15 Degree Roof Slope

Divide the first part of the ratio by 12 to work out the pitch.

15 degree roof slope.

Find the inverse tangent of the pitch to find the angle in degrees. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Lower slopes don t handle wind driven rain as well. A 12 12 pitch roof has a pitch angle of 45.

To convert between american roofing ratios and pitch degrees follow these steps. But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. 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. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. What degree angle is a 12 12 pitch roof.

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. Steeper slopes increase the sail effect that makes them susceptible to wind.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.