12 Degree Roof Pitch

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

12 degree roof pitch.

Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. To convert between american roofing ratios and pitch degrees follow these steps. The following are important details to better understand this conversion.

Thus pitch is typically greater in areas of high rain or snowfall. Divide the first part of the ratio by 12 to work out the pitch. 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.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Also roof pitch angle is sometimes referred to as 12 12 6 12 8 12 and so forth. 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. 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.

Definitions vary on when a roof is considered pitched. 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 12 12 pitch roof has a pitch angle of 45. A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. But how are going to determine the angle s degree. Angle the angle of a roof is the same as the roof s slope except instead of being. In degrees 10 2 in 12 or 1 in 6 is considered a minimum.

Most roof s have a pitch in the 4 12 to 9 12 range. The exact roof slope in degrees is given by the arctangent. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Find the inverse tangent of the pitch to find the angle in degrees. Lower slopes don t handle wind driven rain as well. 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.