20 Degree Slope Roof

To do this simply convert the rise and run as a fraction to a decimal form eg.

20 degree slope roof.

Rise run rise run slope. Drag sliders to animate the results and diagram. To convert between american roofing ratios and pitch degrees follow these steps. In some very steep roofs you may see the gradient inverted so that the run varies but the rise is held as 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. Let s suppose we are entering a grade that was computed by rise over slope length. What degree angle is a 12 12 pitch roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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

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. Find the inverse tangent of the pitch to find the angle in degrees. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Enter 2 44992 and reading the second output line we see this yields a 1 in 40 ratio and a 1 4321 degree angle.

The graph towards the top of the page shows a small range of angles from zero to 20 degrees. Low slope roofs have gradients of 3 12 or less. 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. Divide the first part of the ratio by 12 to work out the pitch.

Roof slopes are identified using the gradient method described above where the rise varies but the run is usually 12. The triangle diagram will be re drawn to scale with all dimensions marked. First convert the pitch to a slope. 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.

This chart covers a wider range. 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.