WHAT IS ICE DAMMING?

Ice damming occurs when snow on the roof melts from the heat in the house and then freezes over unheated areas, such as the bottom edge of the roof at eaves, attached porches, and garages.

Water leakage occurs when the snow above the ice dam melts or it rains, but the ice below prevents proper drainage creating a backup of water. If enough water collects it will back up under the shingles and leak into the eaves or the house.