Pitch Of A Roof Angle

Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

Pitch of a roof angle.

There is no standard universal roof pitch. Roof pitch varies depending on culture climate style and available materials. Common roof pitches and equivalent grade degree and radian angles. Most roof s have a pitch in the 4 12 to 9 12 range.

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. 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. 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. Historically roof pitch was designated in two other ways.

In the usa the range of standard pitches is anywhere between 4 12 and 9 12. In the uk the typical house has a pitch between 40 50 although 45 should be avoided. Commonly used roof pitches were given names such as greek. Roof pitch degree table.

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