In tilt-up construction, which direction should a panel be plumbed first?

• A. Left to right
• B. Top to bottom
• C. Front to back
• D. Diagonally

Answer: (A)

Plumbing a tilt-up panel means making its face exactly vertical. The first step is to establish the wall’s straight reference line by getting the panel plumb along its length—so you align it left to right. This sets the vertical plane in the direction that defines the wall line, which is where the rest of the panels will line up and mate with openings, columns, and bracing. Once that lateral plumb is correct, you can verify and adjust in the other direction as needed, but starting left to right gives you a stable baseline that minimizes cumulative error and keeps the wall aligned with the overall geometry. Plumb in other directions first would not provide as reliable a reference for the wall line and openings.