How To Install Tin Roof Valley

With a clean valley you can lay down some peel and stick roofing membrane.

How to install tin roof valley.

Lay the flashing down in the roof valley and start at the lower end of the roof. Shingle the other side of the valley the same way. These will stop the entry of rain wind and pests. Secure the screws but do not overtighten.

First clean the debris out of the valley including sawdust nails and whatever else is in there. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. 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. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. 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. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

The washer under the screw head should seal to the surface of the panel without bulging or shifting. Install the roofing screws vertically along each rib in the panel. Close or seal off the ends with a wood or plastic strip under the panel at each end. Use 1 inch galvanized roofing nails.

Use tape sealant between the valley trim and the panel. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Install an underlayment centered in the roof valley. Roof one side of the valley running the shingles across it.

Place them directly onto purlins that are attached to the roof trusses beginning on the outside edge. Attach the flashing panel in place at the bottom. Stop nailing 6 inches from the center.