Which rule applies to stairways serving three or more stories?

• A. Only the top floor requires labeling.
• B. Stairways do not need labeling.
• C. Labeling is required only during construction.
• D. All stairways serving levels three or more stories must have each floor labeled with the floor level and direction to exit discharge.

Answer: (D)

Clear wayfinding on exit stairs is essential in multi-story buildings. When a stairway serves three or more stories, the rule requires that every floor show the floor level and the direction to the exit discharge. This constant labeling helps occupants quickly identify where they are and which staircase to take to reach the exit outside, reducing hesitation and confusion during an evacuation. It keeps all floors oriented to the same exit path and supports faster, safer egress for everyone.

The other options fall short because labeling only the top floor doesn’t help those on lower floors, stairs do require labeling for ongoing occupancy, and labeling only during construction isn’t a safe, current requirement for life safety.