The short answer
Common Causes
The most frequent culprit is failed flashing, the metal or rubber pieces that bridge the skylight to your roof. Over time, flashing can pull away or crack, letting rainwater slip underneath. Sealant around the glass can also shrink or split, creating a direct path for water.
Another cause is a damaged skylight curb, the raised frame that sits on the roof. If the curb is rotted or poorly installed, water can pool and seep through. Condensation is also possible, especially in humid weather, when warm indoor air meets cold glass and drips down.
Inspect the Flashing and Seals
Start by looking at the flashing from the outside, if you can safely do so. Check for gaps, rust, or lifted edges. Also examine the sealant around the glass and the curb. Cracks or missing chunks are red flags.
If you cannot reach the roof safely, use binoculars from the ground to spot obvious damage. Do not climb onto a wet or steep roof. For a thorough check, a local water damage pro can assess the condition and identify where water is entering.
- Look for cracked or missing sealant
- Check for lifted or rusted flashing
- Inspect the curb for rot or warping
- See if the glass is cracked or loose
- Look for clogged weep holes or drainage channels
What to Do Right Now
If water is actively dripping, place a bucket underneath and clear the area of furniture or valuables. You can also use a towel to soak up moisture. This limits damage to your flooring and belongings.
After the rain stops, dry the area as much as possible. Use fans or a dehumidifier to reduce moisture, which can lead to mold. If the leak is severe, consider contacting a water damage pro to help with extraction and drying.
When to Call a Pro
You can handle minor sealant touch-ups yourself if you are comfortable on a ladder. But if the leak persists or you see signs of structural damage, such as sagging drywall or stained wood, professional help is wise. A water damage pro can also check for hidden moisture in your ceiling.
The pros can perform a water damage inspection to trace the leak's source and recommend repairs. They can also dry out the affected area to prevent mold. If the leak has caused drywall damage, you may need drywall repair after the roof issue is fixed.
Preventing Future Leaks
Regular maintenance can catch small problems before they become big leaks. After heavy storms, inspect the skylight from inside and outside for any new cracks or gaps. Keep the roof around the skylight clear of debris, which can hold moisture.
If your skylight is old, consider having it inspected annually. Freeze-thaw cycles can stress flashing and seals, especially in cold climates. After winter thaws, check the skylight for any new gaps or cracks.
Talk to someone now
Call (313) 766-2970 any time, day or night, and describe what happened.
Call Now (313) 766-2970Frequently asked questions
Can I fix a skylight leak myself?
Yes, for minor sealant cracks or small gaps, you can apply a high-quality exterior sealant. However, if the leak involves structural issues or you are unsure, leave it to a pro to avoid further damage.
Why does my skylight leak only during heavy rain?
Heavy rain can overwhelm small gaps or clogged drainage paths. Rain driven by wind can also force water into places that light rain does not reach. The leak may be a slow drip that only becomes noticeable during intense storms.
What if the leak is from condensation?
Condensation looks like water droplets on the glass and can drip down. Improve ventilation in the room and use a dehumidifier. If the skylight is old, replacing it with a double-pane unit can reduce condensation.
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