1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
How to figure out square footage of a roof.
Multiply the square footage of your roof by 1 to get the 10 percent waste allowance.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Use this information if.
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.
Calculate square footage for a roof by measuring and by performing some basic math equations.
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.
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.
The total amount of roofing material you need is 17 300 1 730 19 030 square feet.