Roof Math Formula

Roofers have to use it when constructing a frame for a new roof or when repairing a frame.

Roof math formula.

You can also calculate roof pitch even without using a roof slope calculator. The key is to be as accurate as possible since falling short or an overage could mean thousands of dollars when planning your roofing budget. Slope measures the angle of change in elevation which can be obtained by dividing rise by run and multiply the result with 100. In particular roofers have to use geometry to determine the length and the angle to which to cut the rafters.

To figure out your roof s area a simple geometry can be used. Length of rafter suppose a roof has a rise of 18 inches and a run of 15 feet. The maths behind this number is that it is the square root of rise run 2 1. They have to do this with a formula that takes into account the rise of the roof the vertical height and the run the horizontal length.

Roofing is measured in squares. Rafter rise run this formula is from the pythagorean theorem. Roof slope is also called as roof pitch. Below there is a simple triangle and the math used to work out.

A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. In civil engineering the slope is the numerical measure of the steepness of a roof. Use the following formula which also describes a right triangle. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span.

If a plan calls for a 6 12 pitch roof then the architect wants the slope of the roof to go up six inches for every 12 inches of horizontal run. Here are the equations you may use to solve for the length of the slope and the rafter.