Flashing In A Roof Valley

Shingle the other side of the valley the same way.

Flashing in a roof valley.

This collection of 18 articles animations and videos identifies the critical roof flashing areas. Be sure to check local building codes to ensure you have the proper width for your application. Closed valleys or open valleys. 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 one side of the valley running the shingles across it. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. There are two common methods for completing the flashing of a valley in a shingle roof system.

When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. One of the details that varies between homes is the method of flashing the valley areas of the roof. Avoid the following common errors. W valley flashing protects the critical area of your roof where two slopes come together to form a valley.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Punctures in the center of the valley. 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. Roof mastic applied along sides of valley flashing.

That flashing is left exposed so the roof has visible lines of metal running down the valley. Stop nailing 6 inches from the center. Closed cut valley fully replaced with new metal valley flashing.