Understanding How Ice Dams Form

Ice dams are damaging to all types of roofing materials in Bergen County, NJ. When an attic is under-insulated with poor ventilation, melting snow causes water and ice to form on the eaves of the house. These ice dams can cause moisture buildup in the attic and down the walls, which can damage the rest of the house. Watch the video to learn how ice dams form on various roofing materials.

During the winter, heated air rises through the attic; if the attic is poorly-insulated, then that warm air can melt snow on the roof. As the snow melts down the roof shingles, the water refreezes above the eaves, where temperatures are cooler. This refreezing causes ice dams, which continue to build over the winter and can eventually cause significant water damage. Schedule a roof inspection to ensure there is enough insulation and ventilation in the attic.

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