Drywall-Over-Plaster Ceiling Repair
Repair badly cracked plaster ceilings by covering them with a layer of 1⁄2-in. drywall.
I often repair badly cracked plaster ceilings by covering them with a layer of 1⁄2-in. drywall. Fastening the drywall to 3⁄4-in.-thick furring strips enables wiring and ceiling boxes for light fixtures to be mounted beneath the plaster. In this situation, the wiring is close to the surface of the drywall, so I use conduit or armored cable, rather than Romex.
— Tom O’Brien, New Milford, Conn.