With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.
No cut valley roofing.
A valley shingle is then installed parallel to the centerline and offset a couple of inches.
It is essential to only use whole not cut shingles during this step.
It s sometimes called a california cut valley.
The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.
With the california cut valley shingles from the smaller roof slope are installed across the valley onto the adjacent slope.
In my opinion no cut valleys are fast to install water resistant and beautiful.
Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled.
A chalk line is then used to strike a line from the top of the valley to the bottom of 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.
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.
In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley.
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 type of cut valley common in many places appears cut but it s not.
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.
With a closed cut valley there s no need to shingle the two roof planes at the same time.