Understanding Construction Types
The International Building Code (IBC) Chapter 6 classifies building construction types based on material combustibility and fire resistance.
Type II construction is noncombustible, meaning it is built using materials such as steel or concrete that do not contribute fuel to a fire.
The difference between Type IIA and Type IIB is the level of fire resistance.
2. Fire Resistance Rating Requirement
Type IIA construction requires a minimum 1-hour fire-resistive rating for structural elements, meeting the conditions in the question.
Type IIB, on the other hand, has no minimum fire-resistive rating for structural components, making it less protective than Type IIA.
3. Verification of Other Options
Option B (IIB) - Incorrect, as Type IIB has no fire-resistive rating for its structural elements and does not meet the 1-hour requirement.
Option C (IIIB) - Incorrect, as Type III allows combustible exterior materials and is not entirely noncombustible.
Option D (VA) - Incorrect, as Type V construction is wood-framed and does not meet the requirement for noncombustible materials.
Reference Sources:
International Building Code (IBC) 2021 - Chapter 6 (Types of Construction) NFPA 220: Standard on Types of Building Construction ICC Fire Inspector II Study Guide (2021)