How To Install Tin Roof Valley

Install the roofing screws vertically along each rib in the panel.

How to install tin roof valley.

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. Stop nailing 6 inches from the center. Attach the flashing panel in place at the bottom.

Use 1 inch galvanized roofing nails. Lay the flashing down in the roof valley and start at the lower end of the roof. 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. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.

Roof one side of the valley running the shingles across it. Use tape sealant between the valley trim and the panel. First clean the debris out of the valley including sawdust nails and whatever else is in there. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. 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. Shingle the other side of the valley the same way.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Close or seal off the ends with a wood or plastic strip under the panel at each end. 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. With a clean valley you can lay down some peel and stick roofing membrane.

Place them directly onto purlins that are attached to the roof trusses beginning on the outside edge. Secure the screws but do not overtighten. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run.