How To Figure Square Feet Of A Roof

1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.

How to figure square feet of a 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. 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. If its pitch is 6 in 12 a pitch multiplier of 1 12 multiplying 1 152 sq ft 107 0 m 2 by 1 12 would give you an overall square footage of 1 290 square feet 120 m 2.

The calculator cannot account for complex shapes based on a measurement of square footage alone. Multiply the square footage of your roof by 1 to get the 10 percent waste allowance. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. Convert the area to roofing squares.

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. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.