Roof Square Footage Formula

You will need to express this size in terms of square feet.

Roof square footage formula. 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. Multiply this number by your most recent result to get the estimated square footage of your roof. Once you have your roof s pitch divide the number by 12. For example take an area made up of a triangle that s 20 feet high and has a base of 40 feet plus a square that s 40 feet by 40 feet.

2 000 100 20. 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. The calculator cannot account for complex shapes based on a measurement of square footage alone. Feet then you will have 20 squares.

As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles. 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 would yield 1 3 next square your result. This is pretty simple.

Multiply by the square footage of a single floor of your house. If your roof is 2 000 sq. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. The square footage of a hip roof area is identical to the square footage of a gable roof of the same size.

Convert the area to roofing squares. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. Roofing square conversion calculator now it s time to convert square feet into roofing squares. However shingles are packaged in a way that they are light enough for the average person to carry around.

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. The answer is the number of roofing squares for the roof. The top ridge will be shorter than the one of the gable roof but the four hips will add to the ridge length. Divide any irregularly shaped areas of the roof into more manageable triangles and rectangles then calculate square footage for those individual elements and add them to get the total square footage.

For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.