In Type 5 construction, which elements are made of wood or wood-like materials with smaller dimensions than Type 4?

• A. Exterior walls only
• B. Roofs only
• C. Exterior walls, bearing walls, floors, roofs, and supports
• D. Interior partitions only

Answer: (C)

Type V construction uses wood or wood-like materials for most structural elements, and those members are typically smaller in cross-section than the heavy timber or large-dimension members used in Type IV. That means the major structural components—exterior walls, bearing walls, floors, roofs, and their supporting members—are all built with wood or engineered wood products. Because these elements are combustibile and lighter in size, Type V structures are more sensitive to fire spread but can be built quickly and cost-effectively.

The other options don’t capture the full scope of Type V construction. Focusing only on exterior walls, or only on roofs, misses that floors and other supports are also wood-framed in this type. Similarly, limiting to interior partitions ignores the primary structural elements that are wood-framed in Type V.