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Also the tiles collapse in a soggy mess if you have a water leak from above.
Not just with a water leak. When I was helping to decommission T1 at Heathrow after a couple of weeks of the terminal being mothballed you'd be wandering around the terminal and hear random whump noises echoing through the empty corridors. After a couple of weeks of this some bright spark figured out that the ceiling tiles were shrinking back now that the AC was no longer on and just randomly falling out of the ceiling.
Bobbo
Plasterboard will be too heavy for the grid to support without adding more anchor points into the ceiling.
False ceilings are used in offices as its easy to move fixtures as the seating plan changes, hide bare pipework and bad wiring.
Rip it out and ask for money off in the purchase price.
Also the tiles collapse in a soggy mess if you have a water leak from above.