An ice dam is a ridge of ice that forms at the edge of a roof, typically along the eaves, and prevents melting snow from properly draining off the roof. The trapped water can back up under the shingles, leading to leaks, water damage to walls and ceilings, and even mold growth.
How Ice Dams Form:
- Heat Loss: Warm air from the attic melts the snow on the upper sections of the roof.
- Refreezing: The melted water flows down to the colder edges of the roof and refreezes, forming a dam.
- Water Backup: As more snow melts, water gets trapped behind the ice dam, eventually seeping under shingles and into the house.
How to Prevent Ice Dams:
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Improve Attic Insulation
- Keep the attic cold by sealing gaps and adding insulation to prevent heat from escaping.
- Aim for consistent temperatures across the roof to minimize melting and refreezing.
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Ensure Proper Ventilation
- Install soffit and ridge vents to allow cold air to circulate and keep the roof surface uniformly cold.
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Seal Air Leaks
- Seal gaps around chimneys, exhaust fans, and attic hatches to stop warm air from reaching the roof.
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Use Ice and Water Shield Membranes
- Install waterproof barriers under the roof shingles, especially along the eaves, to prevent leaks if ice dams form.
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Install Gutter Guards
- Gutter guards, like micromesh stainless steel guards offered by MARASUN, prevent debris buildup and allow water to flow freely, reducing ice formation in gutters.
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Clear Snow from the Roof
- Use a roof rake to safely remove snow buildup, especially after heavy snowfall, to prevent ice dam formation.
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Install Heat Cables
- Heat cables along the eaves and gutters can melt snow and ice, ensuring proper drainage.
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Ensure Proper Gutter Maintenance
- Keep gutters and downspouts clean and free of debris to allow melted snow to drain efficiently.
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