Roofing Valley Closed Cut

With each new course roofing shingles continue up the valley.

Roofing valley closed cut.

In that case it wouldn t be a truly no cut valley but it would be faster than diagonally cutting each shingle. With a closed cut valley there s no need to shingle the two roof planes at the same time. It is essential to only use whole not cut shingles during this step. 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.

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. I begin the second side the side that will be cut by snapping a cutline 2 in. Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. Shingles are overlapped across the valley on alternative slopes.

For a closed valley shingles are installed across the joint where planes intersect. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. Once covered the contractor moves to the side with a higher slope. From the valley center.

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. It is popular because the two roof planes do not need to be shingled at the same time. If you are looking to install shingles you might want to consider the closed cut valley method. In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley.

I think i first learned of the system reading a bundle of tamko shingles about 22 years ago and have used it frequently since. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. Tamko is the only shingle manufacturer that shows the no cut shingle valley process in their installation instructions.