Flashing In A Roof Valley

Closed cut valley fully replaced with new metal valley flashing.

Flashing in a roof valley. Punctures in the center of the valley. Roof mastic applied along sides of valley flashing. Roof one side of the valley running the shingles across it. 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.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Avoid the following common errors. Properly sized and installed valley flashing is key to channeling water safely off the roof. 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.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Fasteners placed in the exposed center area. 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. Stop nailing 6 inches from the center.

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