Is My Skylight Leaking Because of the Ice Dam?
Last updated October 25, 2026
The short answer
How Ice Dams Form
Ice dams happen when heat from your attic melts snow on the upper roof. The water runs down and refreezes at the colder eaves, creating a ridge of ice. As more snow melts, water pools behind that ridge and can push up under the roofing material.
If your skylight sits below that pooled water, the water can find gaps in the flashing or seals. The leak may show up as a drip near the skylight or a wet spot on the ceiling below. Ice dams often cause leaks that appear hours after the melting starts.
Other Causes of Skylight Leaks
Not every skylight leak comes from an ice dam. Worn or cracked flashing, broken seals, or a damaged skylight dome can let water in during heavy rain. Condensation from poor ventilation can also look like a leak, with water droplets forming on the glass or frame.
If you see water stains only during cold weather, an ice dam is likely. If the leak happens during any rain, the problem is probably the skylight itself. A water damage inspection can help you tell the difference without guessing.
- Check the skylight flashing for gaps or cracks
- Look for a cracked or broken skylight dome
- Inspect the seals around the frame
- See if the leak only happens with snow or ice
- Feel for cold drafts that suggest poor sealing
What to Do Right Away
Act quickly to limit damage. Move furniture away from the leak and place a bucket or towel under the drip.
Remove snow from the roof if you can do so safely from the ground with a roof rake. Do not climb onto a snowy roof. For ice dams, melting a channel through the ice with a calcium chloride product can help, but follow the product instructions carefully.
When to Call the Pros
If you cannot find the source or the leak continues, local water damage pros can help. They can inspect the skylight and the surrounding roof area to identify where water is entering. They also have the tools to dry out wet insulation and drywall before mold sets in.
The cost to fix a skylight leak depends on the cause, the extent of damage, and the type of skylight. A simple reseal might be a minor repair, while replacing flashing or the skylight unit is more involved. You might also need a roofer for flashing work and a water damage pro for drying.
Preventing Future Leaks
Keep your attic well insulated and ventilated to reduce the heat that melts snow unevenly. This helps prevent ice dams from forming in the first place. Also, inspect your skylight seals and flashing each fall before snow season.
If you live in Layton, keep your roof clear of heavy snow when it is safe to do so. Regular maintenance can catch small issues before they become leaks. If you notice any cracked seals or loose flashing, address them early.
Water damage does not wait
Phones are answered 24/7 for Layton and nearby communities.
Call Now (801) 383-0232Frequently asked questions
How can I tell if the leak is from an ice dam or a bad seal?
If the leak only appears during or after heavy snow and ice, an ice dam is likely. If it leaks during rain or any time, the skylight flashing or seal is probably the problem. A water damage inspection can confirm the source.
Will an ice dam always cause a skylight leak?
No. An ice dam only leaks if water backs up high enough to reach the skylight and find a gap. Some skylights are installed with proper flashing that resists water, so they may not leak even with an ice dam.
Can I fix a skylight leak myself?
You can reseal minor gaps with caulk or replace a cracked dome if you are comfortable working on a roof. But if the leak is from an ice dam, you need to address the ice and the roof edge. For extensive water damage, the pros can help.