How ice dams form
Heat from the house warms the roof deck and melts snow. Water runs down to the eaves, which are colder because they're past the heated walls. There it freezes into a ridge of ice. More meltwater pools behind the ice and backs up under shingles or into seams.
Signs
- Icicles hanging from gutters and eaves
- Thick ice along the roof edge
- Stains on ceilings near exterior walls
- Water marks inside the attic near eaves
What we fix
- Repair damaged shingles, underlayment and flashing
- Install ice and water shield at eaves when reroofing
- Seal low-slope eave edges with reinforced coating
- Check attic ventilation and insulation and recommend improvements
Flat roofs and snow
Flat roofs see a different problem: snow drifts melt slowly behind parapets and drains freeze. See snow on flat roofs.
Don't chip the ice
Chopping at ice dams damages roofing. If water is coming in, catch it, photograph it and call.
Winter leak? Call (505) 257-2289.
Common questions
Will heat cables stop ice dams?
They can help in problem spots, but insulation and ventilation address the cause.
Can you repair during snow season?
Temporary repairs often can be done. Permanent repairs may need dry weather.