Ice Damming

Ice damming is a common winter roofing problem that occurs when snow on the roof melts and refreezes at the edges of the roofline. When the snow on the roof melts due to heat loss from the house, it flows down the roof until it reaches the overhang or eaves, where the roof is colder. This causes the water to freeze and form a dam of ice that prevents the melted snow from draining off the roof. The trapped water can then leak through the roof, damaging shingles, insulation, and causing water damage to the interior walls and ceilings of the house.

Ice dams can be caused by several factors, including inadequate roof insulation, poorly ventilated attics, warm air leaks from the living spaces, and external temperature fluctuations. Ice dams can be prevented by making sure that the attic is properly insulated and ventilated. Sealing any air leaks in the insulation and ducts that lead to the attic can also help prevent ice dams. Additionally, keeping the roof clean by removing snow and debris can prevent the ice from forming in the first place. Homeowners can also consider installing ice and water shield under the roofing material, a barrier that prevents water and ice from penetrating underneath the shingles.