Type 1 construction is defined as construction where structural members, including walls, columns, beams, floors, and roofs, are made of noncombustible or limited combustible materials and have a specified degree of fire resistance.

• A. Type 1 construction
• B. Reinforced concrete
• C. Protected steel
• D. Rain or Snow Roof

Answer: (A)

The key idea is fire-resistive construction: the building uses noncombustible or limited combustible materials for its structural elements and each component is designed to meet a specified fire-resistance rating. That combination—noncombustible or limited- combustible materials plus defined fire resistance for walls, columns, beams, floors, and roofs—characterizes the most fire-resistant class of building construction.

This description fits Type I construction because it emphasizes both the material category and the required fire resistance for all major structural parts, which is exactly what Type I is designed to achieve, especially in high-risk or high-rise structures.

Other terms point to specific materials or methods rather than the overall construction classification. Reinforced concrete refers to a material system used within many construction types and isn’t by itself the classification described. Protected steel describes a technique to achieve fire resistance, often used within Type I or other types, but it’s not the construction type name. Rain or Snow Roof is a roof type and not a construction category.