The other main consideration is where the tiles will be set on the floor or on the walls and ceilings.
Trowel size for mosaic wall tile.
The larger the tile the larger the trowel.
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If one of the tiles is fairly flat with minimum warping cupping you may meet the proper coverage requirement using a 3 8 square notched trowel.
Finding the right trowel for the job is quite simple when you know that generally speaking the trowel size should match up to the tile size the smaller the tile the smaller the trowel.
Tile trowels come in many shapes and sizes generally starting out from a 3 16 v notch up to the 1 2 square notch.
Twelve inch square tiles for instance are best applied using a trowel with 1 2 inch by 1 2 inch notches.