How To Estimate Roofing Squares

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

How to estimate roofing squares.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. 1 roof square 100 square feet.

To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in 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. So if you divide your answer of a product of length times height by two you will get the area of a triangle. For instance if the roof is 1550 square feet then it is 16 squares.

Although roofing projects are estimated and sold by the square roofing material is often not sold in 1 square increments. To find the squares divide the overall roof area by 100 and then round up. It is often compared to slope but is not exactly the same. Outside of the u s a degree angle is typically used.

This is simply 100 square feet of roof. Then add 10 to the number to account for waste. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. A square simply refers to a 10 x 10 square of roofing.

The answer is the number of roofing squares for the roof. The length l times the height h of a triangle is twice its area a2. Convert the area to roofing squares.