How To Install Metal Valley Flashing On Shingle Roof

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

How to install metal valley flashing on shingle roof.

Roof one side of the valley running the shingles across it. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Always be sure to refer to your local codes to see if they demand a particular kind of valley installation.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Open valley shingle installation. Many roofers cut the shingles across because they say it s safer. Indeed california valleys are prohibited in some areas.

Install an underlayment centered in the roof valley. Open valleys have metal flashing to protect this critical area of the roof. 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. In this video i show you how i do the valleys on a shingle roof.

No one of this affirmat. That flashing is left exposed so the roof has visible lines of metal running down the. Shingle the other side of the valley the same way. Then install a non corrosive metal valley flashing of 24 minimum width.

Then cover the entire roof with a layer of insulation and secure it with a staple gun. Drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Next use 1 inch nails to secure some metal edging to the perimeter of the roof.

An open valley relies on metal flashing for protection. Stop nailing 6 inches from the center.