Can You Replace a Roof in Winter?

What the cold does to the work

Tiles and slates themselves do not mind winter. The trouble is everything around them. Mortar and bedding compounds need frost-free conditions to set, and a bed that freezes before it cures will crumble, so on cold days ridge and hip work is done with dry-fix systems that rely on mechanical fixing, not wet mortar. BS 5534:2014 already expects ridge, hip and verge parts to be mechanically fixed, so this is good practice in any month.

Sealants and adhesives have a working temperature range printed on the tube. Below it they will not bond. Breather membranes and underlay become stiff and harder to lay flat in a cold snap, and a frosted roof is slippery, which is a safety question before it is a quality one. On a pitched roof, nobody should be working on a surface that is icy.

Wind, rain and the short day

The weather matters more than the temperature. A strip in a gale is dangerous for the crew, for the neighbours and for loose tiles and sheets, so work stops when the wind is high. Winter also gives fewer working hours, because the light goes early in the afternoon. A job that might take a week in June can stretch, and it is better to be told that at the quote than to find out on day four.

That is why a winter roof is stripped in sections, not all at once. A slope is opened, felted or sheeted, battened and covered over the course of a day or two, so that only a manageable area is ever exposed. If the forecast turns, the open section is covered with heavy-duty sheeting held down with battens. Our page on what happens if it rains during a roof replacement goes into the cover arrangements.

Why some people choose winter

Autumn and winter can be quieter for roofers than spring and summer, so a start date may be easier to get. Many roofs also reveal their failings in a wet winter, with a leak showing up on a ceiling, and that tends to push the decision. Waiting for spring with an active leak can cost more in ceiling and insulation damage than the job saves. Where a roof is failing, the sensible move is often to make it safe first and then pick a window.

If a roof is in reasonable order and the only question is timing, you can plan the work for a settled spell, which is a cheaper form of patience than a damaged ceiling. We tell you if a roof has years left in it. Our page on when to replace a roof helps with that judgment.

Wildlife, the loft and other winter checks

Nesting birds are not an issue in the deepest winter, but bats may be hibernating in a roof void, and they are protected. If there are signs of bats, work may need to be timed or surveyed first. The loft needs its own attention in winter: the stored boxes should be moved or covered, and insulation lifted for any rafter work should be put back dry. Condensation can also appear if a roof is stripped and re-felted while the house is heated, so loft hatches are kept shut to stop warm air rising into the open roof void.

Flat roofs are a different case. A torch-on felt or GRP roof needs dry, reasonably warm conditions to bond, and a roofer who will lay a liquid system on a frosty deck is cutting a corner. Single-ply EPDM tolerates cold better than the rest, though the adhesive still has a minimum temperature.

What to ask your roofer

Ask how the roof will be covered each night, what happens if the work stops for a week, and who decides whether a day is workable. Ask which fixing methods will replace wet mortar if it is cold. Ask for a start window, not a date, and for a plain statement that dry days come first. You can read how the job normally runs in our page on how long it takes to replace a roof.

We survey the roof for free and photograph what we find, then give you a fixed written quote. Our workmanship is guaranteed for ten years, and that promise is written down too. If winter is the wrong time for your roof, we say so. The rest of the service is described on our roof replacement page.