How To Install Flashing On Roof Valley

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

How to install flashing on roof valley.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Remember to caulk the underside of the flashing with a sealant. 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.

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. Learn the three methods of shingling a roof valley the advantages and disadvantages of each how to choose valley flashing and how to shingle an open valley. Many roofers cut the shingles across because they say it s safer. Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation.

Shingle the other side of the valley the same way. In this video i show you how i do the valleys on a shingle roof. Step 5 begin installation. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Roof one side of the valley running the shingles across it. 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. Install an underlayment centered in the roof valley. Stop nailing 6 inches from the center.

Then install a non corrosive metal valley flashing of 24 minimum width. Now nail this first flashing at both its far ends.