A Seasonal Checklist for Preparing Your UK Roof for Winter

Roofs rarely give way in calm weather. They give way on a wet Tuesday in November, when a gale is pushing rain sideways and something metallic is rattling somewhere above the bedroom. Almost everything that fails in a storm was visible weeks earlier — from the garden, from the pavement, or with a torch in the loft after a heavy shower.

What follows is a working checklist. It starts in late summer, while roofers still answer the phone, and runs through to the new year, with the jobs worth doing at each stage.

September: Get Eyes on the Roof While the Weather Holds

Late summer into early autumn is the best window of the year for looking at a roof. The light is good, the evenings are still usable, and any roofer you ring is far more likely to fit you in than they will be once the storms begin. Start at ground level: stand at the bottom of the garden with binoculars and work slowly along the roofline.

• Ridge tiles sitting level and pointed, with no cracks or obvious shifts
• Slates and tiles in neat courses, with no gaps where one has slipped
• Chimney stack straight, pots and cowls intact
• Valley gutters clear of leaves and growing moss
• Flashings — the lead or mortar where the roof meets a wall or chimney — still dressed tight against the brickwork
• Aerials and satellite dishes fixed firmly, not hanging off a bracket

Then go inside. Pick a day after heavy rain, take a torch into the loft, and look along the underside of the roof covering, the ridge line and the chimney breast. Damp patches, dark stains and beads of water are early warnings. Daylight where daylight shouldn't be is a job for a roofer, not a roll of tape.

October: Flashings, Chimneys and the Joints That Leak

Most leaks are not the fault of the slates. They begin at the joints — where the roof meets a chimney, a dormer, a parapet wall or another slope. Water is patient; it will find a hairline gap in mortar or a lifted edge of lead and work its way in over months.

The chimney deserves a proper look

• Flaunching: the mortar sloping away from the pots should be sound, not crumbling or cracked
• Lead flashing: chased into the brickwork and dressed over the tiles, not flapping, split or sealed with mastic
• Pots and cowls: unbroken, and capped where birds can get in
• Pointing: raked out and repointed before frost gets a grip on it

Cracked mortar and lifted lead are not DIY jobs for most people. Dressing lead properly takes skill, and a poor repair can trap water and start rot in the timbers below. If the flashing is past its best, have it replaced in new lead rather than patched with sealant, which rarely survives a winter.

Late October into November: Gutters, Downpipes and Drainage

Blocked gutters do more damage than most people realise. Water backs up, sits against the fascia, and eventually finds its way into the wall or the loft. Clear them once in mid-autumn, then again after the last leaves have fallen — for much of the UK, that means late November.

Work along each run and check:

• Brackets firm, so the gutter doesn't sag and hold standing water
• Joints and stop ends sealed, with no staining running down the fascia
• Hoppers clear where a downpipe meets the gutter
• Downpipes free-running — pour a bucket of water into the top and watch it appear at the bottom
• Gullies and drains at ground level free of leaves, so water has somewhere to go

Never lean a ladder against an unsupported length of plastic gutter; use a stand-off or rest it on the wall instead. If you're up there with a scoop or a hose, keep one hand on the ladder and your weight centred.

November: Moss, Algae and the Damp They Hold

Moss looks harmless. It isn't. It holds water against the roof covering, and when that water freezes it expands, prising up the edges of tiles and softening mortar. When the moss finally lets go, it lands in the gutter, blocks the outlet, and the whole cycle starts again.

Deal with it in dry weather, before the first hard frost.

• Scrape moss off gently with a plastic scraper or stiff brush from a ladder or scaffold
• Skip the pressure washer: it drives water under the covering and strips the surface from tiles
• Apply a suitable moss treatment afterwards, following the label, and keep it away from plants and ponds below
• Sweep up what falls and clear it out of the gutters while you're there
• If the roof is steep, high, or covered in fragile sheets, leave it to a roofing firm — it's usually a quick, modest job for them

Late November and December: Loose Slates, Ridge Tiles and Storm Fixings

This is the last chance to tighten things before the worst of the weather. Walk the perimeter again and note anything that has moved since September: slipped or cracked slates, particularly on the windward side of the house; ridge and hip tiles that have lost their mortar or sit proud; and verges and edges where wind can get underneath and lift.

On exposed roofs, tile clips, storm straps and a properly bedded or mechanically fixed ridge make a genuine difference. Satellite dishes, aerials and chimney cowls should be checked too — a loose dish in a gale is a hole in your roof waiting to happen.

When to Put the Ladder Away

Working at height is the serious part of all of this. Ladders, steep pitches, wet or frosty surfaces and ageing roof coverings are a bad combination, and falls from height remain one of the most common causes of serious injury. A roof is a long way down. If you're not confident, or if the covering might be fragile concrete sheet or asbestos cement, stop and call someone in.

Ask any roofer for proof of insurance and a couple of recent local jobs before booking. A short paid inspection in October costs far less than emergency work in January, and it's much easier to schedule. For anything structural or anything involving the chimney itself, a qualified roofer or builder is the right call.

After the Storm: A Ten-Minute Check

Once the wind has dropped, do a slow lap of the house from ground level. Look for slates in the garden, fresh gaps in the roofline, gutters pulled off their brackets and new stains on ceilings indoors. If anything has changed, get it looked at before the next front arrives — a slipped slate is easy to deal with in calm weather and a leak by the following week.

Keeping a few dated photos of the roof each autumn is quietly useful, too. It gives you a clear before-and-after when something shifts, and it saves a lot of guessing.

The aim isn't to become a roofer. It's to know your roof well enough to notice change, and to deal with the small jobs in September so that December is just weather.

Photo: rmsep4 / Pixabay