How To Roof Over Metal Valley Flashing

Open valleys have metal flashing to protect this critical area of the roof.

How to roof over metal valley flashing.

Roof one side of the valley running the shingles across it. Punctures in the center of the valley. That flashing is left exposed so the roof has visible lines of metal running down the valley. Stop nailing 6 inches from the center.

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. Properly sized and installed valley flashing is key to channeling water safely off the roof. As the asphalt shingles are installed over the roof deck the shingles are extended into the valley.

The top joinery of both valleys when they meet on the same plane of roof is shown here. With a clean valley you can lay down some peel and stick roofing membrane. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. In addition it is important to avoid nailing the shingles through the valley metal.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Closed cut valley fully replaced with new metal valley flashing. I have my valley custom made with water trough to help with leaking b. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. However these shingles are not run entirely through the valley area but rather the center of the metal valley is left exposed. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. This video shows the water proofing paper that we installed after re.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. How to install roofing paper in a valley section and install the valley flashing on top. Fasteners placed in the exposed center area. Roof mastic applied along sides of valley flashing.

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 this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs.