What are the five types of building construction?

• A. Type 1: Fire resistive; Type 2: Noncombustible; Type 3: Ordinary/Masonry; Type 4: Heavy Timber; Type 5: Wood frame
• B. Type A, Type B, Type C, Type D, Type E
• C. Type 1: Listed; Type 2: Precast; Type 3: Concrete; Type 4: Steel; Type 5: Timber
• D. I, II, III, IV, V

Answer: (A)

These five construction types describe how buildings are built and how they behave in fire, guiding firefighting tactics and expected fire spread. The first type is fire-resistive construction, where the structure and most components are made of noncombustible materials and built to withstand severe fire exposure for specified periods. The second type uses noncombustible materials throughout, though it may not have the same explicit fire-resistance ratings as the first. The third type is ordinary or masonry construction, with noncombustible exterior walls (often masonry) and interior elements that can be wood or light metal. The fourth type, heavy timber construction, relies on large timber members for the structural frame, which, despite being combustible, chars slowly and preserves strength for longer. The fifth type is wood frame construction, dominated by wood in the structural system, which burns more readily but is lighter and cheaper to build.

This option accurately lists the five standard construction types with their common descriptors, matching the fire service terminology. Other choices use nonstandard labels (Type A–E), mix different terms (listed, precast, concrete, steel, timber), or merely present numerals without the descriptive context, making them not align with the established classification.