No Cut Valley Roofing

The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.

No cut valley roofing.

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. A type of cut valley common in many places appears cut but it s not. It s sometimes called a california cut valley. In my opinion no cut valleys are fast to install water resistant and beautiful.

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. 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. A chalk line is then used to strike a line from the top of the valley to the bottom of the valley. It is essential to only use whole not cut shingles during this step.

A valley shingle is then installed parallel to the centerline and offset a couple of inches. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. With the california cut valley shingles from the smaller roof slope are installed across the valley onto the adjacent slope. It is popular because the two roof planes do not need to be shingled at the same time.

As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. With a closed cut valley there s no need to shingle the two roof planes at the same time. In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley. From the valley center.

I begin the second side the side that will be cut by snapping a cutline 2 in.