20 Degree Roof Pitch

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

20 degree roof pitch. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. 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. Divide the first part of the ratio by 12 to work out the pitch. Find the inverse tangent of the pitch to find the angle in degrees.

Steeper slopes increase the sail effect that makes them susceptible to wind. Roof pitch refers to the slope which the rafter creates. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. 8 12 pitch 33 75 degrees.

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. What degree angle is a 12 12 pitch roof. Most roof s have a pitch in the 4 12 to 9 12 range. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily.

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

Lower slopes don t handle wind driven rain as well. 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. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. A 12 12 pitch roof has a pitch angle of 45.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 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. To convert between american roofing ratios and pitch degrees follow these steps. 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.

Roof pitch to degrees equivalents this drawing demonstrates how many degrees rise for each pitch of a typical roof.