In Group I-3 facilities, what is the allowable minimum tread depth on stairs providing access to control rooms?

In Group I-3 facilities, which are typically associated with institutional occupancy such as correctional facilities or psychiatric hospitals, safety and accessibility are critical concerns. The International Building Code (IBC) outlines specific requirements for stairs in such facilities, focusing particularly on tread depth, as it directly impacts user safety.

The allowable minimum tread depth for stairs in control rooms is set at 9 inches. This dimension is important because a tread depth of at least 9 inches provides adequate space for users to place their feet securely, reducing the risk of slips and falls. This requirement reflects a balance between safety measures and the operational needs of the facility, ensuring that access to control rooms is both functional and safe.

When designing or inspecting stairways in Group I-3 facilities, it is essential to adhere to this minimum tread depth to comply with building codes and ensure the safety of individuals navigating these spaces.