On Sun, 15 Dec 2013 17:33:17 -0800, Oren wrote:

On Sun, 15 Dec 2013 20:16:31 -0500, wrote:

Greenboard
was never recommended for wet locations.

I think it was at one time, then another product was blue board,
later.

Damp, yes. Wet, no. Blue board is better but still not acceptable.
Before cementatious board, tile was done with lathe and mortar.