Common Roof Pitch Angles Used By Builders

Roof pitch designations are comprised of two numbers indicating a ratio.

Common roof pitch angles used by builders.

Roof pitch defined and explained. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. Roof pitch is a measurement of a roof s slope expressed as a ratio. Historically roof pitch was designated in two other ways.

A ratio of the ridge height to the width of the building span and as a ratio of the rafter length to the width of the building. Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building. In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. Commonly used roof pitches were given names such as greek.

The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16.