Roof flashing is a thin metal barrier that seals joints and transitions where water is most likely to penetrate. It’s one of the most critical — and most overlooked — components of any roofing system.
Roof flashing is a thin metal barrier that seals joints and transitions where water is most likely to penetrate. It’s one of the most critical — and most overlooked — components of any roofing system.
What Flashing Does and Where It Lives
- Flashing Seals the Vulnerable Points: Every place your roof changes direction or meets a wall, chimney, skylight, or vent is a potential leak entry point. Flashing covers these transitions and channels water away from the structure.
- Where You’ll Find It: Common flashing locations include chimney bases, roof valleys, skylights, vent pipes, and side walls. Each requires precise installation to perform correctly.
- Poorly Installed Flashing Is a Top Cause of Leaks: Many roof leaks originate at flashing joints — not at the shingles themselves. This is true on Chestnut Hill’s older Colonial and Tudor-style homes with complex rooflines.
- Flashing Materials Matter: Quality flashing uses durable metals that resist corrosion and expand and contract with temperature changes. Massachusetts temperature swings make this critical.
- Flashing Works With the Full System: Our GAF 6-layer approach treats flashing as part of a complete waterproofing strategy — not an afterthought. Leak Barrier Protection and Roof Deck Protection work alongside flashing for complete coverage.
- Inspect After Every Major Storm: Flashing can lift, crack, or separate over time. A post-storm inspection catches flashing issues early, before water reaches your interior ceiling.
- A Top Roofing Service Includes Flashing Assessment: Every top roofing service in Chestnut Hill, MA we complete includes a full review of existing flashing conditions before installation begins.
Flashing Recommendations for Chestnut Hill Homeowners
Top Recommendation: Have flashing inspected any time your roof is over 15 years old or after a major storm — especially on homes with dormers or chimneys.
Best for Older Chestnut Hill Homes: Full flashing replacement paired with a complete roof replacement in Chestnut Hill, MA for a fully integrated waterproofing system.
Best for Peace of Mind: Schedule a free inspection with our certified team to assess your roof’s current flashing condition.
Concerned about your roof’s flashing? Reach out to Coastal Windows & Exteriors for a free evaluation today.
- Request a free roofing estimate from Coastal Windows & Exteriors.
- Browse our complete roofing FAQ guide from Coastal Windows & Exteriors.
- Explore our Roofing Exterior Remodeling Home Improvement Help Center.
Last Updated: April 2026
Sources:
- Asphalt shingles cost $4.46 per square foot on average nationally. This Old House Roofing Facts and Statistics, roofing material cost data and industry statistics for homeowners. (2025)
