I then move the shingle to the uppermost course on the roof plane line up the mark on the shingle with the valley center and again mark the corner.
How to shingle a valley roof.
Extend the 3 tab shingles on one of the roof s planes past the valley at least 12 inches.
The next shingle should be directly atop the first one.
Valleys are a prime leak area so it s important to be careful.
Step 6 shingle valley.
Each successive shingle should be then placed with a six inch overlap or until the adhesive strip contacts the bottom of the shingle tabs.
To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof.
Secure all of the 3 tab shingles to the roof plane with the 1 inch roofing nails using the local building codes as a placement guide except for the shingles covering the flashing material.
The open woven and closed cut methods are demonstrated.
In order to shingle this kind of roof valley a roofing professional has to install both roof faces at the same time which is quite slow.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
From this starter shingle continue moving up the valley roof.