How To Install Metal Flashing Roof Valley

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

How to install metal flashing roof valley.

Attach the flashing panel in place at the bottom. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Now nail this first flashing at both its far ends. The top joinery of both valleys when they meet on the same plane of roof is shown here.

Install synthetic roofing. Steep slope roofs slope greater than 3 12 cut the panels at an angle for the valley then bend the hem end of the panel and hook it with a cleat. Use tape sealant between the valley trim and the panel. First clean the debris out of the valley including sawdust nails and whatever else is in there.

Install an underlayment centered in the roof valley. Recommended procedures of basic valley flashing installation. Stop nailing 6 inches from the center. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Apply an approximately 3 inch. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Use 1 inch galvanized roofing nails. Shingle the other side of the valley the same way.

Roof one side of the valley running the shingles across it. Lay the flashing down in the roof valley and start at the lower end of the roof. Remember to caulk the underside of the flashing with a sealant. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.

Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present. Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps.