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