15 Degree Roof Slope

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

15 degree roof slope.

Lower slopes don t handle wind driven rain as well. A 12 12 pitch roof has a pitch angle of 45. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Divide the first part of the ratio by 12 to work out the pitch.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. To convert between american roofing ratios and pitch degrees follow these steps. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily.

With the use of this converter it will be easier for you to locate a 30 degree roof pitch 20 degree roof pitch 25 degree roof pitch or a 15 degree roof pitch. 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. But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. Steeper slopes increase the sail effect that makes them susceptible to wind.

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. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. 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. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

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.