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Birth of an Ice Dam

Anatomy of a slow-motion roof wrecker.

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Birth of an Ice Dam

 

Birth of an Ice Dam

1. Heat collects in the attic and warms the roof, except at the eaves.

2. Snow melts on the warm roof and then freezes on the cold eaves.

3. Ice accumulates along the eaves, forming a dam. Meltwater from the warm roof backs up behind it, flows under the shingles, and into the house.

1. Heat collects in the attic and warms the roof, except at the eaves.

2. Snow melts on the warm roof and then freezes on the cold eaves.

3. Ice accumulates along the eaves, forming a dam. Meltwater from the warm roof backs up behind it, flows under the shingles, and into the house.

 
 

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