Open Cut Valley Roofing

Essentially there are three main ways to shingle a roof valley.

Open cut valley roofing. People working on your roof especially less skilled trades or homeowners invariably use the valleys to walk on. Woven closed cut and open. 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. A roof valley is formed where two roof slopes meet.

The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment. With a clean valley you can lay down some peel and stick roofing membrane. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves.

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. I begin the second side the side that will be cut by snapping a cutline 2 in. Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. This article series discusses best practices in the selection and installation of residential roofing.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Closed valleys are very vulnerable to mechanical damage. There are 4 main kinds of valley installation methods to explore for your roof. Water collects in a valley to flow off the roof.

Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. With a closed cut valley there s no need to shingle the two roof planes at the same time. 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.

The only type of valley that is unacceptable is the woven valley. The metal is usually pre painted to best complement the shingles color blend. We don t normally offer this line although it is available. When to choose a closed valley over an open valley.

Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. From the valley center. Roofing shingles are installed then cut and sealed where they overlap the metal channel.