Roof Valley Flashing Installation

Shingle the other side of the valley the same way.

Roof valley flashing installation.

No one of this affirmat. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. 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. In this video i show you how i do the valleys on a shingle roof. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Flashing should be installed in all of the valleys.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. Then install a non corrosive metal valley flashing of 24 minimum width. Step 6 install the. 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.

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. Roof one side of the valley running the shingles across it. Install an underlayment centered in the 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.

Step 5 begin installation. There are two common methods for completing the flashing of a valley in a shingle roof system. Closed valleys or open valleys. 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.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Open valleys have metal flashing to protect this critical area of the roof. Remember to caulk the underside of the flashing with a sealant.

One of the details that varies between homes is the method of flashing the valley areas of the roof. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation.