Measure Slope Of Roof

For example if you find 4 inches of height with the tape measure at the 12 inch mark on the level your slope is 4 12 or 4 in 12.

Measure slope of roof.

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Conventional slope roof range between 4 in 12 and 8 in 12. Roof slope style. The run always remains constant at 12 inches.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Rise run pitch where pitch is expressed in percent. You can use the following equations to find the length of the rafter and the slope. Locate the level s 12 inch mark.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. It is often compared to slope but is not exactly the same. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.

Use a level against the underside of the rafter you re measuring to get the most accurate value. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. There are two main categories of roofing. Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.

Rafter rise run from the pythagorean theorem. Access one of the rafters then take. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Just write down the measurements you found.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. 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. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. There s no need to simplify them.

How to calculate roof pitch. How do you calculate the slope of a roof. A flat roof has a slope of 2 in 12 or less. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. That is the roof s rise. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. The next step is to measure the pitch also referred to as the roof slope of the roof deck.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run.