What is the overall minimum width that must be maintained for spiral stairways?

To determine the appropriate minimum width for spiral stairways, it is essential to consider safety and accessibility standards outlined in building codes. The correct minimum width for a spiral stairway is 26 inches. This width ensures that individuals can comfortably navigate the stairs while also accommodating safety regulations, particularly in emergency situations where quick egress may be necessary.

The specified width allows enough space for individuals to ascend or descend without the risk of falling or injury, considering that spiral stairways can often be more confined than traditional staircases. Additionally, this measurement is crucial for maintaining compliance with the National Fire Protection Association (NFPA) codes and the International Building Code (IBC), which aim to protect occupants in commercial buildings.

Other potential width options typically fall short of providing adequate space for safe movement. A width of less than 26 inches does not allow for the ease of use that is critical for all building occupants, including those who may have mobility challenges or are carrying objects. This highlights the importance of adhering to the established minimum standards for stairway design in commercial buildings.