Roof Valley Flashing Installation

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.

Roof valley flashing installation.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. No one of this affirmat.

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. Roof one side of the valley running the shingles across it. Step 5 begin installation. Flashing should be installed in all of the valleys.

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. Remember to caulk the underside of the flashing with a sealant. Now nail this first flashing at both its far ends. Shingle the other side of the valley the same way.

Step 6 install the. In this video i show you how i do the valleys on a shingle roof. 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.

Open valleys have metal flashing to protect this critical area of the roof. One of the details that varies between homes is the method of flashing the valley areas of the roof. Install an underlayment centered in the roof valley. Many roofers cut the shingles across because they say it s safer.

Closed valleys or open valleys. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Stop nailing 6 inches from the center.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Then install a non corrosive metal valley flashing of 24 minimum width. There are two common methods for completing the flashing of a valley in a shingle roof system.