Open Cut Valley Roofing

With a clean valley you can lay down some peel and stick roofing membrane.

Open cut valley roofing.

For an open valley the installer should snap two chalk lines defining the cut edges of the valley on either side of the center line. A basic demonstration for roofing contractors and homeowners on how to install gaf timberline shingles using the closed cut valley method. As another benefit to the roofing professional open valleys are sometimes used to easily bridge the gap between roof faces of vastly different pitches. I m leaning towards an open metal valley but i ve had contractors disagree saying that the metal expands.

Learn more at http. Fold the top over the roof ridge and cut the bottom along the drip edge metal. When to choose a closed valley over an open valley. The metal is usually pre painted to best complement the shingles color blend.

If homeowners are looking to have their roof last for many years an open valley is iko s recommended choice and a good up sell opportunity for the roofing professional. The valley lining whether asphalt or metal should have 6 inches open at the top 3 inches on either side of the valley centerline and increase by 1 8 inch for each foot of valley length to accommodate the greater flow further down the valley. The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment. For a closed cut valley the installer should snap a chalk line 2 inches from the center line on the cut side.

Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. 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. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Open 6 30 am to 4 30 pm mon fri check branch locations below for sat hours.

Jb wholesale roofing and building supply has 8 locations to serve everything you need for your roof whether residential or commercial. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.