You can use a straight edge to achieve a straight cut.
How to shingle a roof valley video.
The most common closed valley is a closed cut valley where shingles are installed on the entire roof area on one side of the valley first with each shingle course extending at least 12 through the valley centerline.
The open woven and closed cut methods are demonstrated.
Nail down each valley shingle at least two inches 50 mm back from the chalk line.
Over driving nails is always a.
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.
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.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
Valleys are a prime leak area so it s important to be careful.
Asphalt shingles roofing how to install valley by roofrepair101 more about roof installation at.
As shingles are installed on the adjoining roof area the end of each course of shingles is trimmed cut 2 back of.
This video demonstrates the proper installation technique for installing roofing valleys.