First clean the debris out of the valley including sawdust nails and whatever else is in there.
Using paper in a roof valley.
Closed cut valleys also called closed valleys are installed.
Start at the top.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
No matter which valley method you use for extra protection apply wsu at a valley.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
You can center it and align it smoothly with the roof contours as you go down.
Closed cut shingle valley installation.
Lay the felt paper from the top of the roof valley to the eaves at the roof edge.
The three methods to shingle a roof valley.
Snap chalklines on both sides for guides.
Use a broad strip of felt paper.
Woven valley shingle installation.
To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them.
Roll out and smooth the wsu and drive a few nails on one side to hold it temporarily.