Papering A Roof Valley

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