Why Roof Windows Leak—and How We Fix It

Most roof window leaks trace back to detailing around the frame: perished gaskets, a flashing kit that doesn’t match the roof covering, blocked gutters around the window, or underlay not dressed correctly into the frame. In York’s mixed weather, wind can drive rain sideways under a short upstand or past a tired seal, so the stain you see indoors may be offset from the true source.

• Flashing kits: we confirm the window model and the roof covering (tile, slate, profile) and install the correct kit with proper laps.
• Perimeter sealing: renew gaskets and weatherproofing where they’ve shrunk or hardened.
• Underlay connection: ensure the membrane turns into the frame’s drainage channels so water exits correctly.
• On-roof housekeeping: clear debris from the head flashing and side gutters to prevent overflow.

For a general primer on roof maintenance and why correct detailing matters, see this external resource from Neal Roofing. We’ll apply the same best-practice mindset to your roof window repair.

Upgrades: Better Light, Less Heat Loss

If your window is sound but dated, upgrading glazing can improve comfort and reduce drafts. Modern units offer better thermal performance and clearer sightlines. On older installations we often combine a new flashing kit with the upgrade so water handling is modernised at the same time. We’ll also check internal trims, vapour barriers and the plasterboard reveal to avoid cold bridges.

When Replacement Makes Sense

• Severely corroded frames or obsolete parts that are no longer economical to repair
• Persistent leaks from multiple failure points (frame + flashing + underlay)
• Desire for bigger daylight area or opening options (top-hung vs. centre-pivot)
• Home upgrades such as loft conversions where size/position changes are planned

We’ll advise on sizes, opening types and finishes that suit your roof pitch and covering. If carpentry alterations are required, we’ll explain the method and ensure structural integrity and weathering are maintained throughout.

Condensation vs. Leaks (Know the Difference)

Water on or around a roof window isn’t always a leak. Condensation forms when warm, moist indoor air meets a cold surface. Bathrooms, kitchens and unvented lofts are common hotspots. Signs include misting between panes (failed sealed unit) or water droplets on the internal frame after showers.

• Improve ventilation: trickle vents, extractor fans and controlled window opening
• Check insulation and vapour barriers around the window’s reveal
• Upgrade to better-performing glazing to reduce cold surfaces

During your survey, we’ll separate condensation issues from true leaks so the remedy is targeted and cost-effective.

Serving York & Surrounding Areas

We cover York and nearby villages including Acomb, Bishopthorpe, Haxby, Huntington and Poppleton. Access is planned sensibly—safe ladders or a small tower for most homes, and short-duration scaffold where necessary. You’ll receive a clear, written quotation before any work begins, with photos on request for your records or insurer.

Velux & Roof Window — FAQs