Thinset mortar should typically be applied at a finished thickness ranging from three-sixteenths of an inch to a quarter of an inch after the tiles have been firmly pressed and embedded into the ridges. To achieve this correct depth, installers use a notched trowel with notch sizes specifically chosen to match the dimensions of the tile being installed—larger tiles require deeper notches to ensure adequate mortar coverage. Applying thinset too thinly results in incomplete adhesive contact and hollow spots, while applying it excessively thick can cause tiles to drift, float unevenly, or take an excessive amount of time to cure properly throughout the mortar bed.
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