Metal Roof W Valley Installation

How to seal metal roof valley.

Metal roof w valley installation.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Shingle the other side of the valley the same way. Roof one side of the valley running the shingles across it. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

Install an underlayment centered in the roof valley. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Then install a non corrosive metal valley flashing of 24 minimum width. Best practices for sealing the metal roof valley vary based on the slope of the roof.

Cut the panels from the ground instead of on the roof to avoid damaging the roof with the debris. Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel. Stop nailing 6 inches from the center. Starting at the bottom fasten w valley trim flashing to purlins or substrate using 1 1 4 roofing nails 1 from trim edge every 24 on center.

W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side.