How To Find Roof Square Footage

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.

How to find roof square footage.

You will need to express this size in terms of square feet. Then take the product of these two dimensions and multiply it by your pitch multiplier. 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. First multiply the length by the width.

Calculate each plane separately. 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. Once you have your roof s pitch divide the number by 12. 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.

Multiply the length and width of each square or rectangle shaped plane. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. 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. Multiply the area by the pitch multiplier to get the roof s square footage.

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. The number you get will be an accurate estimate of how much area you have to cover for your roofing project. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Multiply by the square footage of a single floor of your house.

Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3 to 1 42 for a high pitch roof to get the square roof area. Include dormers the small outjuttings over attic. The calculator cannot account for complex shapes based on a measurement of square footage alone. For example if your roof s pitch is 4 in 12 you would divide 4 by 12.

Cecil venturella march 3. Measure the length and width of every roof plane or surface. How to calculate square feet of a roof step 1.