Flashing In A Roof Valley

To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

Flashing in a roof valley.

Closed cut valley fully replaced with new metal valley flashing. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Fasteners placed in the exposed center area. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.

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

There are two common methods for completing the flashing of a valley in a shingle roof system. One of the details that varies between homes is the method of flashing the valley areas of the roof. Roof mastic applied along sides of valley flashing. This collection of 18 articles animations and videos identifies the critical roof flashing areas.

Closed valleys or open valleys. From drip edge to valley flashing. That flashing is left exposed so the roof has visible lines of metal running down the valley. 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.

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. 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.