Calculate roof pitch and rise1/25/2024 In the imperial measurement systems, "pitch" is usually expressed with the rise first and run second (in the US, 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. A flat roof has a pitch of zero in either instance all other roofs are pitched.Ī roof that rises 3 inches per foot, for example, would be described as having a pitch of 3 (or “3 in 12”). Roof pitch is the steepness of a roof expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. Measure of roof steepness Display of roof pitches 1/12 through 18/12 A roof made of thatch, one of the oldest roofing materials, needs a steep pitch to drain properly Some types of stone roof have a very restrictive roof pitch, which can lead to leaking Working on roofs with pitches too steep for safety requires a staging of scaffolding boards secured with roof brackets
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