How To Figure Square Footage Of A Roof

Calculate square footage for a roof by measuring and by performing some basic math equations.

How to figure square footage of a roof.

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. With the area measurement you can learn the approximate cost of a new roof. To conclude the example if your total roofing area is 17 300 square feet your waste allowance would be 17 300 x 1 1 730 square feet. The total amount of roofing material you need is 17 300 1 730 19 030 square feet.

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. 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. How to calculate the roof area using the building square footage the pitch of the roof.

Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Multiply the square footage of your roof by 1 to get the 10 percent waste allowance.