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News & Advice

What Is The Steepest Pitch Allowed On A Roof?

What Is The Steepest Pitch Allowed On A Roof?

The steepest pitch allowed on a roof varies by local building codes, but pitches can go as steep as 18/12.

Guidelines For Roof Pitch Restrictions

  1. Local Building Codes – Building codes specify the minimum and maximum allowable roof pitches for different types of roofs and building structures. These codes are typically determined by local building authorities to ensure structural integrity, safety, and adherence to zoning regulations.
  2. Residential vs. Commercial Structures – Large structures need more open space, while commercial buildings have stricter limitations due to architecture and function. Climate affects roof pitch requirements, too.
  3. Climate Considerations – Steeper roof pitches can help shed snow and prevent ice dams, while lower pitches may be more susceptible to snow accumulation and water infiltration.
  4. Roofing Material Compatibility – Asphalt shingles or metal roofing suit various pitches. In contrast, others, like slate or tile roofing, may have specific pitch requirements for proper installation and performance.
  5. Engineering & Structural Considerations – Steeper roof pitches may require additional structural support and engineering considerations to ensure stability and load-bearing capacity.

Before constructing or renovating a roof, talk to local building authorities and professional contractors to find out the allowable roof pitch and ensure compliance with building codes and regulations.


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