How To Install Metal Flashing Roof Valley

Shingle the other side of the valley the same way.

How to install metal flashing roof valley.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. I have my valley custom made with water trough to help with leaking b. Now nail this first flashing at both its far ends. Install synthetic roofing.

Roof one side of the valley running the shingles across it. 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. Step 6 install the flashing. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

The top joinery of both valleys when they meet on the same plane of roof is shown here. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant. Stop nailing 6 inches from the center.

Remember to caulk the underside of the flashing with a sealant. Lay the flashing down in the roof valley and start at the lower end of the roof. Attach the flashing panel in place at the bottom. Use tape sealant between the valley trim and the panel.

Recommended procedures of basic valley flashing installation. 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. First clean the debris out of the valley including sawdust nails and whatever else is in there. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Use 1 inch galvanized roofing nails. Install an underlayment centered in the roof valley.