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Roof de-icing cable prevents water and ice damage by providing a clear path for melting water. It keeps roof edges, gutters and downspouts ice-free. Even in below freezing weather, snow on the roof will often thaw because of heat from the sun and heat loss from the house through the roof. As this melted snow reaches the gutter it refreezes. Here there is no heat loss from the house to warm and melt the snow/ice. As this melted snow refreezes again and again in the gutter, an ice dam is formed. Soon water backs up under shingles, and leaks into the house.
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