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