There has been an ever-expanding school of thought during the past few decades devoted to waterproofing ceramic installations. The author looks a little more closely at it.
There have been many waterproofing methods attempted, with some proving successful while others have failed. These efforts led to a decree by the Materials and Methods Standards Association (MMSA) authorizing the formation of a committee to establish standards. This resulted in an ANSI document: American National Standards Institute specifications for load-bearing, bonded, waterproofing membranes for thin-set ceramic tile and dimension stone installation, a document found under the heading "A-118.10."