How To Find Roof Square Footage

Then take the product of these two dimensions and multiply it by your pitch multiplier.

How to find roof square footage. In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area. Measure the length and width of every roof plane or surface. Multiply the area by the pitch multiplier to get the roof s square footage. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.

Things you will need steel tape measure. The number you get will be an accurate estimate of how much area you have to cover for your roofing project. Include dormers the small outjuttings over attic. Calculate each plane separately.

If your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width. 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. Multiply the length and width of each square or rectangle shaped plane. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure.

This would yield 1 3. You will need to express this size in terms of square feet. Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material. For example if your roof s pitch is 4 in 12 you would divide 4 by 12.

Cecil venturella march 3. How to calculate square feet of a roof step 1. First multiply the length by the width. 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.

Multiply by the square footage of a single floor of your house. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. Once you have your roof s pitch divide the number by 12.