The open woven and closed cut methods are demonstrated.
Shingle roof valley detail.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Valleys are a prime leak area so it s important to be careful.
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.
Closed valley s or open valleys.
Essentially there are three main ways to shingle a roof valley.
The open woven and closed cut methods are demonstrated.
On the first course across the valley the shingle from the larger or steeper roof plane overlaps the shingle from the smaller or shallower plane.
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.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
This video demonstrates the proper installation technique for installing roofing valleys.
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Water collects in a valley to flow off the roof.
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.