Roof Slope Factor Calculator

Measure with a speed square.

Roof slope factor calculator.

The maths behind this number is that it is the square root of rise run 2 1. If you need to find out the area of the roof such as to purchase roofing knowing and using the factor will assist you greatly in determining the exact square footage. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. To obtain an accurate roof pitch measurement properly measure the rise and run.

In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by. Then you ll be able to measure slope from an unfinished attic space under the roof. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. The pitch of this roof is 4 8 12.

Here are the equations you may use to solve for the length of the slope and the rafter. A speed square and level can be used to easily find the pitch of a roof. Calculating the roof slope factor is not that difficult. The roof pitch factor is also used to calculate the length of common rafters.

A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. 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 this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. 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. Angle the angle of a roof is the same as the roof s slope except instead of being.

Rafter rise run this formula is from the pythagorean theorem. To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq. You can also calculate roof pitch even without using a roof slope calculator.

The calculator above can handle much of this math. Use the following formula which also describes a right triangle. Outside of the u s a degree angle is typically used. All you need is a simple trigonometry equation and a calculator that has a square root button.

The slope of the roof provides the rise and the run to be plugged into the equation. Feet the area of a hip roof equals the area of a gable roof with the same dimensions. Set the level on the edge of the speed square as shown below then place the heel of the speed square on a rafter or gable edge of the roof.