Why should louver expansion keys be allowed to move?

Field answer

Some louver splice parts are meant to guide alignment, not clamp two frames into one rigid piece. Locking them with screws can stop thermal movement and stress the frame.

Check the submittal to see whether the key is structural, sliding, or alignment-only. Remove improper fasteners from sliding interfaces and reinstall the factory expansion hardware as designed.

What to check first

• Find the factory alignment/splice keys.
• Check whether screws pass through both frames and the sliding key.
• Look for buckling, sealant splits, or distorted tracks.
• Verify which parts should float versus fasten.
• Reset the joint before heat movement damages it again.

Why it matters

Locked expansion joints can fracture, leak, or distort the louver frame.

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Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.