Roof Pitch Multiplier

And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier.

Roof pitch multiplier.

The maths behind this number is that it is the square root of rise run 2 1. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. The pitch of this roof is 4 8 12. Based on the pitch you can use the multiplier to determine the amount of material needed for a roofing project.

The calculator above can handle much of this math. The roof pitch multiplier is the length of the hypotenuse divided by the run. A flat roof has a pitch of 1 meaning the material needed is 1 times the size of the roof. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.

A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. So the actual roof surface if it were laid down flat on the ground would be 1 118 times larger than the footprint of the roof. 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. Determine how many square feet of roof area a building has by measuring blueprints or plans.

Roof pitch multiplier c over b. Determine how many square feet of roof area a building has by measuring from the ground. 48 10 4 8. The roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. After safely measuring your roof to discover the pitch you can use the graph below to calculate your roof pitch in degrees and multiplier. The chart gives a number of roof pitch multipliers for different roof slopes. Now divide the rise by the multiplier to get the pitch eg.