How To Install Tin Roof Valley

Place them directly onto purlins that are attached to the roof trusses beginning on the outside edge.

How to install tin roof valley.

The washer under the screw head should seal to the surface of the panel without bulging or shifting. Install an underlayment centered in the roof valley. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Lay the flashing down in the roof valley and start at the lower end of the roof.

Roof one side of the valley running the shingles across it. 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. Install the roofing screws vertically along each rib in the panel. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

Secure the screws but do not overtighten. With a clean valley you can lay down some peel and stick roofing membrane. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Shingle the other side of the valley the same way.

These will stop the entry of rain wind and pests. Use tape sealant between the valley trim and the panel. Attach the flashing panel in place at the bottom. Stop nailing 6 inches from the center.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Use 1 inch galvanized roofing nails. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof.

Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. 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. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.