Static field route #19627

What do I do when louver expansion alignment keys were screwed solid?

Equipment Connections: RTU, AHU, VAV, Fans & Louvers⚠️ CHECK FIRSTField answer expansion

📖 Verified core answer

Expansion keys align sections while allowing movement. If someone screws them rigid, remove the lockout and restore the factory sliding detail.

Open in Field Rescue Open category

Field verification checklist

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.

Ask foreman

The louver expansion keys at [location] were screwed solid through the frames. I checked the splice detail. Do you want me to remove those screws and restore the sliding joint?

Text to foreman

Route options

A Correct it only if the fix is within your assignment and approved method.

B Hold and document if it affects water intrusion, weatherproofing, rated assemblies, structural anchorage, controls, TAB, or another trade.

C Bring the foreman/detailer the location, what you checked, and what decision you need before sealing, testing, cover, or startup.

Do not do this

Do not screw through sliding louver expansion keys unless the manufacturer detail calls for it.

Why this matters

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

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

Search helpers: louver expansion keys alignment splice screwed solid thermal movement