Pros of woven valley shingle installations.
Roof valley shingle weave.
Here we have a laminated shingle roof that has been installed with a woven valley detail.
All of the shingle rows will need to be lined up correctly.
Water has a small chance of even getting up under the woven valley shingles even though it flows in either direction.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
One of the details that varies between homes is the method of flashing the valley areas of the roof.
So if you are installing a woven valley you must push the shingles snugly into the valley while not nailing within six inches of the valley center.
The woven valley shingle installation method does not call for roofing cement relying instead on the weave pattern to protect from water infiltration.
Woven valleys should only be used with strip shingles.
Closed valleys or open valleys.
There are two common methods for completing the flashing of a valley in a shingle roof system.