Roof Area Multiplier

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

Roof area multiplier.

Determine how many square feet of roof area a building has by measuring from the ground. For example a 4 12 pitch roof that is 100 square feet. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Now you re ready to price out the materials.

That gives you 5 590 square feet which is the actual area of the surface of the roof. Or just enter your numbers into this roof pitch degrees. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The maths behind this number is that it is the square root of rise run 2 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. Given pitch and a horizontal area measurement multiply the horizontal area by a correction factor corresponding to pitch provided in the table below to determine the actual area of the roof to be used in the roofing material calculator. The roof pitch multiplier is a number that allows you to find the total surface area of your roof. The pitch of the roof is the rise over a 12 inch run.

And that s the number you were looking for. And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area. Simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. The roof pitch multiplier is responsible for giving an accurate pitch measurement 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. To accurately calculate the area of your roof you must first determine its slope or pitch.

This roof pitch chart will give you your multiplier. 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. Use our roof pitch calculator to find the pitch of your roof. Determine how many square feet of roof area a building has by measuring blueprints or plans.