This video demonstrates the proper installation technique for installing roofing valleys.
Shingle roof valley installation.
How to do it determine cuts.
Ensure ice and water protector has been installed along the valley first.
Place a piece of sheet metal under the shingles to make sure you will not damage the flashing.
Others start with a 3 inch wide.
To secure the roof valley flashing nail it down carefully.
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.
Snipping off the corners of.
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.
The open woven and closed cut methods are demonstrated.