Ice Dams in Madison: Causes, Warning Signs, and Prevention
Ice dams form when heat escapes into the attic, melts roof snow, and refreezes at the eaves. In Madison and across Wisconsin, they can lead to leaks, damaged shingles, stained ceilings, mold, and costly repairs.
How ice dams form
You need snow on the roof, heat loss from the home, and roof areas that stay below freezing. Warm upper roof sections melt snow, and the runoff freezes again near the eaves or gutters.
Warning signs
Large icicles or ridges of ice along the roof edge
Ice filling gutters or spreading onto siding
Water stains, damp insulation, or moisture in the attic
Dripping or running water during a thaw
Prevention
Seal attic air leaks around penetrations, chimneys, and fixtures
Improve attic insulation and ventilation
Keep gutters clear and remove snow safely when conditions allow
Call a roofing professional if you see signs of leaks or repeated ice buildup
The University of Minnesota Extension also emphasizes long-term control through air sealing, insulation, and proper attic ventilation, along with prompt drying and professional help if water has already entered the home.
Check out this video on ice dams
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