# Typical Roof Pitch Angles

By Evony Maurice. Roof Pitch. Published at Wednesday, February 27th, 2019 - 13:58:20 PM.

The slope can be expressed numerically as a ratio. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example, a “4 in 12” slope can be expressed as the ratio of 4:12. A “6 in 12” slope is expressed as 6:12.

That measurement is the number of inches that the roof rises in 12 inches. Measuring the roof slope from the roof surface will be inaccurate without the use of something to make a flat surface from which to measure the slope. The use of a 48-inch carpenter’s level or a straight 2×4 board may be useful to create a smooth surface that mirrors the slope of the roof.

Measuring the slope from the roof surface may not produce the most accurate measurement because of the inherently uneven surface of the roof covering. Locate a roof rafter board that is readily accessible to you. Place the end of the level against the bottom edge of a roof rafter and hold it perfectly level.

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