Thinset mortar should typically be applied at a finished thickness ranging between three-sixteenths of an inch and a quarter of an inch after the tiles have been firmly pressed and embedded into the combed ridges. To achieve this correct depth, installers select a notched trowel with notch sizes tailored to the specific dimensions of the tile—larger tiles require deeper notches to ensure complete mortar coverage and eliminate hollow spots. Applying thinset too thinly results in poor adhesion and cracked tiles, while applying it excessively thick can cause tiles to drift, sink unevenly, or take an overly prolonged time to cure properly.
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