Pitch Of A Roof Angle

Common roof pitches and equivalent grade degree and radian angles.

Pitch of a roof angle.

There is no standard universal roof pitch. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Historically roof pitch was designated in two other ways. In the uk the typical house has a pitch between 40 50 although 45 should be avoided.

Most roof s have a pitch in the 4 12 to 9 12 range. Contemporary houses often have flat roofs which shouldn t be completely flat but should be around 1 40. Roof pitch degree table. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

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. In the usa the range of standard pitches is anywhere between 4 12 and 9 12. Commonly used roof pitches were given names such as greek. Roof pitch slope roof angle degree 1 12 pitch.

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