Jul 28, 2021 · Frost and ice forms in attics when warm, humid air accumulates and condenses on the underside of your roof sheathing. Depending on the temperature, and the insolation (ie. can sun get to the roof) you will have either frost or water collecting.

Feb 4, 2025 · Melting frost can lead to deteriorated roof sheathing, mold on the roof sheathing, wet insulation, and water stains on the ceilings. Frost gets into the attic from air leaks, or attic bypasses.

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 27, 2024 · Ice damming is the accumulation of frozen water that collects at the edge of a roof after it snows. When the air inside an attic is warm, that warmth can transfer through the roof and begin to...

Home technology expert Ross Trethewey shows how to use attic insulation to prevent ice dams from forming on a roof.

Attic frost, which appears as ice or frost buildup on the underside of your roof, is a common issue in cold climates. This occurs when warm, moist air from your living spaces rises into the attic, comes into contact with cold surfaces, and condenses into frost.

Winter in colder climates often means snow-covered roofs, but hidden threats like ice dams and attic condensation can cause serious damage to your home. This guide explains why these problems occur, how to recognize them, and what you can do to prevent and fix them.

Feb 10, 2025 · You also need to have proper ventilation in your attic to avoid uneven heat on your roof’s surface. Proper ventilation cools your attic by drawing in cold air and pushing warm air out naturally. Waterproof Barriers. If you’re replacing your roof, we can add ice dam prevention products such as an ice and water barrier.

Mar 18, 2025 · Carefully remove any existing ice dams using a roof rake or calcium chloride de-icer (avoid using rock salt, as it can damage shingles). Improve attic insulation and ventilation to maintain a consistent roof temperature and prevent future ice dams. Ensure gutters and downspouts are clear of debris to allow proper water drainage. 2.

Oct 7, 2024 · Ice dams and icicles form when the snow melts, runs down your roof and refreezes near the edge. This only occurs when part of your roof warms to above 32 degrees F, warm enough to melt the snow, while the roof edge remains below freezing. This scenario is often the result of a warm attic.