Flashing In A Roof Valley

Roof one side of the valley running the shingles across it.

Flashing in a roof valley.

Avoid the following common errors. One of the details that varies between homes is the method of flashing the valley areas of the roof. Stop nailing 6 inches from the center. Shingle the other side of the valley the same way.

Fasteners placed in the exposed center area. 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. Roof mastic applied along sides of valley flashing. 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.

Closed cut valley fully replaced with new metal valley flashing. From drip edge to valley flashing. There are two common methods for completing the flashing of a valley in a shingle roof system. Punctures in the center of the valley.

Lay one and two tab shingles as you near the valley so full size shingles will run across 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. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. This collection of 18 articles animations and videos identifies the critical roof flashing areas.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Closed valleys or open valleys.