Formula For Figuring Square Footage Of A Roof

The top ridge will be shorter than the one of the gable roof but the four hips will add.

Formula for figuring square footage of a roof.

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. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. Include dormers the small outjuttings over attic. Calculate each plane separately.

The square footage of a hip roof area is identical to the square footage of a gable roof of the same size. 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 only difference in this calculation to the one for a gable roof area is the amount of the ridge. Calculate the square footage area of a hip roof.

Measure the length and width of every roof plane or surface. 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. A square simply refers to a 10 x 10 square of roofing. If you re just replacing some old shingles you may not need to purchase underlayment.

Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. 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. Multiply the length and width of each square or rectangle shaped plane. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.

However this is a must if you re installing a new roof. Where span pitch length span pitch and length of the roof shingles respectively. The answer is the number of roofing squares for the roof. This would yield 1 3 next square your result.

The calculator cannot account for complex shapes based on a measurement of square footage alone. Estimate the pitch of the roof. Free online roof shingles sheet area calculator. Once you have your roof s pitch divide the number by 12.

However shingles are packaged in a way that they are light enough for the average person to carry around. Calculation of roofing square feet is made easier. This is simply 100 square feet of roof. To find the squares divide the overall roof area by 100 and then round up.

For instance if the roof is 1550 square feet then it is 16 squares. Multiply this number by your most recent result to get the estimated square footage of your roof. 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. Find the square footage of the roof.