An ice dam is a ridge of ice that forms on the roof’s edge. It protects melting snow or water from draining off the roof. It usually formed when the bottom layer of the snow on the roof is melted by the warmth of your home interior. When exposed to frigid air, the water that backs up behind the dam can leak into a home below causing damage to ceilings, walls, insulations and other areas of your home.
You should consult your roofing expert about insulating the attic of your home if you need more protecting against ice damaging in your home.