How many inches should a panel be within plumb prior to releasing the rigging?

• A. 2 inches
• B. 4 inches
• C. 6 inches
• D. 8 inches

Answer: (B)

In tilt-up work, you want the panel to be almost vertical and settled before removing the rigging. The standard tolerance used is four inches from true plumb. This means the panel’s face is allowed to deviate up to four inches from vertical along its height when you check it.

Why four inches works: it gives a practical margin so the temporary supports and hold-downs can control small remaining movements as the rigging is released and permanent connections take load. If you release too soon with a larger misalignment, the panel could tilt, shift, or place unexpected stresses on anchors and braces, risking damage or instability. Four inches is wide enough to account for minor settling and measurement error, yet tight enough to prevent dangerous movement once the rigging comes off.

How to apply it: measure with a plumb line or laser/level to see how far the panel is from true vertical. If it’s within four inches, you can proceed with releasing the rigging and finishing bracing and anchoring. If it’s farther, you should pause, correct the alignment, and recheck until you’re within the tolerance.