I'm in the process of cutting and laying a 3' x 2' tile mosaic for a sunken shelf in my shower. Since the piece is vertical, I'm laying the cut tiles on a 1/4" backer board mount, then using thinset to attach the mount to the wall.
Many of the pieces are an square inch or less in size, and I would rather not try to use thinset to attach them to the board. Does anyone see a problem if I just laid them down with liquid nails, then grouted once on the wall? The stuff seems pretty strong and waterproof. The mosaic will never be exposed to a direct stream. It will just be exposed to steam from the shower.
If not liquid nails, what else might work well for this? Or, should I just stick with thinset?
Thanks in advance.
-Tim