What form material is typically used for sandwich panels?

• A. Plywood
• B. Concrete
• C. Steel
• D. Fiberglass

Answer: (A)

Formwork is the temporary mold that shapes the concrete as each panel is poured. For sandwich panels in tilt‑up construction, a simple, smooth, and reusable surface is essential, and plywood serves that role best. It provides a clean finish on the concrete faces, is inexpensive, and can be reused many times, which keeps production fast and cost-effective. Plywood also adapts easily to panel sizes and edge details, making setup quick between pours. While steel or fiberglass forms exist, they’re typically more costly and slower to deploy for standard sandwich panels, so plywood remains the practical default.