How To Install Tin Roof Valley

Close or seal off the ends with a wood or plastic strip under the panel at each end.

How to install tin roof valley. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Secure the screws but do not overtighten. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Place them directly onto purlins that are attached to the roof trusses beginning on the outside edge.

Lay the flashing down in the roof valley and start at the lower end of the roof. 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. 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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies.

The washer under the screw head should seal to the surface of the panel without bulging or shifting. Roof one side of the valley running the shingles across it. Attach the flashing panel in place at the bottom. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run.

These will stop the entry of rain wind and pests. Install the roofing screws vertically along each rib in the panel. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant. Install an underlayment centered in the roof valley.

First clean the debris out of the valley including sawdust nails and whatever else is in there. Use 1 inch galvanized roofing nails. Use tape sealant between the valley trim and the panel.