VELUX Window Installers › Barry › Guide
A damp patch or drip beside a roof window sends most people straight to blame the window. In practice the glass is rarely the culprit. On Barry homes, where wind-driven rain comes in off the Bristol Channel, the trouble is usually in how the window was flashed, sealed or insulated, or in the roof covering around it. Finding which is the whole job.
Flashing that has failed or does not match
A roof window sits in a flashing kit that must match the roof covering, whether slate or a particular tile profile. If the wrong kit was used, or it has been disturbed by later roof repairs, water can find a way beneath it. Flashing also lifts or corrodes with age and salt-laden air, which Barry's coastal position makes more likely. Terraced lofts in Barry often have windows added decades apart, so no two are quite alike.
Sealing and fixings at the frame
Seals at the sides and head of the window can dry, crack or shift. Fixings may have loosened if the frame was not firmly secured to the rafters. In strong gusts, rain is driven sideways into small gaps that would stay dry in calm weather, so a leak may only show up in certain winds. A drip that appears only after a storm usually points to the edges, not the glass.
Condensation that looks like a leak
Water running down the glass or frame inside is often condensation, not rain. It happens when warm, damp air meets a cold surface, and poor insulation or missing vapour control around the opening makes it worse. Bedrooms and bathrooms in loft rooms are the usual places. The fix is around the lining, not the flashing. Wiping it away is fine, but if it keeps returning, the room needs better ventilation or lining work.
The roof covering around the window
Sometimes the window is fine and the roof around it is not. Slipped slates, cracked tiles or blocked valley gutters above the window send water towards it. Moss building up on the slope beside a window can also hold water against the flashing. Blocked gutters above or beside the window can add to the problem.
What we check from inside and out
We start from the room and loft, looking for stains, damp timber and wet insulation, then look at the covering from the ground. Please do not go onto the roof to hunt for the cause. From what we find, we explain whether it needs re-flashing, resealing, lining work or tile repairs. We then explain the likely cause in plain terms before suggesting any repair.
- Stains and damp on rafters and lining
- Wet or compressed insulation near the frame
- Flashing sitting proud, lifted or corroded
- Slipped, cracked or mossy covering above
- Condensation marks on the glass and frame
Need velux window installers in Barry? See our velux window installers in Barry page, or call 07766 547309.
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Common Questions
Is the glass the usual cause of a leaking roof window?
Rarely. Most leaks come from the flashing, the sealing, condensation or the roof covering around the window. The glass unit itself only causes trouble if its seal has failed, which shows up as misting between the panes.
Why does my roof window only leak in some weather?
Wind-driven rain pushes water sideways into small gaps that stay dry in calm conditions. In Barry, strong south-westerlies off the Channel can reveal a flashing or seal weakness that otherwise stays hidden for weeks.
Can a leaking roof window be repaired without replacing it?
Often yes. If the window is sound, re-flashing or resealing may fix it. If the window is old, damaged or fitted with the wrong kit, replacement can be the better course. We look first and tell you honestly.
Get a Quote in Barry
Tell us what the roof is doing in Barry and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.