Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Figure squares for roof.
The answer is the number of roofing squares for the roof.
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.
Shingles and other roofing materials such as underlayment are typically measured in squares that are 10 feet long and 10 feet wide with each square measuring 100 square feet.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
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.
The calculator cannot account for complex shapes based on a measurement of square footage alone.
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.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.