What is behind my 1940s bathroom tile?
I recently had the pleasure of seeing 30+ of my bathroom tiles come crashing off the wall into the tub. I'm chalking this up to some cracked/missing grout which led to moisture behind the tile. There appears to be some sort of cement behind the tile, though I'm having trouble identifying it. I should say that I do not have the money or time to demo the walls and start over, and am leaning toward a mixture of re-tiling/re-grouting for a current solution. I am, however, concerned about mold and wonder how moisture-resistant the cement material is. Any suggestions?