Western Cut Roof Valley

This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment.

Western cut roof valley.

Roofing shingles are installed then cut and sealed where they overlap the metal channel. Alternatives for the closed cut valley installation are the woven metal open cut and long island installation. Attach the valley in place with 1 1 4 inch roofing nails and a shingle hatchet or hammer. In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley.

As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment. The top joinery of both valleys when they meet on the same plane of roof is shown here. A chalk line is then used to strike a line from the top of the valley to the bottom of the valley.

I have my valley custom made with water trough to help with leaking b. Further they wear out faster than a metal valley. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet. Provided the rest of the roofing shingles were properly installed and are performing properly my experience has been that an open valley system holds up better over time tessaro says.