Install Flashing On Roof Valley

Install an underlayment centered in the roof valley.

Install flashing on roof valley.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. One of the details that varies between homes is the method of flashing the valley areas of the roof. Now nail this first flashing at both its far ends. Roof one side of the valley running the shingles across it.

There are two common methods for completing the flashing of a valley in a shingle roof system. Closed valleys or open valleys. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

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

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. Step 6 install the. Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation. Flashing should be installed in all of the valleys. Drip flashing also called drip edge this type of flashing is installed on the edge of roofs and helps guide water away from your roof and into your gutters.

Valley flashing this flashing is usually formed in a v or w shape and is used where two different roof planes meet forming a valley. Then install a non corrosive metal valley flashing of 24 minimum width. 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. Remember to caulk the underside of the flashing with a sealant.