Bathroom ceiling plastering question

The ceiling in my bathroom was wallpapered and I have been scraping it off. I have found there to be 2 layers of material on the ceiling under the wallpaper. One is a solid, smooth brown layer. Under that looks like a very thin tissue paper and then the plaster. At places, the brown layer practically falls off, in others it takes off deep pieces of plaster if I try to remove it.

I plan to tile the part of the ceiling over the tub and skim coat the rest of the ceiling.

My question is, should I attempt to remove the brown layer? Also, how long in my bathroom can the ceiling remain exposed all the way down to the plaster?

Thanks for your help,

TJ

By TJR |