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The plasterboard is moving and the screws don't move so they pop a piece of plaster out. You can unscrew the screws and add washers to spread the load and try and secure the plasterboard or fill them and cover the entire ceiling with a specialised lining paper so it doesn't keep happening. Well at least you don't see it.
Airhead-
Would a flexible filler help? I will try the washer trick and report back @Airhead
frankohara
I found these guys under areas of loose plaster. Do you have any suggestions before I fill them with some all-purpose filler? Is it normal that a plaster screw will prevent the plaster from settling over it and creating “blisters”?
For reference, this is in a loft under a flat roof, probably a massive bodge by someone sometime in the recent past 🤷🏻
I just want to avoid the same problem happening again and again and again … Thanks!