Metal Roof W Valley Installation

Roof one side of the valley running the shingles across it.

Metal roof w valley installation.

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. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Stop nailing 6 inches from the center. Best practices for sealing the metal roof valley vary based on the slope of the roof.

Shingle the other side of the valley the same way. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Cut the panels from the ground instead of on the roof to avoid damaging the roof with the debris. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

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. How to seal metal roof valley. Then install a non corrosive metal valley flashing of 24 minimum width. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel.