Im going to tile my bathroom with travertine tiles. the tiles come on a 12X12 sheet(tiles are like 2.5" X 1.5"). i have always used mastic for 6X6 ceramic and smaller. Thinset on 8X8 and larger. I have used mastic on ceramic 12X12 sheets. I have never worked with travertine. So my question is thinset or mastic?
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