12 Degree Roof Pitch

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

12 degree roof pitch. Definitions vary on when a roof is considered pitched. The exact roof slope in degrees is given by the arctangent. A 12 12 pitch roof has a pitch angle of 45. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind.

Roof pitch calculator results explained. 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. Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Thus pitch is typically greater in areas of high rain or snowfall.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Find the inverse tangent of the pitch to find the angle in degrees. 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 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. 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. 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.

To convert between american roofing ratios and pitch degrees follow these steps. What degree angle is a 12 12 pitch roof. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. 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.

Lower slopes don t handle wind driven rain as well. Steeper slopes increase the sail effect that makes them susceptible to wind. Angle the angle of a roof is the same as the roof s slope except instead of being. 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 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. The following are important details to better understand this conversion.