Cut it to fit your roof if.
Papering a roof valley.
The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
The three methods to shingle a roof valley.
Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.
To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together.
Begin your first row of tar paper with the bottom of the tar paper slightly hanging over the edge of the roof.
Some homeowners prefer the consistent look that a woven valley provides.
Woven valley shingle installation.