Quote:
Originally Posted by Merrymeeting
If you have a lot of ice dams and huge icicles now, then your problem is definitely one of a roof that is too warm (i.e., lack of insulation).
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Agreed, warmth reaching the roof deck is causing the melting, but even with adequate insulation, air leakage from the heated space below will carry interior heat through porous insulation (fiberglass, cellulose), and that more often is the problem. First do an air sealing job to prevent the leaks, then, if there is room, add insulation.