What to do when you have any Ice Dam?

Roof Ice Dams: Formation, Prevention, and Remediation

What are Ice Dams?

Ice dams are ridges of ice that form along the edges of a roof, typically near the gutters. They occur when warm air from within the attic melts snow on the roof. This melted water then flows down the roof until it reaches a colder area, such as the eaves, where it refreezes. As more snow melts and refreezes, the ice dam grows, creating a barrier that traps water behind it.

Formation of Ice Dams

· Heat Loss from the Attic: Inadequate insulation and air sealing in the attic allow warm air to escape from the living space below. This heat warms the underside of the snow cover on the roof, causing it to melt.

· Poor Attic Ventilation: Insufficient ventilation prevents the escape of warm, moist air from the attic, contributing to the melting of snow.

· Snow Cover: A thick layer of snow acts as insulation, trapping heat from the attic, contributing to snowmelt.

· Temperature Fluctuations: Rapid temperature swings, with daytime warming and nighttime freezing, exacerbate ice dam formation.

Consequences of Ice Dams

· Water Intrusion: Trapped water can back up under shingles, leading to leaks that can damage ceilings, walls and insulation.

· Shingle Damage: The weight of the ice and the pressure of the trapped water can damage or dilodge shingles.

· Gutter Damage: Ice dams can put significant weight and pressure on the gutters, potentially causing damage

Preventing Ice Dams:

· Proper Attic Insulation: Ensure adequate insulation in the attic to minimize heat loss from the living space.

· Effective Air Sealing: Seal any air leaks in the attic to prevent warm air from escaping.

· Proper Ventilation: Install adequate attic ventilation to allow for proper air circulation and remove excess moisture.

· Regular Roof Inspections: Conduct regular roof inspections to identify and address potential issues.

· Snow Removal: Remove heavy snow loads from the roof as soon as possible