20 Degree Roof Slope

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

20 degree roof slope. Roof pitch on the form x 12 can be expressed in grades as. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

You can find the roof pitch in the form of x 12 like 4 12 or 9 12. A 12 12 pitch roof has a pitch angle of 45. 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. Steeper slopes increase the sail effect that makes them susceptible to wind.

Find the inverse tangent of the pitch to find the angle in degrees. S grade 1 m 2 m 50 slope and roof pitch. Lower slopes don t handle wind driven rain as well. 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. Example slope as grade. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Notes to the table above. Roof pitch is the slope created by the rafter. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. Slope as grade for an elevation of 1 m over a distance of 2 m can be calculated as.

Low slope roofs are from 0 to 3 12 in pitch. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. 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.

Some sources consider low slope to include 3 12 pitch roofs. 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. To convert between american roofing ratios and pitch degrees follow these steps.