Flashing In A Roof Valley

Closed valleys or open valleys.

Flashing in a roof valley.

Roof one side of the valley running the shingles across it. Avoid the following common errors. 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. Punctures in the center of the valley.

Roof mastic applied along sides of valley flashing. One of the details that varies between homes is the method of flashing the valley areas of the roof. Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing is used. Closed cut valley fully replaced with new metal valley flashing.

Stop nailing 6 inches from the center. 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. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

This collection of 18 articles animations and videos identifies the critical roof flashing areas. Fasteners placed in the exposed center area. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Properly sized and installed valley flashing is key to channeling water safely off the roof.

There are two common methods for completing the flashing of a valley in a shingle roof system. That flashing is left exposed so the roof has visible lines of metal running down the valley.