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Tips on Measuring for Roofing
To accurately calculate the area of your roof, you must first determine its slope, or pitch. Roof pitches are described in terms of rise and run.
The run is the distance from the outside edge of a perimeter stud wall to the center of the house. The rise is the distance from the top of a
stud wall to the peak of the roof. A roof's pitch is determined by how much it rises for every foot it runs. Thus, a moderate 6 in 12 roof pitch
means the roof rises 6 inches for every 12 horizontal inches it runs. A 12 in 12 pitch is a steep, 45-degree angle roof.
Use one of these three methods to calculate your roof's pitch. You'll need a level and a tape measure or ruler. Mark a spot on the bottom of the
level, 12 inches from one end.
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 -
round to the nearest foot.
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