How To Install Flashing On Roof Valley

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.

How to install flashing on roof valley.

Many roofers cut the shingles across because they say it s safer. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Now nail this first flashing at both its far ends. Step 6 install the.

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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. No one of this affirmat.

Then install a non corrosive metal valley flashing of 24 minimum width. Roof one side of the valley running the shingles across it. Install an underlayment centered in the roof valley. Remember to caulk the underside of the flashing with a sealant.

Shingle the other side of the valley the same way. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Step 5 begin installation. Stop nailing 6 inches from the center.

Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation. 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.