What is the standard stair riser and going?

What are the Standard Stair Riser and Going Dimensions?

Brief Summary

In the United States, building codes typically mandate a maximum riser height of 7 inches (178 mm) and a minimum tread depth (going) of 11 inches (279 mm). However, variations exist depending on specific building codes and occupancy types.

Expanded Answer

Defining Riser and Going

• Riser: The vertical component of a stair step, measuring the height between two consecutive treads.
• Going (or Tread Depth): The horizontal distance from the edge of one tread to the edge of the next, where the foot is placed.

Standard Dimensions and Building Codes

• International Building Code (IBC):
  • Maximum Riser Height: 7 inches (178 mm)
  • Minimum Tread Depth: 11 inches (279 mm)
• International Residential Code (IRC):
  • Maximum Riser Height: 7 ¾ inches (197 mm)
  • Minimum Tread Depth: 10 inches (254 mm) with nosing, 11 inches without nosing.

Variations in Standards

• Occupancy Type: Building codes can specify different requirements for various occupancy types, such as residential, commercial, or industrial buildings.
• Local Amendments: Local jurisdictions may have additional or amended requirements beyond the model codes.
• Existing Structures: Existing staircases in older buildings may not conform to current codes but are often grandfathered in as long as they meet certain minimum safety criteria.

The Importance of Proper Riser and Going Dimensions

• Safety: Incorrect riser and going dimensions can lead to tripping hazards and falls, especially for those with mobility challenges.
• Comfort: A well-designed staircase with appropriate riser and going dimensions provides a comfortable and effortless ascent and descent.
• Code Compliance: Adherence to building codes is essential for ensuring safety and avoiding potential legal issues.

Remodeling and Design Considerations

• Space Constraints: When space is limited, designers may explore options like steeper stairs with shorter treads or incorporating winders. However, these options must still comply with minimum safety requirements.
• Aesthetics: The riser-to-going ratio can impact the visual appeal of a staircase. A shallower rise and longer going create a more gradual and elegant staircase.
• Accessibility: Consider the needs of all potential users when designing or remodeling a staircase. Older adults or individuals with disabilities may require shallower risers and wider treads for easier navigation.

Conclusion

Understanding standard stair riser and going dimensions and their relationship to building codes is crucial for ensuring the safety, comfort, and code compliance of your staircase. Whether building a new staircase or remodeling an existing one, consult local building codes and consider the specific needs of your household to create a functional and aesthetically pleasing staircase.