Does "the plaster stripping off the walls" mean "a wall with fallen chunks of plaster"?
The rumours of the strange doings which occurred in the Eddy homestead had got abroad, and raised an excitement similar to that caused by the Koons's music-room in earlier days. Folk came from all parts to investigate. The Eddys seem to have had ample, if rude, accommodation for their guests, and to have boarded them in a great room with the plaster stripping off the walls and the food as simple as the surroundings. For this board, of course, they charged at a low rate, but they do not seem to have made any profit out of their psychic demonstrations.
From The History of Spiritualism, Vol. I by Arthur Conan Doyle.