No Cut Valley Roofing

In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley.

No cut valley roofing.

It s sometimes called a california cut valley. 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. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.

It is popular because the two roof planes do not need to be shingled at the same time. It installs and looks almost the same as a regular cut valley where the shingles on the low volume roof plane are installed first and pass through the center of the valley by at least 12 in. From the valley center. If you go with closed valley require it be cut at the valley centerline some roofers push a couple of inches past the centerline so there is an extra layer in the valley bottom during low runoff flow but it leaves an underlapping edge with the 2 inch runup on the other side that water and debris pile up against and the water has no choice but to go under starting rot immediately down the center of the valley.

It is essential to only use whole not cut shingles during this step. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. Any one have experience with no cut valleys speed valley long island valley or california valley in the north sates such as north iowa to minnesota with steep roofs more like 14 12 the valley i refer to is this htt hellip. If you are looking to install shingles you might want to consider the closed cut valley method.

I begin the second side the side that will be cut by snapping a cutline 2 in. A chalk line is then used to strike a line from the top of the valley to the bottom of the valley. With a closed cut valley there s no need to shingle the two roof planes at the same time. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.

A valley shingle is then installed parallel to the centerline and offset a couple of inches.