When you have cut to a point opposite the top of the valley cut the rolled roofing straight up the main roof.
No cut valley roofing.
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.
You have to cut the shingles back to 1 inch from the centerline.
This layering will help direct the water into the valley and down the roof preventing leaks.
For a closed cut california valley a vertical run of strip shingles is installed along the chalk line end to end with the butt edge toward the valley.
The shingles on the cut edge plane are.
The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.
Closed cut valley even if i work toward the valley with three tab shingles cut valleys are faster than woven valleys hands down.
This cut down to the top of the ridge will let the 6 inch overlap lie flat in the far valley.
Leave this top end beyond the ridge loose.
For an open valley the installer should snap two chalk lines defining the cut edges of the valley on either side of the center line.
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.
Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled.
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.
Then rather than cutting the shingles on the high volume roof plane a row of shingles is installed with the exposure edge facing the valley center.
Then lay the shingles on the other side of the roof and again stretch them across the valley a little.
Make a cut back down into the roll from the cut edge to within v2 inch of the top of the ridge.
In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley.
No need for precise measurement.
A chalk line is then used to strike a line from the top of the valley to the bottom of the valley.
