How To Install Flashing On Roof Valley

Roof one side of the valley running the shingles across it.

How to install flashing on roof valley.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. No one of this affirmat. Remember to caulk the underside of the flashing with a sealant. 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.

W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. In this video i show you how i do the valleys on a shingle roof. Then install a non corrosive metal valley flashing of 24 minimum width.

Stop nailing 6 inches from the center. Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present. Shingle the other side of the valley the same way. Step 5 begin installation.

Install an underlayment centered in the roof valley. Now nail this first flashing at both its far ends. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

Step 6 install the. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.