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Unread 06-23-2008, 10:55 AM   #1
Bella Vista
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Join Date: Apr 2008
Posts: 15
modified vs unmodified

We produce porcelain tile and my understanding has been to set it with a good modified. Now I hear that with kerdi you have to use unmodified. Is there a significant difference? We are talking about decorative tile on the wall. The tiles vary in size from 1 x 1 to 10 x 10. The main issue with modified is it needs some porosity or air exposure to cure. With unmodified the cement base will harden without exposure to air. But if you have it sandwiched between kerdi and large porcelain or kerdie and whatever nonporous, where does the moisture go? These are big questions that confound my little mind. Jim
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Unread 06-23-2008, 11:25 AM   #2
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Jim, the only place for the moisture to go is to the grout lines. That's why it takes so much longer for modified thinset to "dry." Smaller tiles are less of a proplem, and deco wall tiles in dry areas are also less of a problem. It's not likely you are using Kerdi in a dry area, except as a base for home-made mosaic designs.
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