How steep a roof is — measured as inches of rise per 12 inches of horizontal distance, like 4:12 or 6:12.
The slope or steepness of a roof, expressed as the ratio of rise to run — the number of inches of vertical rise per 12 inches of horizontal run. A 4:12 pitch rises 4 inches for every 12 inches of horizontal distance. Pitch affects water drainage speed, snow accumulation, material selection, and worker safety. Low-slope roofing typically refers to pitches of 3:12 or less.
The architect specified a 6:12 pitch to balance ceiling height in the bedroom, adequate drainage, and a design that matched the neighborhood character.
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