As the melted and frozen snow continues to freeze, melt, and refreeze, it creates a barrier, or dam, preventing water from running off the roof. Once dammed, water and ice can creep back up under the shingles and underlayment resulting in leaks.
Proper ventilation and added insulation help mitigate this melting and freezing process and eliminate ice dams. Ice dams may not be a large concern at sea level, but in homes at higher elevations and inland this can be a serious issue.
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