Flashing A Roof Dormer

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.

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. Roof dormer flashing details mistakes snafus. 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. 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.

Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it. The extra kick at the bottom of the face directs run off away from the structure. Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. This drip edge flashing provides protection from water damage along the eaves and rake of a roof.

Just as the source of a water leak can be difficult to detect the solution to solve it is usually multi faceted. Anywhere surfaces intersect on a roof is a prime spot for water seepage. In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details. Flashing provides the extra protection these spots need.

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. In this case an uninsulated dormer made it easy for moisture to seep inside.