20 Degree Slope Roof

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.

20 degree slope roof.

Find the inverse tangent of the pitch to find the angle in degrees. 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. Drag sliders to animate the results and diagram. 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.

To do this simply convert the rise and run as a fraction to a decimal form eg. Divide the first part of the ratio by 12 to work out the pitch. A 12 12 pitch roof has a pitch angle of 45. The graph towards the top of the page shows a small range of angles from zero to 20 degrees.

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

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. 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.

Roof slopes are identified using the gradient method described above where the rise varies but the run is usually 12. In some very steep roofs you may see the gradient inverted so that the run varies but the rise is held as 12. What degree angle is a 12 12 pitch roof. Low slope roofs have gradients of 3 12 or less.

This chart covers a wider range. For a pitch expressed in inches per foot convert to a fraction. Rise run rise run slope. 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.

Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.