Roof Area Multiplier

The roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof.

Roof area multiplier.

The roof pitch multiplier is a number that allows you to find the total surface area of your roof. This roof pitch chart will give you your multiplier. And that s the number you were looking for. 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.

That gives you 5 590 square feet which is the actual area of the surface of the roof. Use our roof pitch calculator to find the pitch of your roof. To accurately calculate the area of your roof you must first determine its slope or pitch. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

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. 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. Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. 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. Determine how many square feet of roof area a building has by measuring from the ground. This is useful since the area of the roof itself is often difficult to measure by hand. 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. Depending whether the roof area is measured horizontally possibly from a drawing or photograph a correction factor is necessary to determine the actual area of the roof. Simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself. Or just enter your numbers into this roof pitch degrees.

And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. For example a 4 12 pitch roof that is 100 square feet. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. The pitch of the roof is the rise over a 12 inch run.