Flashing In A Roof Valley

Shingle the other side of the valley the same way.

Flashing in a roof 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. Roof mastic applied along sides of valley flashing. Punctures in the center of the valley. This collection of 18 articles animations and videos identifies the critical roof flashing areas.

Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. 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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

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. From drip edge to valley flashing. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. That flashing is left exposed so the roof has visible lines of metal running down the valley.

Avoid the following common errors. There are two common methods for completing the flashing of a valley in a shingle roof system. 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.

Roof one side of the valley running the shingles across it. Closed cut valley fully replaced with new metal valley flashing.