What is the allowable area for a Class A-1, Type IIB construction?

The allowable area for a Class A-1, Type IIB construction is determined by building codes and regulations, which take into account various factors including occupancy type, fire-resistance ratings, and construction type. In this case, a Class A-1 occupancy refers to assembly spaces used for gatherings such as theaters and auditoriums, while Type IIB construction is a non-combustible building structure.

For Type IIB buildings, the International Building Code (IBC) typically allows for a larger area compared to other, more combustible types of construction. The allowable area is calculated based on the specific occupancy and potential fire hazards associated with it.

For a Class A-1 occupancy, which often requires significant square footage for seating and amenities, the allowable area is set at 8,500 square feet in most code scenarios. This amount provides adequate space for the intended assembly use while ensuring that safety and fire egress standards can be maintained.

Thus, the correct answer reflects the numerical figure that aligns with the standards for this construction type and occupancy classification, supporting the operational needs of buildings designed for public assembly.