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To pitch of roof, place a one foot level on the roof with one side touching, and the other side in the air (leveled) from the side in the air, measure down in inches. If you measure 5 inches, then your roof has a 5/12 pitch; meaning it rises five feet of height in every twelve feet of run.

Using this number and a little math you can figure the height of roof ridge, measure total width, divide by two to find one half. If your roof pitch was 5/12 and you measured the half measurement to center of 14 feet, then your height to the ridge (off the top of end wall of house) is 5.83 feet.

This number is found by dividing your pitch numbers; 5 divided by 12, and then multiply that number by 14.

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Q: How do you determine the height of a roof ridge?
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