How To Work Out The Slope Of A Roof

Formula for calculating the slope the length of a slope is calculated using the pythagorean theorem.

How to work out the slope of a roof.

Square root width x width height x height slope length. The standard pitch of most residential roofs ranges between 4 in 12 and 9 in 12. Pitch rise run 1 5 6 25. Access one of the rafters then take the measurement this way.

The horizontal distance in the ratio will be 12 while the vertical distance is the measurement you took from the rafters. The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run. The most precise way to find the roof s slope is by measuring it from the underside. Finally you can find the roof pitch in the form of x 12.

Use a level against the underside of the rafter you re measuring to get the most accurate value. Calculating roof slope is done by calculating the number of inches your roof slope rises vertically for every 12 inches it extends horizontally. Locate the level s 12 inch mark. Calculate the roof pitch as the proportion of rise and run.

This theorem is done by multiplying the square s square root by the sum of the squared width and the squared height. Recalculate this value into an angle. To do this you will need to write down the measurements that you have taken from the rafters.