HOW TO MEASURE A ROOF
You Need Some Simple Geometry
There are many ways in which to measure a roof. This section will show one method of how to properly do it. The final answer we will be expressed in “squares”.
Roofers express Area in “squares” for most all roofing applications.
1 square = 100 square feet
The base length (b) times the height (h) of any triangle is twice its area (A). So if you divide the product of the base and height by two, then you have the area of a triangle.
(b×h)/2 = Area
Therefore, the following two triangles, R and H, though different in looks and shape, have the exact same area.
(20′ × 20′)/2 = 200 square feet
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