First clean the debris out of the valley including sawdust nails and whatever else is in there.
How do you do a valley with metal roofing.
Closed cut shingle valley installation.
Closed cut valleys also called closed valleys are installed.
Best practices for sealing the metal roof valley vary based on the slope of the roof.
Apply two beads of roofing cement to attach the top layer shingles to the bottom layer shingles.
With a clean valley you can lay down some peel and stick roofing membrane.
The three methods to shingle a roof valley.
Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel.
Cut corners and apply cement dub cut the top layer shingles see step 4 in open metal valley above.
Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.
Install synthetic roofing.
Also apply cement to attach the top layer shingles to each other see steps 5 and 6 in open metal valley above.