How to Repair Sagging Plaster on Walls and Ceilings
A plaster washer is a thin metal disk that increases the size of the head of a drywall screw so that it doesn t pull through the plaster You thread the drywall screw through a plaster washer and then drive it through the plaster and into the ceiling joists wall studs or wood lath The screw and washer pull the loose plaster tight against