Ice dams are created by heat loss. Insulation and air sealing are the only way to prevent the circumstances which lead up to the build up a nice big Maine ice dam.
The above image illustrates just how an ice dam is created.
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Does your roof look like this?
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You can rake your roof or put heaters above the soffits but those are only band-aids. Proper air sealing and high quality insulation are the cure.
