Tired flashing and winter ice trigger many cases of a roof leak around the chimney. With 7,000+ installations completed since 2011, Coastal Windows & Exteriors is a GAF Master Elite roofing contractor and a woman-owned exterior remodeling company serving 730+ towns across Massachusetts, New Hampshire and Maine. Our crews trace chimney leaks to the flashing, crown or attic conditions behind them so the fix holds through winter. Here’s where chimney water usually gets in.
Where Chimney Water Finds Its Way In
- Flashing That’s Pulled Away: Metal flashing bridges the joint between masonry and shingles. Decades of hot summers and frozen nights can loosen its grip.
- Cracked Chimney Crown: The cap atop the masonry steers rain away from the brick. Once it cracks, water seeps downward and stains the rooms below.
- Ice Where Temperatures Shift: Ice dams can form anywhere roof surface temperatures change, not only at the eaves. Removal alone can cost up to $4,000.
- Costly Ripple Effects: Leak repair after ice damage can reach $24,000. Snow removal adds $200 to $700, and gutter cleaning runs $75 to $400.
- Cooler Attics, Fewer Leaks: Balanced ventilation keeps attic heat from melting rooftop snow. Pairing soffit intake vents with ridge exhaust keeps that airflow steady.
- Protective Upgrades: Heat cables cost $500 to $4,600, while snow guards range from $500 to $10,000. Either investment beats replacing a ruined ceiling.
- Stains Mean Act Now: Brown rings near the chimney signal trapped moisture above. Lingering condensation can lead to mold and soggy insulation.
Sealing Up the Chimney for Winter
Top Recommendation: New flashing with leak barrier around the chimney base during your next reroof.
Best for Budget: Flashing repair alone when surrounding shingles still have plenty of life.
Best for Ice-Heavy Winters: Balanced soffit and ridge ventilation that keeps attic temperatures low.
Seeing a stain creeping across the ceiling? Book roof leak repair before the next cold snap. Our GAF Master Elite crews respond fast and leave no mess behind. Every visit ends with photos and a clear plan.
Request a free roofing estimate from Coastal Windows & Exteriors.
Browse our complete roofing FAQ guide from Coastal Windows & Exteriors.
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Still have questions about what makes a roof leak around the chimney? See the areas we serve and talk to your local roofing contractor.
Last Updated: September 2026
Sources:
- Ice dam removal can cost up to $4,000. Angi Ice Dam Removal Cost, Angi’s cost breakdown for clearing ice dams. (2025)
- Roof leak repair following ice dam removal can cost up to $24,000. Angi Ice Dam Removal Cost, Angi’s figures on interior leak damage after winter ice. (2025)
- Snow removal costs $200 to $700, and gutter cleaning costs $75 to $400 after an ice dam. Angi Ice Dam Removal Cost, Angi’s list of cleanup expenses that follow ice dams. (2025)
- Heat cable installation costs $500 to $4,600, and snow guards cost $500 to $10,000. Angi Ice Dam Removal Cost, Angi’s pricing for preventive winter roof upgrades. (2025)
- Proper ventilation reduces condensation, which can result in mold and damaged insulation. GAF Best Roofing Materials and Colors for Energy Efficiency, GAF’s guidance on moisture control through attic airflow. (2024)
