Flashing A Roof Dormer

Anywhere surfaces intersect on a roof is a prime spot for water seepage.

Flashing a roof dormer.

In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it. These problem areas include the edges of skylights and chimneys soil stacks vent fans and roof valleys as well as the intersection of the roof deck and dormer walls.

Just as the source of a water leak can be difficult to detect the solution to solve it is usually multi faceted. Flashing is installed to surround roof features such as vents chimneys and skylights. While the gold standard for roof flashing is soldered copper the fact is that for economic reasons the vast majority of roof flashing is done with aluminum. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.

Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. In this case an uninsulated dormer made it easy for moisture to seep inside. Flashing provides the extra protection these spots need. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.

Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. Add a hole and improper flashing from a recent roof installation to the mix and the water had an open invitation to run into the house. Tim healey to protect this vulnerable juncture from water intrusion and rot install solid blocking at the eaves to provide a substrate for peel and stick flashing then install the flashing shingle fashion to protect against water ice and snow.