How To Estimate The Square Footage Of A Roof

Roofing material is estimated by the square which is equal to 100 square feet.

How to estimate the square footage of a roof.

So you re thinking of reroofing the house yourself and want an estimate for how much roofing material you. Multiply the square footage of your roof by 1 to get the 10 percent waste allowance. 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. 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.

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. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square.

The average roof is 3 000 square feet or around 30 squares. The first step in a free roofing estimate is measuring the roof dimensions. Estimate the pitch of the roof. The answer is the number of roofing squares for the roof.

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. You will need to express this size in terms of square feet. Many homes have an asphalt shingle roof but some have wood metal tile and slate which can be more expensive.

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. 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.