Ice Dams: Causes, Prevention, and Solutions for Damaging Roof Ice Buildup

Ice damming—when snow melts on a warm area of roof and flows down until refreezing on a colder area—can ruin roofing, sheathing, and non-weather-resistant materials below. Keep this from happening to your home with this guide to preventing and eliminating ice dams.

Development of Ice Dam
Fig. 1: The Birth of an ice dam. 
Ice buildup along the edges of a roof is more often caused by air leaking from the house than by inadequate insulation levels.
Map of recommended insulation levels
Fig. 2: Recommended insulation levels for houses, by region.

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