Calculating Square Footage Of A Pitched Roof

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Calculating square footage of a pitched roof.

To accurately calculate the area of your roof you must first determine its slope or pitch. See the image below for more explanation on rise run and pitch. Multiply the length by the width to arrive at. If you don t want to do a lot of measuring you can use your pitch calculation to get an estimated square footage of your roof.

So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having. A 12 in 12 pitch is a steep 45 degree angle roof. Because each 100 square feet of roof is one roofing square divide. Divide any irregularly shaped areas of the roof into more manageable triangles and rectangles then calculate square footage for those individual elements and add them to get the total square footage.

Convert the area to roofing squares. 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. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Once you have your roof s pitch divide the number by 12.

How do you calculate square footage for a roof. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. For example take an area made up of a triangle that s 20 feet high and has a base of 40 feet plus a square that s 40 feet by 40 feet.