Icicles hanging along your gutters may remind you of the beauty of winter, but unfortunately they are trouble. This is because conditions which allow icicles to form, snow covered roofs and freezing weather lead to ice dams. Ice dams are thick ridges of solid ice that build up along your gutters. Dams can tear off eaves, gutters, loosen shingles, and cause water to back up and leak into your house. When this happens it can cause peeling paint, warped floors, stained and saggy ceilings. Not to mention wet & moldy insulation in the attic.
How Ice Dams form:
1. Heat rises and collects in the attic.
2. The heat warms the roof, except in the gutters.
3. Winter comes with snow and cold temperature, gathering on your roof.
4. The heat from your home causes the snow to melt on your warm roof and then freezes on the cold gutters.
5. Ice accumulates forming a dam (often you’ll see icicles– even the smallest icicles can mean ice dams).
6. Melted water from the warm roof backs up behind it, flows under the shingles, and into the house.