Golem Roofing completed a skylight reinstallation during roof replacement project in Los Angeles, CA. Skylight leaks account for a significant portion of all roof leak calls. The problem is almost never the skylight itself — it's the flashing and sealant around the skylight curb. UV exposure, thermal cycling, and age cause these materials to crack and separate over time. Proper repair involves removing the old sealant, installing new step flashing on all four sides, and applying commercial-grade sealant around the entire perimeter.
Skylight Leaks — Causes and Solutions
Skylight Leaks — Causes and Solutions
Skylight leaks account for a significant portion of all roof leak calls. The problem is almost never the skylight itself — it's the flashing and sealant around the skylight curb. UV exposure, thermal cycling, and age cause these materials to crack and separate over time. Proper repair involves removing the old sealant, installing new step flashing on all four sides, and applying commercial-grade sealant around the entire perimeter.
Skylight Maintenance and Repair
- Check Sealant Annually: Skylight sealant dries out and cracks from UV exposure. Annual inspection catches problems before they leak
- During Roof Replacement: If your skylight is more than 15 years old, consider replacing it during a roof replacement — the flashing area is already exposed
- Water Testing: To find the exact leak source, controlled water testing (spraying specific areas while monitoring from inside) is more effective than visual inspection
- Proper Flashing: Step flashing on all four sides, counter-flashing at the curb, and weep holes for drainage are essential for a lasting repair
Frequently Asked Questions
Why do skylights leak?
Skylights themselves rarely fail — the leak almost always comes from deteriorated flashing or dried-out sealant around the skylight curb. UV exposure, thermal cycling, and age cause these materials to crack and separate, allowing water to penetrate at the roof-to-skylight junction.
Should I replace my skylight during a roof replacement?
If your skylight is more than 15 years old, yes — replacing it during a roof job saves money because the flashing area is already exposed. New skylights from manufacturers like Velux or Fakro come with leak warranties that align well with your new roof warranty.
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Service Areas
Golem Roofing serves Long Beach, the South Bay, Palos Verdes, and nearby Los Angeles County communities.
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