20 Degree Roof Pitch

Roof pitch refers to the slope which the rafter creates.

20 degree roof pitch.

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. 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. Common roof pitches and equivalent grade degree and radian angles. To see roof pitch visual examples how to determine pitch.

But with the use of a roof pitch in degrees converter you will be able to get the correct measurement. 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. 8 12 pitch 33 75 degrees. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

To convert between american roofing ratios and pitch degrees follow these steps. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Roof pitch to degrees equivalents this drawing demonstrates how many degrees rise for each pitch of a typical roof. Steeper slopes increase the sail effect that makes them susceptible to wind. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily.

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. Find the inverse tangent of the pitch to find the angle in degrees. What degree angle is a 12 12 pitch roof. A 12 12 pitch roof has a pitch angle of 45.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Divide the first part of the ratio by 12 to work out the pitch. Lower slopes don t handle wind driven rain as well. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5.

Look at the column labeled pitch then look under degrees to get the corresponding amount of degrees.