Root causes of leaks
Leaking skylights are usually caused by flashing problems rather than the skylight unit itself. Poorly installed flashing allows water to penetrate around the frame, leading to damp stains and mould. Other causes include roof movement, improper slope or pitch and sealant failure. Condensation can also mimic a leak when warm indoor air meets cold glazing.
Professional leak diagnosis
A specialist begins with a visual inspection, checking the roof covering, flashing and skylight structure. We test for water ingress and examine the skylight shaft for signs of condensation. In many cases, replacing or resealing the flashing solves the problem without replacing the skylight. Where glazing has cracked or seals have perished, a replacement may be recommended.
Preventive maintenance tips
Regularly clear leaves and debris to keep channels free and gutters flowing. Check caulking and seals annually. Ensure the interior shaft is insulated and air‑sealed to prevent condensation. Hiring a certified installer to check flashing and repair minor issues can prevent expensive damage later.
FAQs
Q: How can I tell if my skylight is leaking? .
A: Look for water stains, bubbling paint or damp patches around the skylight. Condensation on the glass, especially in winter, is normal but should dissipate quickly.
Q: Can I reseal the skylight myself?
A: Minor caulking can be done DIY, but working at height is risky. Professional repairs ensure safety and long‑term results.
Q: How often should skylights be inspected?
A: A yearly inspection by a specialist is recommended, particularly before winter rains.
