Ice dam removal is a pain, so try to prevent them from forming in the first place. The key to preventing ice dams is simply to keep your attic and roof cold. After a snowfall, a cold roof will have a thick blanket of snow. A warmer roof, however, will soon have clear spots where the snow has melted off, and may well have icicles hanging from the eaves. To keep your roof cold, follow these three steps:
Close up attic bypasses
Measure your attic insulation level
Add roof and soffit vents
Full article below.
Ice Dams
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