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ASK AN EXPERT: Roof Pitch Vs. Roof Slope



Q: What's the difference between roof pitch and roof slope?


While both roof pitch and roof slope describe the inclination of a roof, they use different methods of expression:


Roof Pitch

  • Expressed as a ratio of the vertical rise to the horizontal run (half the span).

  • Commonly written as "X/12," where X is the number of inches the roof rises for every 12 inches of horizontal run.

  • Example: A 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal run.


Roof Slope

  • Expressed as a percentage.

  • Calculated by dividing the vertical rise by the horizontal run and multiplying by 100.

  • Example: A roof with a 6/12 pitch has a slope of 50% (6/12 * 100 = 50).

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