Roof one side of the valley running the shingles across it.
How to install metal roof valley.
Stop nailing 6 inches from the center.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Shingle the other side of the valley the same way.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
With a clean valley you can lay down some peel and stick roofing membrane.
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Metal valley trim also known as metal valley flashing is beneficial because it drains water away from the structure of your metal building which helps prevent moisture damage.
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Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.
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Just simple 3d animated digital instructions on how to install a valley on a masterrib panel roof.