Roof Slope Factor Calculator

Then you ll be able to measure slope from an unfinished attic space under the roof.

Roof slope factor calculator.

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. Here are the equations you may use to solve for the length of the slope and the rafter. Roof pitch calculator results explained. To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page.

You can also calculate roof pitch even without using a roof slope calculator. The pitch of this roof is 4 8 12. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. To obtain an accurate roof pitch measurement properly measure the rise and run.

Use the following formula which also describes a right triangle. 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. All you need is a simple trigonometry equation and a calculator that has a square root button. 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.

Outside of the u s a degree angle is typically used. The roof pitch factor is also used to calculate the length of common rafters. The calculator above can handle much of this math. The maths behind this number is that it is the square root of rise run 2 1.

A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. Angle the angle of a roof is the same as the roof s slope except instead of being. A speed square and level can be used to easily find the pitch of a roof. In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by.

Rafter rise run this formula is from the pythagorean theorem. Calculating the roof slope factor is not that difficult. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.

Measure with a speed square. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. 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.