Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
How to install metal roof valley.
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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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Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
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Fold the top over the roof ridge and cut the bottom along the drip edge metal.
Roof one side of the valley running the shingles across it.
Shingle the other side of the valley the same way.
Masterrib is a 36 wide 5 r.
When installing metal valley flashing there are a few things to keep in mind from cutting metal roofing to sealing the flashing.
Just simple 3d animated digital instructions on how to install a valley on a masterrib panel roof.