Interior exit stairways and ramps must have a fire-resistance rating not less than the floor assembly penetrated, but must not exceed:

Interior exit stairways and ramps are critical components of fire safety in commercial buildings, providing essential routes for evacuation in the event of a fire. The requirement for these structures to have a fire-resistance rating that meets or exceeds that of the floor assembly they penetrate is vital because it ensures that the stairway or ramp remains intact and functional as a safe exit route during a fire.

The specific stipulation that the fire-resistance rating must not exceed 2 hours is rooted in building safety codes and standards, such as the International Building Code (IBC). This provision balances the necessity for adequate protection against fire with the practical aspects of construction and material limitations. A maximum of 2 hours ensures that the interior exit elements can withstand fire exposure long enough for occupants to evacuate safely while not imposing overly stringent construction requirements that could hinder building design and functionality.

Understanding these regulations helps ensure compliance with safety standards, which ultimately protects the occupants of a building during emergencies.