In metric systems either the angle in degrees or rise per unit of run, expressed as a '1 in _' slope (where a '1 in 1' equals 45°) is used. ![]() In the imperial measurement systems, "pitch" is usually expressed with the rise first and run second (in the USA, run is held to number 12 e.g., 3:12, 4:12, 5:12). The pitch of a roof is its vertical 'rise' over its horizontal 'run’ (i.e.
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