On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel.
Papering a roof valley.
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.
Some homeowners prefer the consistent look that a woven valley provides.
The three methods to shingle a roof valley.
Woven valley shingle installation.
Cut it to fit your roof if.
Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.