Common Roof Pitch Angles Used By Builders

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.

Common roof pitch angles used by builders.

The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16. Roof pitch defined and explained. Roof pitch designations are comprised of two numbers indicating a ratio. Or the colon can replace the slash as in 2 12 or 7 12.

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. Historically roof pitch was designated in two other ways. Commonly used roof pitches were given names such as greek. Pitch angle incline slope they all can be used to refer to the steepness of a roof.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.