How To Measure Roof Square Footage

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.

How to measure roof square footage.

Convert the area to roofing squares. Measure the ground dimensions of the house using a tape measure and write down these dimensions. If your roof measures 48 feet 15 m x 24 feet 7 3 m multiplying its length by its width would give you a square footage of 1 152 square feet 107 0 m 2. If you use ground measurements to determine your roof squares you will need to also compensate roof overhang and slopes to get an accurate count.

To convert the square footage to roof squares divide the square footage by 100. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. 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. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

The roof surface area would be 24. Outside of the u s a degree angle is typically used. If its pitch is 6 in 12 a pitch multiplier of 1 12 multiplying 1 152 sq ft 107 0 m 2 by 1 12 would give you an overall square footage of 1 290 square feet 120 m 2. Multiply the length by the width to arrive at.

Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Use the instructions for obtaining roof slope to add to your ground measurements.