What is the maximum number of tiers allowed in a ramp-accessed, single-use, open parking garage of Type IIA construction?

The maximum number of tiers allowed in a ramp-accessed, single-use, open parking garage constructed with Type IIA construction is established by building codes and standards governing these structures. In many jurisdictions, the International Building Code (IBC) specifies that a maximum of ten tiers may be allowed for such garages.

This regulation takes into account factors such as structural integrity, safety, accessibility, and the ability to effectively evacuate vehicles in case of an emergency. The choice of ten tiers enables the design to accommodate a significant number of vehicles while maintaining manageable ramps and clearances, contributing to both functionality and safety.

Further, options indicating a lower or higher number of tiers do not align with common regulations found in the codes applicable to Type IIA construction or the design and safety considerations for parking structures, which is why those choices are not applicable. A single-use parking garage must ensure that it meets the requirements without compromising on safety or design efficiency, which is critical for this type of construction. Therefore, the confirmed maximum of ten tiers represents the optimal balance of these factors.