Flashing In A Roof Valley

Closed cut valley fully replaced with new metal valley flashing.

Flashing in a roof valley.

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

From drip edge to valley flashing. Closed valleys or open valleys. One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. 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. Avoid the following common errors. There are two common methods for completing the flashing of a valley in a shingle roof system.

Roof one side of the valley running the shingles across it. Punctures in the center of the valley. Properly sized and installed valley flashing is key to channeling water safely off the roof. 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. Stop nailing 6 inches from the center.