Green Living

Why do ice dams build up on my roof?
Answered by Planet Green
  • Planet Green

    Planet Green

  1. If you have ice dams on your roof, it's a sign that you need to work on your home's energy efficiency. You probably have poor air sealing, inadequate ventilation and not enough insulation, which means that heat is escaping from your house and leaking into the attic.

    Heat flows up through the floor of your attic if it's not insulated well. Warm air also can leak through recessed lighting, fans, electrical boxes and attic stairs. When snow falls on a roof, it insulates the surface from the cold air of the outdoors. This combines with the warm air accumulated in the attic to heat the roof sheathing and shingles. The underside of the snow pile melts and the water freezes into ice dams. Water from the constantly melting snow can seep in under the shingles and cause a lot of damage to your home.

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