Open Cut Valley Roofing

The metal is usually pre painted to best complement the shingles color blend.

Open cut valley roofing.

The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment. A roof valley is formed where two roof slopes meet. This article series discusses best practices in the selection and installation of residential roofing. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications.

People working on your roof especially less skilled trades or homeowners invariably use the valleys to walk on. We describe how to construct three common styles of roof valley. Essentially there are three main ways to shingle a roof valley. However it is said that provided the rest of the roofing shingles were properly installed and are performing properly open valleys will perform better over time than closed valleys.

Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. With a clean valley you can lay down some peel and stick roofing membrane. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. Repairs to closed valleys are a lot more involved than working on an open valley as is re roofing or making changes to a portion of your roof in the future.

Woven closed cut and open. When to choose a closed valley over an open valley. There are 4 main kinds of valley installation methods to explore for your roof. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. I begin the second side the side that will be cut by snapping a cutline 2 in. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Roofing shingles are installed then cut and sealed where they overlap the metal channel.

Water collects in a valley to flow off the roof. In this video we explore the california cut woven closed cut and open metal. Although the open valley is recommended by the manufacturer closed valley is acceptable. We don t normally offer this line although it is available.

The only type of valley that is unacceptable is the woven valley. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. With a closed cut valley there s no need to shingle the two roof planes at the same time. From the valley center.