Calculating Square Footage Of A Pitched Roof

Measure the ground dimensions of the house using a tape measure and write down these dimensions.

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. 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. Once you have your roof s pitch divide the number by 12.

Multiply by the square footage of a single floor of your house. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. 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.

Convert the area to roofing squares. This would yield 1 3. To accurately calculate the area of your roof you must first determine its slope or pitch. How do you calculate square footage for a roof.

Because each 100 square feet of roof is one roofing square divide. Multiply the length by the width to arrive at. 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.