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Unread 11-21-2002, 04:14 PM   #2
Dave Gobis
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Join Date: May 2001
Location: Racine, WI.
Posts: 5,554
It is them greenboard showers again. I can not disagree entirely with Mr. Wessel, but, I have never seen a shower installed in my lifetime that followed their (Gypsum Associations) recommendations. Here is a copy of what I forwarded to him.

Greenboard has not been a recommended substrate for ceramic tile in wet areas for a number of years. The issue is a little more complex than Mr. Wessels comments and space may have allowed you. There are standards for tile installation in the United States. They are referenced by virtually every major American manufacturer of tile and setting material in their literature.

The Tile Council of America, Inc. (TCA) publishes the Handbook for Ceramic Tile Installation, The Handbook is a guide for anyone who uses, works with or specifies ceramic tile. It clarifies and standardizes installation specifications for ceramic tile in the United States. It is a quick-reference details that outlines most installation methods and conditions such as exterior and interior floors, exterior and interior walls, ceilings and soffits, bathtubs walls, counter tops, renovations, shower receptors, steam rooms, swimming pools, fire-related and sound-related walls, etc. The book provides a guide on recommended uses, limitations, requirements, materials, preparation by other trades, movement joints, installation specifications and references ANSI and ASTM standards. The information presented in the Handbook for Ceramic Tile Installation represents a consensus of more than 23 national and regional organizations.

The United States has used the ANSI (American National Standards Institute) A108 as its standard for installation many years. This document sets the definitions and standards for proper installation of ceramic tile. The A108 was last published in 1999. One of ANSI's requirements is that standards are revisited and re-approved every five years. The Tile Council is approved and recognized as the secretariat for the ANSI standards for the ceramic tile industry. All of the ANSI and ASTM (American Society for Testing Materials) standards, definitions, and methods are subject to open review called transparency. This prevents any one group or industry segment from dominating the process and thus promulgating inferior standards. These standards are designed to act as a platform for establishing commonality between the producer, specifiers, middlemen, installers, and end users. Organizations are invited to participate in the standards generating process. Those that have an identifiable interest are invited to send voting members to the committee meetings. The existing committee then approves new applications. It is not an individual serving on the committee but rather an appointee of the organization he or she represents. The fact that standards are being considered and balloted is published in ANSI notifications such that all potentially interested parties are notified. No legitimate interest is excluded and anyone may submit comments and suggestions to the committees. The make up of the committee is audited by ANSI to confirm that no segment dominates the process. Guests may be invited to sit in on meetings to state any particular viewpoint. Once the committee completes its deliberations a draft of the standard is prepared and submitted to ANSI for balloting. To be considered for a standard all one must do is submit their proposed product, installation specifications, and supporting ASTM recognized test data.
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