20 Degree Roof Slope

Low slope roofs are from 0 to 3 12 in pitch.

20 degree roof slope.

A 12 12 pitch roof has a pitch angle of 45. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. To convert between american roofing ratios and pitch degrees follow these steps. What degree angle is a 12 12 pitch roof.

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. Divide the first part of the ratio by 12 to work out the pitch. Some sources consider low slope to include 3 12 pitch roofs. Example slope as grade.

A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. 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. 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. Roof pitch on the form x 12 can be expressed in grades as.

Notes to the table above. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. 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. Steeper slopes increase the sail effect that makes them susceptible to wind.

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. However you can only use this pitch with built up roofing or specialized synthetic roofing. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

You can find the roof pitch in the form of x 12 like 4 12 or 9 12. Lower slopes don t handle wind driven rain as well. Roof pitch is the slope created by the rafter.