You could try to put some plaster buttons (stainless steele perforated
washers for securing loose plaster)in with 1"5/8 drywall screws into the
joists but I've found they don't work on ceilings as well as they do on
walls but you could give it a try...If it were me I would just go right over
the old plaster with 5/8 MR drywall with 3 inch drywall screws into the
joists..No demo mess....Hire a pro..In and out in 2-3 days DONE ready for
paint...Once a ceiling starts to go , patching will be an on going job till
it's all down anyway...Put up a Hard Hat Area sign if you patch
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