Flashing In A Roof Valley

Punctures in the center of the valley.

Flashing in a roof valley.

Stop nailing 6 inches from the center. That flashing is left exposed so the roof has visible lines of metal running down the valley. One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Avoid the following common errors. There are two common methods for completing the flashing of a valley in a shingle roof system.

Closed valleys or open valleys. From drip edge to 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. 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. Closed cut valley fully replaced with new metal valley flashing. Roof mastic applied along sides of valley flashing. Properly sized and installed valley flashing is key to channeling water safely off the roof.

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. Shingle the other side of the valley the same way.