Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks.
Open cut valley roofing.
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For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.
The metal is usually pre painted to best complement the shingles color blend.
When to choose a closed valley over an open valley.
With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
For a closed cut valley the installer should snap a chalk line 2 inches from the center line on the cut side.
With a clean valley you can lay down some peel and stick roofing membrane.
The closed cut valleys are cheaper and commonly done in my area but they tend to wear out sooner due to the high volume of water in the valley washing away the protective grit on the shingles there before on the rest of the roof.
I m leaning towards an open metal valley but i ve had contractors disagree saying that the metal expands.
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.
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.
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Roofing shingles are installed then cut and sealed where they overlap the metal channel.
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As another benefit to the roofing professional open valleys are sometimes used to easily bridge the gap between roof faces of vastly different pitches.
A basic demonstration for roofing contractors and homeowners on how to install gaf timberline shingles using the closed cut valley method.
The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.
