Essentially there are three main ways to shingle a roof valley.
Shingle roof valley detail.
Water collects in a valley to flow off the roof.
Closed valley s or open valleys.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
The open woven and closed cut methods are demonstrated.
One of the details that varies between homes is the method of flashing the valley areas of the roof.
A roof valley is formed where two roof slopes meet.
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Extend the end of each shingle at least 12 inches beyond the valley centerline and avoid placing any butt joints near the valley center.
Valleys are a prime leak area so it s important to be careful.
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.
This video demonstrates the proper installation technique for installing roofing valleys.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
How to shingle roof valleys gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Woven closed cut and open.