Concerning the tile inside the steam shower, the only thing I know is that I am using ceramic on the walls, porcelain on the floor and seat and an accent of some glass tiles. They are all from different manufacturers. I would have thought that Thermasol would know about the thinset. Must these tile manufacturers be contacted?
Also, I did mention the TCNA book to my contractor. He did not seem to be aware of it but will check into it.