The way I see it
(1) One- and Two-family dwellings.
(2) Multifamily dwellings permitted to be of Types III, IV, and V construction except as prohibited in 334.12
These are the residential type occupancies.
(3) Other structures permitted to be of Types III, IV, and Type V construction except as prohibitied in 334.12. Cables shall be concealed within walls, floors or ceilings that provide a thermal barrier of material that has at least a 15-minute rating as identified in listings of fire-rated assemblies."
These would be other than residential type ocupancies.
I would think that a finished drywall ceiling would solve the problem.
I would also let him fight with the GC.
