What is the term for the triangular shape at the bottom of a California cut valley?

The term for the triangular shape at the bottom of a California cut valley is the shingle butt. This refers specifically to the angle created where the roofing shingles meet at the valley, forming a distinct triangular shape that helps direct water runoff toward the gutter system.

The design of the California cut valley is intended to enhance drainage and minimize the potential for water pooling, which can lead to leaks or water damage. The shingle butt is crucial in ensuring that water flows effectively away from the roof system and into the gutters, helping maintain the integrity of the roofing structure over time.

The other terms mentioned have their own specific meanings in roofing terminology. Valley pan refers to a metal flashing installed at the valley to further protect against leaks. Rafter tail describes the portion of the rafter that extends beyond the wall, often finished with fascia board. Gutter edge pertains to the part of the roof where the gutters are attached, not the triangular shape formed at the bottom of a valley. Understanding these definitions helps in identifying roofing components and their functions correctly.