Calculating Square Footage Of A Pitched 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.

Calculating square footage of a pitched roof.

See the image below for more explanation on rise run and pitch. A 12 in 12 pitch is a steep 45 degree angle roof. 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. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

How do you calculate square footage for a roof. Once you have your roof s pitch divide the number by 12. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Convert the area to roofing squares.

To accurately calculate the area of your roof you must first determine its slope or pitch. 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. Multiply by the square footage of a single floor of your house. 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.

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. Multiply the length by the width to arrive at. This would yield 1 3.