We have a project where the the demising walls go all the way to the underside of the floor trusses and the ceiling drywall is attached to the bottom chord of the floor trusses. The structural engineer has called for deflection clips at all the non-bearing partitions which will include some demising walls. The concern is over the integrity of the seal between the demising wall and the ceiling if the trusses (to which the ceilings are attached) are allowed to move.

Has anyone dealt with a similar issue of airtight drywall sealing and deflection?

Thanks,