay particular attention to cut ends, end grain and the top edges of boards, since these soak up water fastest. Avoid varnish, polyurethane and any thick film-forming finish — they trap damp, crack and peel, and create pockets where rot quietly begins. When cleaning off green algae or moss, use a soft brush with diluted oxygen-based cleaner and rinse well. Never use a pressure washer on full blast, as it opens the grain and drives water deep into the wood.

Small Repairs Worth Doing Before Winter Returns

Fix the small things now and you will not be rebuilding in February. Replace any mild-steel nails or screws with stainless steel or hot-dip galvanised fixings, which will not rust or stain the cedar. Where a post base has rotted but the post above is sound, a concrete repair spur or metal post spike will save the whole run. Re-fix rattling boards with new stainless screws rather than hammering old nails back in. Finally, brush heavy snow off the top of the fence during cold snaps and clear it from the base, so meltwater drains away instead of soaking into the end grain you worked so hard to protect.