The reason why the roof valley is such a sensitive area has to do with all the rainwater and or melting snow that accumulates and flows through the valley on its way into the gutters.
Roof valley tar.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system.
This is how i paper my vallies.
I swear it is the fastest way out there.
The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
Then i run a r.
Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.
Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.
Take a close look at how i paper the 30 in the center of the valley.
A roof valley is formed where two roof slopes meet.
Woven closed cut and open.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
Essentially there are three main ways to shingle a roof valley.
Stop nailing 6 inches from the center.
Move to the highest end of the valley and work your way down cleaning shingles from both sides of the valley whether they re damaged or not.
Clear any debris in the roof valley and surrounding area.