Correct a loose corner after assembly

Before you start

• Determine whether the corner is only loose or whether the lock edge, S-cleat, or duct panel is torn.
• Support both sides of the joint before removing hardware.
• Remove old loose sealant only as needed to expose the mechanical problem.

Lay it out

1. Identify which plane moved: side wall, top/bottom hem, or the entire section.
2. Check the adjacent hanger elevation and joint alignment so the repair does not fight an unsupported run.

Set and support it

1. Unload the joint using the existing hangers, lift, or temporary support.
2. Clamp the corner square without denting the panel.
3. Hold the corrected position until the replacement drive is fully seated.

Make the connection

1. 1

   Back out or remove the loose drive carefully.

2. 2

   Inspect and straighten minor lock deformation with a hand seamer.

3. 3

   Replace damaged cleat or drive with the correct approved piece.

4. 4

   Re-engage the corner and seat the drive fully.

5. 5

   Secure the drive end and restore the required seal.

6. 6

   Release support slowly and recheck the corner.