Prevent Ice Dams

We have all seen ice dams - a ridge of ice that forms at the bottom edge of a sloped roof. This occurs when the temperature of the attic or part of the roof deck rises above freezing. The snow melts and water flows down to the cool eave, re-freezing and building a ridge of ice. Believe it or not, ice dams can cause permanent damage to your home. Some damage occurs to your shingles due to the freeze and thaw of the ice and in some cases shingles are damaged by homeowners using sharp tools trying to chip and smash the ice. The most significant damage is from water getting into the attic and exterior walls. This happens when water from melting snow pools above the dam and flows back under the shingles into your attic space, ceilings and walls below. Once this happens you must open up the wet areas, remove the insulation, treat for any mold that may have grown and rebuild the damaged area.

There is no way to completely prevent ice dams but things can be done to eliminate the causes to reduce their occurrence. The key is proper ventilation and insulation to keep the attic and roof deck as cool as possible to reduce the snow melt. Most homes can have additional insulation and attic ventilation installed - reducing ice dams with a bonus of improved energy efficiency. Homes with partially finished attic space present the greatest challenge in reduction of ice dams because the finished space warms the roof deck directly causing uncontrollable snow melt. In some cases there is no choice but to rake the snow from your roof after each major snowfall or install permanent heating elements to melt the dams. Whatever your situation is, IHP can help you find and implement the right solution.