How To Figure Square Feet Of A Roof

The calculator cannot account for complex shapes based on a measurement of square footage alone.

How to figure square feet 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. 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 answer is the number of roofing squares for the roof. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.

The total amount of roofing material you need is 17 300 1 730 19 030 square feet. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. 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. 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. 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.