How To Roof Over Metal Valley Flashing

Closed cut valley fully replaced with new metal valley flashing.

How to roof over metal valley flashing.

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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. In addition it is important to avoid nailing the shingles through the valley metal.

How to install roofing paper in a valley section and install the valley flashing on top. 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. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Open valleys have metal flashing to protect this critical area of the roof.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. However these shingles are not run entirely through the valley area but rather the center of the metal valley is left exposed. Avoid the following common errors. 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. Properly sized and installed valley flashing is key to channeling water safely off the roof. Fasteners placed in the exposed center area. Shingle the other side of the valley the same way.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Stop nailing 6 inches from the center. Roof mastic applied along sides of valley flashing. The top joinery of both valleys when they meet on the same plane of roof is shown here.

Roof one side of the valley running the shingles across it. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. This video shows the water proofing paper that we installed after re. 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.

As the asphalt shingles are installed over the roof deck the shingles are extended into the valley.