Flashing A Roof Dormer

Ideally this custom flashing will have soldered corners but if not carefully notch the metal at the dormer corners and wrap the vertical leg around the corner onto the side wall.

Flashing a roof dormer. Roof dormer flashing details mistakes snafus. Flashing provides the extra protection these spots need. 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. The extra kick at the bottom of the face directs run off away from the structure.

Flashing is installed to surround roof features such as vents chimneys and skylights. 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. In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details. In this case an uninsulated dormer made it easy for moisture to seep inside.

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. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. 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. Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it.

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. Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.