Formula For Figuring Square Footage Of A Roof

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

Formula for figuring square footage of a roof.

However this is a must if you re installing a new roof. If you re just replacing some old shingles you may not need to purchase underlayment. 1 300 x 1 05 1 365 square feet calculating the area true if you want to get the exact area measurement for your roof you can follow these steps. Calculate each plane separately.

Multiply the length and width of each square or rectangle shaped plane. 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. This is simply 100 square feet of roof. Free online roof shingles sheet area calculator.

Measure the length and width of every roof plane or surface. This would yield 1 3 next square your result. Include dormers the small outjuttings over attic. Calculate the square footage area of a hip roof.

Calculation of roofing square feet is made easier. The answer is the number of roofing squares for the roof. A square simply refers to a 10 x 10 square of roofing. Once you have your roof s pitch divide the number by 12.

For instance if the roof is 1550 square feet then it is 16 squares. The top ridge will be shorter than the one of the gable roof but the four hips will add. Square feet of roof sqrt pitch 2 144 12 squares of roof square feet of roof span length 144 llratio is squares of roof 100. Where span pitch length span pitch and length of the roof shingles respectively.

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. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. How to calculate square feet of a roof step 1. Estimate the pitch of the roof.

A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. However shingles are packaged in a way that they are light enough for the average person to carry around. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. Find the square footage of the roof.

As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles. Multiply this number by your most recent result to get the estimated square footage of your roof. The calculator cannot account for complex shapes based on a measurement of square footage alone. Measure the length and width of each portion of the roof multiply length by width for each plane and add the planes together for the total square footage.