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Frederick Roof Repair

Serving Frederick and Montgomery County, MD
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A Roofer’s Square

The use of the term “square” by roofers is not about squareness as you usually think of it.

This image is a 10 by 10 square

This shape is a square

A triangle which is a square

And this shape is a square

a parallelogram that is a square

This shape is a square too

A rectangle that is a square

So is this one

Roofers Are Not Bad Shape Identifiers

So what gives? Basically, a roofer’s use of the term “square” means any area that represents 100 square feet. As a result, any shape that covers this area is considered a square by a roofer. Notice that I did not say all the above shapes were “squares”. This would be of course wrong, and I would need to go back to pre-k. I also did not make the mistake of telling you that a roofer’s square is a 10’x10′ area. This mistake is often made. Of course, a 10’x10′ area is a square, but so is an isosceles triangle ( a triangle with two equal sides and two equal angles) with a base of 20′ and a height of 10′, a parallelogram in which adjacent sides multiplied equal 100 and opposite sides are parallel, and a rectangle in which adjacent sides multiplied equal 100.

Summarized, a roofer’s use of the term square has little to do with shape and everything to do with surface area being equal to 100 square feet. A circle can even be a “square” according to this use of the term.

As an aside, roofing shingle manufacturers have what they like to refer to as a “field square”. To learn more about this designation, click here.

Thanks for reading.

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