Open Cut Valley Roofing

One nail goes into the top section of the shingle where it covers the valley metal. 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. 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.

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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.

Open cut valley roofing.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. For a closed cut valley the installer should snap a chalk line 2 inches from the center line on the cut side.

The underlayment sheet metal liner if required and initial shingle covering into or through the valley follow the same guidelines for the standard closed cut valley and open valley construction. It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves. I m leaning towards an open metal valley but i ve had contractors disagree saying that the metal expands. From the stepped off main part of the roof run shingles into the valley and cut them square from where the bottom corner intersects with the shingles nailed along the valley line.

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. 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. The rest of the nails go in the nailing strip. Although the open valley is recommended by the manufacturer closed valley is acceptable.

With a clean valley you can lay down some peel and stick roofing membrane. The only type of valley that is unacceptable is the woven valley. As another benefit to the roofing professional open valleys are sometimes used to easily bridge the gap between roof faces of vastly different pitches.