What is the minimum tread depth for stairways that provide access to control rooms in Group I-3 facilities?

The minimum tread depth for stairways that provide access to control rooms in Group I-3 facilities is established as 11 inches. This requirement is in place to ensure safety and accessibility, particularly in environments where individuals may need to navigate stairs quickly or under stressful conditions, such as in a control room setting. The depth of the tread helps to prevent slips and falls, providing a more stable footing.

In the context of Group I-3 facilities, which often house individuals who may be confined involuntarily, such as in detention or correctional facilities, proper stair design is not only crucial for safety but also for compliance with building codes. The emphasis on the appropriate dimensions for treads is reflective of best practices in building design that prioritize the safety and comfort of all users, particularly in high-stress situations. Therefore, the correct minimum tread depth being 11 inches ensures that these facilities operate safely and effectively.