Yes the paper has come away from the back of the plaster board and the board has dropped down slightly, falling away from the wooden joist. I could remove the…

Found this stuff , it apparently binds the loose chalky plaster together to allow a good surface to stick new paper onto.

Thanks Stewie
I tried some aquadhere on the paper to plaster and it sort of stuck , plaster is so porous its very difficult to get anything to aghere to it.…

Hi
Water damage has removed the paper/cardboard covering of a few of the ceiling Gyprock/ plaster boards , the boards have fallen away from the ceiling joist about 1/2" and I…