Which problem can hinder the erection process if panels are not stacked in the correct order?

• A. Cranes on track
• B. Wind direction increases
• C. Panels stack cast in the wrong order
• D. The color of concrete

Answer: (C)

In tilt-up construction, the order that panels are stacked for lifting and placement matters because each panel is designed to fit into a specific location with matching interfaces, openings, and edge conditions. When panels are stacked in the wrong order, the next panel may not align with the already-erected wall or with the forming system, making it difficult or impossible to lift into place, connect, or seal joints. This can halt progress, require re-stacking or repouring, and create safety risks as crews attempt to force mismatched panels.

Other options don’t tie directly to the sequence of stacking. The presence of cranes on track relates to equipment placement rather than the panel order itself. Wind direction affects hoisting conditions but not the fundamental need for proper stacking order. The color of concrete has no impact on erection sequencing.