Formula For Roofing Area

Calculating the area true once you have your roof s pitch divide the number by 12.

Formula for roofing area. If your number is 1 3 squared would yield 1 9 after that add 1 to your number. Next square your result. Roof pitch is given as the number of inches in height change over the distance of one foot. In the construction industry roofs are measured in squares one square equals 100 square feet.

The answer to this is the total number of squares on your roof for which you need to purchase shingles. The length l times the height h of a triangle is twice its area a2. Dividing by 12 gives the ratio of inches in rise per distance. Divide the area you calculated in step 4 by 100.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. 1 9 1.