Ice dams are ridges of ice that form at your roof’s edge, blocking melting snow from draining properly.
Ice dams are ridges of ice that form at your roof’s edge, blocking melting snow from draining properly.
Here’s how it works. Ice dams develop when warm attic air heats the roof surface, melting snow that refreezes at the colder eaves. Left untreated, ice dams can cause roof leak repairs costing up to $24,000.
Proper ventilation and leak barriers are your best defense against ice dam damage.
What New England Homeowners Need to Know About Ice Dams:
- How Ice Dams Form: Warm air escaping through a poorly ventilated attic heats the roof deck. Snow melts, runs toward the eaves, and refreezes — creating a dam that traps water against your roof.
- Ventilation Is the Root Solution: Proper roof ventilation lowers attic temperature, reducing snow melt that causes ice dams. GAF’s Cobra® Ridge Vent exhausts warm air while MasterFlow® Intake Soffit Vents bring in fresh, cool air.
- Leak Barriers Protect Your Roof Deck: Leak barrier membranes are installed at the eaves — exactly where ice dams form — preventing water from penetrating your roof deck and interior structure.
- Ice and Water Shield Installation: Coastal Windows & Exteriors installs GAF-approved leak barriers as part of every comprehensive roofing system. This isn’t a patch — it’s built-in protection from day one.
- The Real Cost of Ignoring Ice Dams: Removal alone can cost up to $4,000. Follow-up repairs — including shingle repairs from $130–$9,000 and roof leak repairs up to $24,000 — add up fast.
- Additional Costs to Expect: After ice dam removal, homeowners often face snow removal ($200–$700), gutter cleaning ($75–$400), and heat cable installation ($500–$4,600).
- When to Call a Professional: If you see water staining on interior ceilings or walls after a storm, ice dams have already caused damage. Professional assessment is critical before the next freeze cycle.
Your Best Defense Against Ice Dam Damage:
Best Overall Protection: A complete GAF roofing system with home roof ventilation — Cobra® Ridge Vent plus MasterFlow® Intake Soffit Vents — combined with leak barrier installation at the eaves.
For Immediate Concerns: Professional ice dam removal addresses the current threat. Removal costs up to $4,000 — far less than the structural repairs that follow if ignored.
Smartest Long-Term Investment: A full roof replacement with integrated ventilation and leak barriers eliminates the conditions that create ice dams in the first place.
Ready to stop ice dams before they start? A properly ventilated, fully protected roof is the only permanent solution. Coastal Windows & Exteriors is the only woman-owned GAF Master Elite contractor in the U.S., with 7,000+ installations across MA, NH, and ME. Let’s build a roof that handles everything New England throws at it.
Request a free roofing estimate from Coastal Windows & Exteriors.
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Last Updated: April 2026
Sources:
- Proper ventilation lowers the attic temperature, which reduces the melting of snow on the roof surface that causes ice dams. GAF Ice Dams: Cause and Preventative Measures, GAF’s technical bulletin on the causes of ice dams and recommended preventative roofing measures. (2025)
- Leak barriers installed at the eaves during roof replacement prevent water infiltration through the roof deck. GAF Ice Dams: Cause and Preventative Measures, GAF’s technical guidance on leak barrier installation as a protective measure against ice dam water infiltration. (2025)
- Ice dam removal can cost up to $4,000. Angi Ice Dam Removal Cost, Angi’s cost guide covering ice dam removal pricing and related repair expenses for homeowners. (2025)
- Shingle repairs after ice dam damage can range from $130 to $9,000. Angi Ice Dam Removal Cost, Angi’s itemized breakdown of shingle repair costs associated with ice dam damage. (2025)
- Roof leak repairs following ice dam damage can reach up to $24,000. Angi Ice Dam Removal Cost, Angi’s breakdown of downstream repair costs homeowners may face after ice dam damage. (2025)
- Snow removal from the roof costs between $200 and $700. Angi Ice Dam Removal Cost, Angi’s pricing guide for roof snow removal to reduce ice dam risk. (2025)
- Gutter cleaning following ice dam removal typically costs between $75 and $400. Angi Ice Dam Removal Cost, Angi’s guide to post-ice-dam cleanup costs including gutter maintenance. (2025)
- Heat cable installation to prevent ice dams runs between $500 and $4,600. Angi Ice Dam Removal Cost, Angi’s cost data on heat cable installation as a preventative measure against ice dam formation. (2025)
