What is flashing?
Flashing is metal material installed where the roof meets chimneys, vents, valleys, and other protrusions to seal joints and prevent water intrusion.
Flashing refers to thin metal strips or sheets installed at joints and penetrations on a roof to block water from seeping into the structure beneath. These barriers are essential wherever the roof plane is interrupted, such as where chimneys rise through the roof, plumbing vents penetrate the surface, or roof valleys meet (the recessed channels where two roof planes converge). Without proper flashing, water running down the roof will pool and eventually find its way into walls, attics, and interior spaces, causing rot, mold, and structural damage.
Common flashing materials in the Greater Hartford area include:
- Aluminum - lightweight, affordable, and resistant to rust, widely used for vents and simple applications.
- Galvanized steel - durable and strong, though prone to corrosion over time and may require maintenance.
- Copper - long-lasting and develops a protective patina, but more expensive and typically reserved for high-end work.
- Lead - occasionally found on older chimneys; still effective but less common in new installations.
Proper flashing installation requires overlapping pieces so water sheds downward and outward, securing fasteners in ways that do not create additional leak points, and sealing gaps with appropriate caulk or sealant. Flashing failures are one of the most common sources of roof leaks, making inspection and repair a priority for homeowners experiencing water damage. Working with an experienced roof repair provider ensures flashing is installed or replaced correctly.