Use a chalkline or align it by eye to make sure it is straight then drive roofing nails every foot or so to fasten it to the sheathing.
How to tar a roof valley.
I swear it is the fastest way out there.
Apply drip edge to the eave.
Ensure ice and water protector has been installed along the valley first.
Remove 8 inches of shingles at each side of the valley with a 16 inch nail bar.
Cut drip edge flashing at an angle at the corner press it lightly against the eave end not too hard or you will misshape it and drive a nail near the end.
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.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
While tar and gravel roofing or built up roofing systems have many positive aspects if you live in an area or the roof is in a location where it will receive strong sun exposure hot tar roofs will likely damage the roof s membrane if it is left uncovered or unevenly covered by the gravel.
Stop nailing 6 inches from the center.
Use a broad strip of felt paper felt paper should extend at least 10 inches up each side of the roof valley so use a strip between 20 and 24 inches wide.
To secure the roof valley flashing nail it down carefully.
A roof valley is very prone to leaks especially if you have an older roof.
Roof one side of the valley running the shingles across it.
Then i run a r.
Shingle the other side of the valley the same way.
Clear any debris in the roof valley and surrounding area.
Only nail at the edges with only enough nails to.
Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.
Then starting at the base of the.
Start at the upper row of shingles at the upper end of the valley.
Start at the top lay the felt paper from the top of the roof valley to the eaves at the roof edge.
This is how i paper my vallies.