Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.
Papering a roof valley.
The three methods to shingle a roof valley.
The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
Roll out the tar paper along the bottom edge of the roof.
To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together.
Cut it to fit your roof if.
The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection.
Woven valley shingle installation.