Water collects in a valley to flow off the roof.
Shingle roof valley.
Valleys are a prime leak area so it s important to be careful.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
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.
The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off.
The open woven and closed cut methods are demonstrated.
One nail goes into the top section of the shingle where it covers the valley metal.
Place the nails along the edge of the valley metal not into it.
A roof valley is formed where two roof slopes meet.
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How to shingle roof valleys gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
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.
Essentially there are three main ways to shingle a roof valley.