20 Degree Roof Slope

However you can only use this pitch with built up roofing or specialized synthetic roofing.

20 degree roof slope.

A 12 12 pitch roof has a pitch angle of 45. Find the inverse tangent of the pitch to find the angle in degrees. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. Roof pitch on the form x 12 can be expressed in grades as.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. 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. Notes to the table above.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Example slope as grade. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. Roof pitch is the slope created by the rafter.

To convert between american roofing ratios and pitch degrees follow these steps. 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. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Divide the first part of the ratio by 12 to work out the pitch.

A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. Some sources consider low slope to include 3 12 pitch roofs. 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. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. You can find the roof pitch in the form of x 12 like 4 12 or 9 12. Low slope roofs are from 0 to 3 12 in pitch.

But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. 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.