How To Figure Square Feet Of A Roof

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 figure square feet of a roof.

1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. The calculator cannot account for complex shapes based on a measurement of square footage alone. 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. 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. 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. If your roof measures 48 feet 15 m x 24 feet 7 3 m multiplying its length by its width would give you a square footage of 1 152 square feet 107 0 m 2. 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. 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.