| 6. Ice damming is caused by
the melting and freezing of snow on your roof. Snow melts and
travels down the roof, then freezes up again, causing a ridge
or dam of ice. Once the ridge is established, each time a melt
occurs, the ridge holds back the water, allowing it to back up
the roof and freeze again, compounding the problem. This is one of many reasons why underlay is so important. |
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