How Do You Figure Out Square Footage Of A Roof

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

How do you figure out square footage of a roof.

If you measured in feet skip to calculate the area as square footage. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. If the house has an irregular shape measure each part separately figure the separate areas and add them together. Calculate or enter the square footage of the attic or area to be vented.

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 by the width to arrive at the ground area of the house. However shingles are packaged in a way that they are light enough for the average person to carry around. If you measured in feet inches divide inches by 12 and add that to your feet measure to get total feet.

To find the squares divide the overall roof area by 100 and then round up. Divide by 12 and that is your measurement in feet. 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. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.

If you measured in another unit of measure do the following to convert to feet. 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. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.

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. Calculate the square footage of a gambrel style roof using imperial measurements. For instance if the roof is 1550 square feet then it is 16 squares. As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.

The calculator cannot account for complex shapes based on a measurement of square footage alone.