How To Estimate The Square Footage Of A Roof

Estimate the pitch of the roof.

How to estimate the square footage of a roof.

The first step in a free roofing estimate is measuring the roof dimensions. 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. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square. So you re thinking of reroofing the house yourself and want an estimate for how much roofing material you.

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 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 total amount of roofing material you need is 17 300 1 730 19 030 square feet. Roofing material is estimated by the square which is equal to 100 square feet.

Many homes have an asphalt shingle roof but some have wood metal tile and slate which can be more expensive. 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. The answer is the number of roofing squares for the roof.

The average roof is 3 000 square feet or around 30 squares. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. 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. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.

The calculator cannot account for complex shapes based on a measurement of square footage alone. How to calculate the roof area using the building square footage the pitch of the roof.