Western Cut Roof Valley

The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.

Western cut roof valley.

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. These disadvantages are neutralized by their simplicity of installation. Further they wear out faster than a metal valley. 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. It is essential to only use whole not cut shingles during this step. Roofing shingles are installed then cut and sealed where they overlap the metal channel. I have my valley custom made with water trough to help with leaking b.

Alternatives for the closed cut valley installation are the woven metal open cut and long island installation. A chalk line is then used to strike a line from the top of the valley to the bottom of the valley. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet. This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment.