In sandwich wall panel casting, which statement is true?

• A. The exterior wythe pour and insulation/connector placement occur simultaneously
• B. The exterior wythe pour occurs after insulation placement
• C. The panel is poured in a single pour
• D. The insulation is poured after the second pour

Answer: (A)

In sandwich wall panel casting, the outer concrete skin (the exterior wythe) is poured first, and the insulation layer along with the connector hardware is placed in the cavity during or right after that pour so the panel can be completed with a second pour to form the inner wythe. This simultaneous action ensures the insulation sits exactly between the wythes and the connectors are correctly positioned to tie the two concrete skins together for the final strength and thermal performance. If you tried to place insulation before the exterior pour, or after the second pour, you’d disrupt the intended sandwich geometry and the panel wouldn’t achieve the proper thermal break and structural connections. A single pour cannot create a true sandwich with insulation between two concrete skins.