How To Install Tin Roof Valley

Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.

How to install tin roof valley.

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. Close or seal off the ends with a wood or plastic strip under the panel at each end. Install an underlayment centered in the roof valley. Roof one side of the valley running the shingles across it.

Secure the screws but do not overtighten. Use 1 inch galvanized roofing nails. These will stop the entry of rain wind and pests. 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.

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. 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.

First clean the debris out of the valley including sawdust nails and whatever else is in there. 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. With a clean valley you can lay down some peel and stick roofing membrane. 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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Install the roofing screws vertically along each rib in the panel. 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 the flashing down in the roof valley and start at the lower end of the roof. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Shingle the other side of the valley the same way.