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Calculating rise over run for roof11/9/2023 ![]() For example, if you measured 7 inches, the roof’s ratio will be 7:12. The number you measured with the tape is the roof’s rise - the amount the roof’s height rises over 12 horizontal inches. If you decide to measure from the level down, you must add the length of the tape measure unit itself into the measurement. It is much easier to put the end of the tape on the roof and hold your hand up. Make sure you rotate the tape so it is perpendicular to the level. Hold the level parallel to the ground and measure the distance from the roof’s surface to the level’s 12-inch mark.
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