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.

Stop nailing 6 inches from the center. 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. Roof one side of the valley running the shingles across it. Fasteners placed in the exposed center area.

How to install roofing paper in a valley section and install the valley flashing on top. I have my valley custom made with water trough to help with leaking b. 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.

In addition it is important to avoid nailing the shingles through the valley metal. Fold the top over the roof ridge and cut the bottom along the drip edge metal. With a clean valley you can lay down some peel and stick roofing membrane. Avoid the following common errors.

This video shows the water proofing paper that we installed after re. However these shingles are not run entirely through the valley area but rather the center of the metal valley is left exposed. Properly sized and installed valley flashing is key to channeling water safely off the roof. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. As the asphalt shingles are installed over the roof deck the shingles are extended into 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. Shingle the other side of the valley the same way.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Punctures in the center of the valley. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.

The top joinery of both valleys when they meet on the same plane of roof is shown here.