Flashing In A Roof Valley

Avoid the following common errors.

Flashing in a roof valley.

Shingle the other side of the valley the same way. December 25 2018 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. Roof one side of the valley running the shingles across it. Stop nailing 6 inches from the center.

There are two common methods for completing the flashing of a valley in a shingle roof system. This collection of 18 articles animations and videos identifies the critical roof flashing areas. Properly sized and installed valley flashing is key to channeling water safely off the roof. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.

Closed valleys or open valleys. Roof mastic applied along sides of valley flashing. That flashing is left exposed so the roof has visible lines of metal running down the valley. To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Valley flashing is metal or sometimes peel and stick material that protects an important area on the roof where two slopes come together to form a valley. From drip edge to valley flashing. Punctures in the center of the valley.

Fasteners placed in the exposed center area. One of the details that varies between homes is the method of flashing the valley areas of the roof.