The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.

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Original Article Source Credits:    This Old House , https://www.thisoldhouse.com/

Article Written By:  Joseph Truini

Original Article Posted on:  NA

Link to Original Article:  https://www.thisoldhouse.com/roofing/21015547/determining-roof-pitch