Which of the following is NOT a listed use for metals in buildings?

• A. Insulation
• B. Structural support
• C. Decorative coverings
• D. Fasteners

Answer: (A)

Metals in buildings are chosen for strength, durability, and finish, so they’re typically used for structural support (steel or aluminum framing), decorative coverings or architectural cladding, and fasteners (bolts, screws, nails) that hold assemblies together. Insulation is not a listed use for metals because metals conduct heat rather than insulate. While you might see metal facings or reflective sheets as part of a insulation system, metals themselves aren’t used as the insulating material. Therefore, insulation is the option that isn’t a listed use for metals in buildings.