When thinset mortar is mixed with too much water or applied at an overly thin consistency, it completely compromises its structural integrity, shrinkage rate, and adhesive performance. A watery thinset mixture loses its ability to support the weight of heavy tiles, causing them to sag, slip out of alignment, or sink unevenly into the bed. Furthermore, excessive water disrupts the delicate chemical crystal matrix during the curing process, resulting in a weak, chalky, and brittle mortar bed that lacks tensile strength. This inevitably leads to hollow spots under tiles, debonding from the subfloor, and cracking under normal foot traffic.
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