Do not screw through sliding louver expansion keys unless the manufacturer detail calls for it.
Check
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.
Steps
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.
Say this to your 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?