Roof-multi-plier, 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. the roof pitch multiplier is determined by finding the square root of ((rise/run)² + 1). (divide the rise by the run.. The roof pitch multiplier is a number that allows you to find the total surface area of your roof. simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself. this is useful since the area of the roof itself is often difficult to measure by hand!, the roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof. this makes measuring easier, knowing that you are able to get the exact measurement of roofs by merely standing on the ground..

And for a roof with a slope of 6 : 12, that number, 1.118, is your roof slope multiplier. take the area of the roof’s footprint, say it's 5,000 square feet, and multiply 5,000 by 1.118. that gives you 5,590 square feet, which is the actual area of the surface of the roof. and that’s the number you were looking for., to accurately calculate a roof, you will need to measure roof length and width, and already have the roof pitch measurement. once you have all that, multiply the roof length by roof width, and then, multiply the result by a pitch multiplier. for example, we have a roof which measures 56 x 29 feet, and has a roof pitch of 8. here is the math:.

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