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Ice Dams

ice damsIce Dams

What are Ice Dams?

Ice damming occurs on roofs when snow on your roof melts and then refreezes near your gutters, often causing damage to your shingles. Ice dams can occur on almost any residential roof in Michigan. The most common causes are inadequate insulation in the home and poor roof ventilation. Ice dams most often occur in ranch style houses or houses with low roof slopes and large overhangs. Ice dams occur when snow is present on the roof and the outside temperature is below freezing. Homes with poor insulation allow heat to escape from the living quarters into the attic. If the roof system is not properly ventilated, the heat will build up in the attic and warm the roof deck, melting the snow above. When the melted snow reaches cooler roof areas, usually the gutters or areas near the overhang (eaves) it will refreeze. This freeze-thaw process can damage shingled roofs since the ice can travel “upslope” and get underneath the shingles.

Prevention and Protection

Installing new shingles will not prevent ice dams. Prevention only occurs when the entire roofing system is addressed, including attic insulation and roof ventilation. Ideally, the temperature in the attic space should be close to the same temperature as the outside air.

Attic Insulation – adding insulation to your attic will minimize the heat that escapes from the living space into the attic. Additionally, electric outlets, plumbing vents, furnace stacks, and bathroom vents can allow heat to escape into the attic.
Roof Ventilation – inevitably, heat will get into your attic during winter months. Proper roof ventilation allows that heat to escape and prevents your roof deck from warming. The freeze-thaw process that results in ice damming is unlikely to occur on a roof that is properly ventilated.
Underlayments- such as Grace Roofing’s Ice & Water Shield and Owens Corning’s WeatherLock ice and water guard, protect the roof deck from ice dams by creating a water-tight barrier between the shingles and the roof deck, but do not prevent ice damming from occurring.

To learn more about Ice Dams Call Timberline at: 248-627-6470

Timberline Roofing & Siding , Proudly searving southeast Michigan since 1987!

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Timberline Roofing & Siding phone:248-627-6470
address:4770 Groveland Rd.
Ortonville, MI 48462