Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.
Shingle roof valley.
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A roof valley is formed where two roof slopes meet.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
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.
The open woven and closed cut methods are demonstrated.
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.
Essentially there are three main ways to shingle a roof valley.
How to shingle roof valleys gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
Woven closed cut and open.
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.
Water collects in a valley to flow off the roof.
Valleys are a prime leak area so it s important to be careful.