Roofing Valley Closed Cut

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. For a closed valley shingles are installed across the joint where planes intersect. With a closed cut valley there s no need to shingle the two roof planes at the same time.

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It is essential to only use whole not cut shingles during this step.

Roofing valley closed cut.

In general the closed cut valley method implies stretching one side of the shingles beyond the valley while those on the other side are trimmed. In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley. Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled.

I begin the second side the side that will be cut by snapping a cutline 2 in. Shingles are overlapped across the valley on alternative slopes. Tamko is the only shingle manufacturer that shows the no cut shingle valley process in their installation instructions. If you are looking to install shingles you might want to consider the closed cut valley method.

However open valleys may be susceptible to water back up along the top of the cut off shingles in the valley if not properly trimmed potentially causing roof leaks. Once covered the contractor moves to the side with a higher slope. Shingles are first installed on the side of the valley with a lower slope. It is popular because the two roof planes do not need to be shingled at the same time.

According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s. When it comes to your closed valley design there are a few options. From the valley center. In that case it wouldn t be a truly no cut valley but it would be faster than diagonally cutting each shingle.

With each new course roofing shingles continue up the valley. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. I think i first learned of the system reading a bundle of tamko shingles about 22 years ago and have used it frequently since.

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