Dormer Siding Flashing

In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details.

Dormer siding flashing.

We discuss the importance of keeping wood siding clear of the roof surface the need for flashing at the dormer side to roof intersection and the need for counter flashing at step flashing along the same roof wall intersection. Angle flashing provides a layer of protection between the wall s siding or brick and the roof s sheeting preventing the water from flowing back into the wall where it can cause mold or wood rot. In this case an uninsulated dormer made it easy for moisture to seep inside. Roof flashing is critical to keeping a house dry but people often get it wrong.

This article describes mistakes at roof dormer sidewall flashing and roof dormer sidewall coverings that invite leaks rot and insect damage on buildings. To read pdf files you need the adobe acrobat reader 6 0 or higher. Underlayment and peel and stick should go higher than the step flashing for. The residential dormer flashing is installed under your siding and on top of your roof at the bottom of a dormer or end wall.

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. Just as the source of a water leak can be difficult to detect the solution to solve it is usually multi faceted. Cover the connections with peel and stick membrane and then fold the synthetic underlayment up the wall also. Roofing underlayment can be installed on the roof but hold it back from the roof wall joint.

Here s an example of proper installation of dormer trim siding and flashing installed by crown builders siding and windows inc. Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it. 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. It is manufactured from premium steel coil.

Any missing or corroded flashing or flashing that has slid down the roof beneath the.