Roof flashing is a thin material, usually made of metal such as aluminum, steel, or copper, installed to direct water away from critical areas of the roof. It is used wherever the roof intersects with vertical surfaces or penetrations.
Common locations for flashing include chimneys, skylights, vents, valleys, and wall junctions. These areas are highly susceptible to water infiltration due to changes in roof geometry.
Flashing works by creating a waterproof barrier that channels water away from seams and joints, preventing it from entering the underlying roof structure. It is layered with roofing materials to ensure complete protection.
There are several types of flashing, including step flashing, counter flashing, drip edge flashing, and valley flashing. Each type is designed for a specific application.
Proper installation of flashing is one of the most important factors in preventing roof leaks. Even a small failure in flashing can lead to significant water damage, including rot, mold, and interior ceiling damage.
