When we ask who has the last word in the use of tile-related products or procedures, we need to begin with a firm foundation. The TCNA Handbook and American National Standards Institute (ANSI) specifications are the foundation or the starting point when we look at the how and/or why of properly installed tile.
The Industry Standards and Details: As an example, we will look at the requirements of a shower receptor installation as found in the Handbook detail B415. Under the Membrane Options section it states: “A waterproof membrane (A118.10) or vapor retarder membrane (A108.02-3.8) must be specified for walls to prevent moisture intrusion and protect adjacent building materials. Specifier shall indicate if complete waterproofing of walls is required, including treatment at termination points.”