12 Degree Roof Pitch

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.

12 degree roof pitch.

Find the inverse tangent of the pitch to find the angle in degrees. Roof pitch calculator results explained. Lower slopes don t handle wind driven rain as well. Steeper slopes increase the sail effect that makes them susceptible to wind.

Definitions vary on when a roof is considered pitched. What degree angle is a 12 12 pitch roof. 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.

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. In degrees 10 2 in 12 or 1 in 6 is considered a minimum. The exact roof slope in degrees is given by the arctangent.

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. 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 following are important details to better understand this conversion. Angle the angle of a roof is the same as the roof s slope except instead of being.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. A 12 12 pitch roof has a pitch angle of 45. Divide the first part of the ratio by 12 to work out the pitch. 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.

But how are going to determine the angle s degree. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow.

Thus pitch is typically greater in areas of high rain or snowfall. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.