How to Fix a Leaking Skylight
Quick Answer
From the roof, apply a roofing sealant around the flashing and the glass edges; from inside, check for condensation.
How to troubleshoot a Leaking Skylight
A leaking skylight can damage ceilings and walls. This guide covers sealing the flashing and applying a clear sealant to the glass.
Step-by-Step Fix
- Place a bucket under the leak inside to catch any dripping water.
- From the roof, locate the skylight and check the flashing for gaps or rust.
- Apply a generous bead of roofing sealant around the flashing and the glass edges.
- Check the skylight dome or glass for cracks; if found, replace the glass panel.
- From inside, check for condensation that may be mistaken for a leak.
- Ensure the skylight curb is properly sealed to the roof membrane.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| Leak returns after sealing | Water tracking or flashing issue | Check the roof slope and install a diverter to redirect water. |
| Condensation inside | Poor ventilation | Install a moisture-absorbing device or improve attic ventilation. |
Frequently Asked Questions
Can I fix a skylight leak from inside?
Temporary fixes can be done inside, but permanent repair requires roof access.
How often should skylight seals be replaced?
Every 5-10 years, depending on exposure and weather conditions.