20 Degree Slope Roof

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.

20 degree slope roof.

Low slope roofs have gradients of 3 12 or less. Rise run rise run slope. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. To do this simply convert the rise and run as a fraction to a decimal form eg.

A 12 12 pitch roof has a pitch angle of 45. 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. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. To convert between american roofing ratios and pitch degrees follow these steps.

The triangle diagram will be re drawn to scale with all dimensions marked. This chart covers a wider range. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. What degree angle is a 12 12 pitch roof.

The graph towards the top of the page shows a small range of angles from zero to 20 degrees. Enter 2 44992 and reading the second output line we see this yields a 1 in 40 ratio and a 1 4321 degree angle. In some very steep roofs you may see the gradient inverted so that the run varies but the rise is held as 12. First convert the pitch to a slope.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. 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. Let s suppose we are entering a grade that was computed by rise over slope length.

Find the inverse tangent of the pitch to find the angle in degrees. Roof slopes are identified using the gradient method described above where the rise varies but the run is usually 12. Drag sliders to animate the results and diagram. 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 find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. However if you to do the process using your own knowledge you can still convert pitch to degrees by dividing the rise and run and get its corresponding measurement.