How To Work Out The Slope Of A Roof

The standard pitch of most residential roofs ranges between 4 in 12 and 9 in 12.

How to work out the slope of a roof.

Use a level against the underside of the rafter you re measuring to get the most accurate value. Access one of the rafters then take the measurement this way. Locate the level s 12 inch mark. Pitch rise run 1 5 6 25.

For example if your roof rises 7 inches for every 12 inches of horizontal run then your roof has a 7 in 12 pitch. This theorem is done by multiplying the square s square root by the sum of the squared width and the squared height. The most precise way to find the roof s slope is by measuring it from the underside. Recalculate this value into an angle.

Formula for calculating the slope the length of a slope is calculated using the pythagorean theorem. The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run. Finally you can find the roof pitch in the form of x 12. Calculating roof slope is done by calculating the number of inches your roof slope rises vertically for every 12 inches it extends horizontally.

Calculate the roof pitch as the proportion of rise and run. To do this you will need to write down the measurements that you have taken from the rafters. The horizontal distance in the ratio will be 12 while the vertical distance is the measurement you took from the rafters.