Which material is NOT listed as a material for supporting metal channels?

Which material is NOT listed as a material for supporting metal channels?

• A. Aluminum
• B. Hot-rolled steel
• C. Cold-rolled steel
• D. Coated with rust inhibiting material

Answer: (A)

Metal channels used to support plaster or gypsum board are typically steel, coming in hot-rolled or cold-rolled forms, and they’re often galvanized or finished with a rust-inhibiting coating. Aluminum isn’t normally specified for these supporting channels because steel provides the necessary strength and stiffness at a lower cost for standard lath and plaster or drywall systems. The rust-inhibiting coating is simply a treatment applied to steel, not a separate material type, so the practical materials list centers on steel. Therefore, aluminum is not listed as a material for supporting metal channels.

Metal channels used to support plaster or gypsum board are typically steel, coming in hot-rolled or cold-rolled forms, and they’re often galvanized or finished with a rust-inhibiting coating. Aluminum isn’t normally specified for these supporting channels because steel provides the necessary strength and stiffness at a lower cost for standard lath and plaster or drywall systems. The rust-inhibiting coating is simply a treatment applied to steel, not a separate material type, so the practical materials list centers on steel. Therefore, aluminum is not listed as a material for supporting metal channels.