A damp patch around a roof window is worrying, but a leak is not always the window itself. Several different problems can look similar, so finding the cause is the first step.
Flashing
The flashing kit that surrounds the window seals it to the roof covering. If it was fitted badly, or has been damaged by wind or by old age, water can get past. A flashing that does not sit correctly with the tiles or slates around it is a common cause. A repair may involve lifting the surrounding tiles and re-fitting or replacing the flashing.
Seals and glazing
Over time, the seals around the glazing can perish. Cracked glass or a damaged frame can also let water in. Some windows can have parts replaced, while others need to be renewed.
The roof around it
Slipped tiles above the window, a blocked valley nearby or debris collecting above the frame can send water towards it. Sometimes the leak enters elsewhere and only shows up at the window.
Condensation
Drips on or around a roof window may be condensation, not a leak. Warm, moist air in a room condenses on a cold surface, especially in bathrooms, kitchens and bedrooms. Better ventilation, such as opening the window, usually helps. Condensation tends to be worst on cold mornings and clears as the day warms.
Finding the cause
A roofer will look at the window from outside and inside, check the flashing and surrounding tiles, and decide whether the problem is a leak or condensation. We would rather diagnose it properly than guess.
See our VELUX Window Installers section or call 07766 547309.
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