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Forms a dam at the roof edge
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- The bottom layer of snow or ice on the roof melts because of the heat. The melt water runs down the roof. The water freezes once it reaches the roof overhang, which is colder then the rest of the roof. That ice builds up and forms a dam at the roof edge.
www.caaquebec.com/en/advices/maintaining-a-home/ice-damming-on-roofs-zero-toleranceIce damming on roofs: zero tolerance! | CAA-Quebec - CAA-Québec
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Oct 22, 2024 · Ice dams occur when snow melts on a warm roof and the water refreezes across the eaves. As more water melts high up on the roof, it backs up behind the ice. When that water freezes, the dam grows further. Outdoors, the sheer weight of an ice dam can tear off your gutters or loosen your shingles.
Jan 10, 2024 · Heat from the home that escapes through gaps around the soffits, intake vents, or flashing can cause the snow on the roof to melt and form ice dams. DIYers can reduce the amount of heat flowing to the roof by sealing these gaps.
- Timothy Dale
Large icicles near your roof’s edge indicate a common winter problem for homeowners and tenants: ice dams. What’s an ice dam? After heavy snow and fluctuating temperatures, warm air from inside your home can escape through your attic or top floor, melting the snow on your roof.
An ice dam is caused on the roof of a building when a ridge of ice forms that prevents snow and melting snow from draining off the edge or down the eavestroughs. A freeze-thaw-freeze cycle can result in a large buildup of ice over time.
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Feb 4, 2019 · Why is there ice at the edge of your roof? This phenomenon is known as ice damming, and it happens when two conditions are met: Snow has built up on the roof; and; The temperature of the roof covering is above 0ºC. Most often, heat loss from the house is what causes the roof covering to warm up.
Feb 25, 2021 · An ice dam is a buildup of ice at the edge of a roof that prevents melted water from draining off the roof. When that melted water backs up behind the dam, it can work its way under the roof shingles, infiltrating your home and damaging ceilings, walls, and insulation.
Apr 23, 2024 · Roof ice dams happen when melted snow forms high ice ridges near the eaves. The ridges or dams trap water behind them, higher up toward the roof ridge.
