Got up the steps to patch some lifted wallpaper on a ceiling and found that it had lifted due the ceiling having dropped a bit. I am suspecting that someone had put weight on the L & P at some time - or the nibs of plaster have just failed over time.
I am wondering if there is a fix - such as generous squirts of No More Nails from above and then propping the sagged ceiling back up to the laths - or do I have to accept it is a lost cause and rip it all down (ugh the though of the mess in the new bathroom!!) The insulation is that blown in recycled newspaper stuff which would all need moving.