A log cabin roof takes a beating in a British winter. Driving rain, sleet, and freeze-thaw cycles work away at every joint and fixing. The good news is that most leaks announce themselves early — if you know where to look. A few hours spent checking and clearing after heavy rain will save you a fortune in timber repairs.

Inspect after every major storm

Wait for the rain to stop, then give the roof a proper look. From the ground, use binoculars to scan for obvious damage: slipped tiles, lifted felt, or debris sitting in valleys. Then go inside. Damp patches on the ceiling or walls are the first sign of a problem. Use a torch to check corners, around the chimney, and under any roof windows. Look for dark rings, soft plaster, or a musty smell. If you find nothing obvious, wait for the next downpour and check again — some leaks only show up in wind-driven rain.

Clear leaves, moss and debris from valleys and gutters

Wet winters mean blocked gutters and valley trays. When leaves and moss build up, water backs up under the roofing felt or shingles and finds its way inside. Clear debris after every storm, and at least once a month from October to March. Use a soft brush or a leaf blower on a dry day. Never use a pressure washer on a felt or shingle roof — it strips the protective granules and forces water into the overlaps. Check these spots every time:

• Gutters and downpipes, especially where trees overhang.
• Valley trays where two roof slopes meet.
• Behind dormers, chimneys and roof vents.
• Any flat or low-pitch section where water pools.

If you have trees nearby, consider fitting a mesh guard to downpipes. Clear behind dormers and around any roof vents, where debris collects most.

Felt roofs: watch for ripples, blisters and nail fatigue

Mineral felt is common on log cabins and garden rooms, and it copes well with rain when it is in good condition. After heavy rain, look for ripples or blisters. These happen when water gets under the felt and freezes, or when trapped moisture expands in the sun. Small blisters can be repaired with a patch of self-adhesive flashing tape, but only if the area is completely dry. Check every nail head. If nails have started to pop, the felt is lifting and water will get in. Tap them back down and cover with a dab of roofing mastic. If the felt is brittle, cracked, or more than ten years old, plan to replace it rather than patch it indefinitely.

Shingles: lifted tabs, missing granules and cracked sealant

Bitumen shingles and cedar shingles both need attention after a wet, windy spell. Walk the perimeter and look up. Lifted or missing tabs are obvious entry points for water. On bitumen shingles, check that the self-adhesive strips are still sealed. If a tab has lifted, warm it gently with a hot air gun (on a dry day) and press it down, or use a spot of roofing mastic. Missing granules mean the shingle is reaching the end of its life — replace any that are bald or cracked. Cedar shingles can split; replace split ones and check that the fixings are not corroded. Never walk on a wet shingle roof — you will damage it and risk a fall.

Metal roofs: fixings, seams and condensation

Corrugated metal and standing seam roofs are popular for their durability, but they are not maintenance-free. After heavy rain, check every fixing. Neoprene washers perish over time — a two-minute check can prevent a drip that rusts your cabin's timber frame. Replace any washer that looks cracked or compressed. Tighten screws that have worked loose, but do not over-tighten or you will crush the washer. Look for scratches or scuffs where the coating has worn away; touch up with a metal paint to stop rust. On the inside, check for condensation. If the underside of the metal is dripping, you need better ventilation — add soffit vents or a breathable membrane. Standing seam roofs rarely leak at the seams, but check the crimped edges for any gaps after a storm.

Seals, flashings and the details that cause most leaks

Most leaks start at the details, not the middle of the roof. Check the flashing around chimneys, vent pipes, and where the roof meets a wall. Old mastic cracks and shrinks — if it is hard or peeling, replace it. Use a butyl or silicone sealant suitable for exterior use. For a more permanent repair, use self-adhesive flashing tape over clean, dry surfaces. Check roof windows and skylights: the seals around the frame can fail, and the hinges may need adjusting. Look inside for daylight around any penetration — that is a leak waiting to happen. Finally, check the eaves and the fascia boards. Water running behind a blocked gutter can rot the timber before you notice it inside. A methodical check after each winter storm takes an hour, but it keeps your cabin dry, warm, and ready for the next downpour.