Yes, ice dams are one of the most damaging winter threats homeowners face. Left unaddressed, they lead to water entering the structure.
Yes, ice dams are one of the most damaging winter threats homeowners face. Left unaddressed, they lead to water entering the structure.
How ice dams form and what they do to roofs
- The Ice Dam Cycle: Snow melts on a warm roof deck and travels down the slope. It refreezes at the cold eaves and blocks more snowmelt from draining. Water backs up under shingle tabs and enters the home.
- Interior Water Damage Is Real: Once water reaches the warmer attic space, it doesn’t refreeze. Ceilings, insulation, and framing are all at risk from a single unaddressed ice dam.
- Insulation Damage Is Hidden: Wet insulation loses its effectiveness over time. Your heating bills rise before you realize what’s happening beneath the surface.
- Leak Barriers Are the First Defense: Leak barriers at the eaves block water from entering the roof deck. They’re required by code in most northern climates.
- Ventilation Breaks the Cycle: Proper attic ventilation lowers the roof deck temperature. Less surface snowmelt means fewer ice dams forming in the first place.
- Ice Dam Removal Costs Add Up: Ice dam removal can cost up to $4,000. Downstream roof leak repair can reach up to $24,000. Prevention is far less expensive than the cure.
- Ice Dams Occur Anywhere on the Roof: Eaves are the most common spot. Homes also see ice dams around chimneys, dormers, and roof valleys.
Protecting your home from ice dam damage
- Top Recommendation: A complete roofing system with leak barriers and Cobra Attic Ventilation. This stops ice dam formation before it starts.
- Best for Immediate Protection: Install StormGuard or Weather Watch leak barriers at the eaves. Any unprotected roof needs this.
- Best for Long-Term Prevention: Full roof replacement with the complete GAF 6-layer system. It’s the only reliable way to break the cycle.
Don’t wait for a ceiling stain. Contact Coastal Windows & Exteriors to evaluate your home’s ice dam risk during a free estimate.
Coastal Windows & Exteriors is a woman-owned GAF Master Elite roofing company. We’ve completed 7,000+ installations across MA, NH, and ME.
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Last Updated: July 2026
Sources:
- Ice dam removal can cost up to $4,000. Angi Ice Dam Removal Cost, Angi’s breakdown of ice dam removal costs and downstream repair expenses including roof leak repair. (2025)
- Roof leak repair following ice dam damage can reach up to $24,000. Angi Ice Dam Removal Cost, Angi’s breakdown of ice dam removal costs and downstream repair expenses including roof leak repair. (2025)
- Leak barriers installed at the eaves block water from entering the roof deck, particularly where ice dams form. GAF Ice Dams: Cause and Preventative Measures, GAF’s technical bulletin on the causes of ice dams and recommended preventative measures including leak barriers and ventilation. (2025)
- Proper attic ventilation lowers the roof deck temperature, reducing the snowmelt that causes ice dams to form. GAF Ice Dams: Cause and Preventative Measures, GAF’s technical bulletin on the causes of ice dams and recommended preventative measures including leak barriers and ventilation. (2025)
