Skylight leaking around the edges

Symptoms

• Water dripping or staining around the skylight frame
• Condensation confused with a leak on cold mornings
• Leak appears mainly during heavy or wind-driven rain

Likely causes

• CommonDeteriorated flashing or sealant around the frameSealant and flashing age faster on skylights due to constant sun and temperature swings.
• CommonCondensation on the inside of the glass dripping downWarm moist indoor air hitting a cold skylight can mimic a leak, especially in winter.
• PossibleCracked skylight glazing or domeImpact damage or age can crack the seal between glass layers.
• PossibleClogged or damaged roof drainage around the skylight curbDebris trapped uphill of the skylight can pool water against the frame.

What to do

1. Check if the moisture happens only on cold mornings without rain, which points to condensation rather than a leak.
2. If it happens during rain, look closely at the interior trim for the exact location water is entering.
3. From outside, check for debris or leaves piled against the uphill side of the skylight curb and clear it away.
4. Inspect visible flashing and sealant around the skylight from a ladder for cracks or gaps.
5. For condensation, run a bathroom or kitchen exhaust fan more often and consider a dehumidifier to lower indoor humidity.
6. For an actual leak, reseal small visible gaps with appropriate sealant as a short-term fix.
7. Have a roofer inspect and reflash the skylight if the leak persists, since long-term fixes usually require re-flashing.

Tools and parts

• Ladder
• Flashlight
• Sealant gun

When to call a pro

Call a roofer experienced with skylight flashing if resealing doesn't fix it, or the skylight manufacturer if it's still under warranty.

Safety