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.
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.
PHOTO: TAURUS PHOTOS/CLIFF FAIRFIELD
Fig. 2: Recommended insulation levels for houses, by region.