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It depends on the size of the tile. Use a smaller 5/32" V-Notch Trowel for 3/4" or smaller glass mosaics, a 1/4" x 1/4" trowel for 2" x 2" mosaic tiles. For bigger 12" x 12" or heavier tiles use a trowel with bigger notches like 1/2" x 1/2" so the bond mortar (thinset) will be thicker.

The 2011 Tile Industry Standards define the minimum bond layer thickness to be 3/32" after beat in, but the maximum thickness has more to do with the manufacturer of the thinset mortar you are using. Many "thinsets" max out at 1/4" in a single layer. "Medium Bed" types of thinset may go up to 1/2" or more, but you must follow the manufacturer's instructions. Thinset mortars made thicker than they were designed for can shrink and crack the tiles.

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Jolie Lind

Lvl 10
2y ago

What else can I help you with?