Building construction classifications are based on:

Building construction classifications are based on:

• A. Occupancy
• B. Each state's building department selects their own classifications
• C. Materials used in construction and hourly fire resistive ratings
• D. The height of the building

Answer: (C)

Building construction classifications are determined by the materials used for the structural elements and the fire-resistance ratings those elements must meet. This approach directly reflects how a building will behave in a fire—how quickly it might burn, how fire can spread, and how long the structure can maintain stability. Different construction types are defined by the combination of materials (such as noncombustible vs wood) and the tested hours of resistance for walls, floors, and roofs. Occupancy or use, while important for safety requirements, does not set the construction class, and height influences certain code protections but not the fundamental classification itself.

Building construction classifications are determined by the materials used for the structural elements and the fire-resistance ratings those elements must meet. This approach directly reflects how a building will behave in a fire—how quickly it might burn, how fire can spread, and how long the structure can maintain stability. Different construction types are defined by the combination of materials (such as noncombustible vs wood) and the tested hours of resistance for walls, floors, and roofs. Occupancy or use, while important for safety requirements, does not set the construction class, and height influences certain code protections but not the fundamental classification itself.