Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
Shingle roof valley.
Woven closed cut and open.
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A roof valley is formed where two roof slopes meet.
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.
Place the nails along the edge of the valley metal not into it.
The open woven and closed cut methods are demonstrated.
Essentially there are three main ways to shingle a roof valley.
From the stepped off main part of the roof run shingles into the valley and cut them square from where the bottom corner intersects with the shingles nailed along the valley line.
Valleys are a prime leak area so it s important to be careful.
One nail goes into the top section of the shingle where it covers the valley metal.
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 roof valleys gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.