How To Flash A Metal Roof Dormer

Slide the membrane up the roof along the wing wall placing it so that the half with the release paper is on the roof.

How to flash a metal roof dormer.

If you do not wish to form your own corner flashing you can buy pre bent pieces and cut them to size or use a piece of corrugated aluminum which is easier to bend. Bend the corner flashing tightly around the corner. The top joinery of both valleys when they meet on the same plane of roof is shown here. Since most ordinary homeowners do not have all the necessary know how or significant knowledge of basic roofing principles along with experience of working on an actual roof all day in the sun with the sweat pouring down the face as you work on flashing all the dormers chimneys and roof vents or shingling away for hours on end and doing it right taking on the installation of a metal roof.

One common method is to lay the edge metal under the eaves membrane and over the rake details concrete masonry roofing wrb flashing. Install metal flashing at every dormer roof to main roof connection. Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it. Place this in the valley on each side of a gable roof one edge laid on the gable roof with the other side nailed flat on the.

Both the peel and stick membrane and the underlayment should extend up the wall higher than the vertical leg of the step flashing. Because this type of metal flashing can t be soldered making a leak proof joint where the flashing turns the corner at the bottom of the dormer called for special attention but i have a detail that handled the situation nicely. Reach under the roof overhang and lift up the edge of the first piece of membrane and slide the cheek piece under the first piece of membrane. For photos and the four steps to flash a dormer click the view pdf button below.

I have my valley custom made with water trough to help with leaking b. Flashing a dormer in prattville al. 3 install roof shingles to the base of the dormer notching around the corners as needed. Step flashing on roof peak.