Pitch Of A Roof Angle

Roof pitch degree table.

Pitch of a roof angle.

There is no standard universal roof pitch. Commonly used roof pitches were given names such as greek. Roof pitch refers to the slope which the rafter creates. 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.

Roof pitch varies depending on culture climate style and available materials. Contemporary houses often have flat roofs which shouldn t be completely flat but should be around 1 40. Most roof s have a pitch in the 4 12 to 9 12 range. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. In the usa the range of standard pitches is anywhere between 4 12 and 9 12. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. In the uk the typical house has a pitch between 40 50 although 45 should be avoided.

Historically roof pitch was designated in two other ways.