1 4 x 3 8 square notch.
Trowel for wall tile.
A great trowel for installing small ceramic tile such as 4 25 x 4 25 6 6 and 3 6 subway tile is this 1 4 inch square notch trowel.
Twelve inch square tiles for instance are best applied using a trowel with 1 2 inch by 1 2 inch notches.
This may also be a good trowel size for thicker 5 16 mosaics.
This thin set mortar is applied onto the wall or floor surface with a notched trowel providing the tiles with a base of ridged mortar that when compressed provides a complete bond with the.
The larger the tile the larger the trowel.
Mosaic tiles and wall tiles up to about 4 by 4 inches call for a v notch trowel with 3 16 by 1 4 inch notches while larger tiles require a trowel with a square or u shaped notch to obtain proper adhesive coverage.
When you use a 1 4 x 3 8 square notched trowel you will leave 1 4 wide by 3 8 high ridges of thinset on the substrate with spaces between each ridge.
Also make sure the thin set mortar you hand mix yourself is also rated for vertical surfaces.
As 1 2 trowel means that both measurements are the same.
Anytime you use 12 x 12 or smaller vertical wall tile you always use a v notched trowel rated for tile installations since it is made specifically for vertical surfaces to bond the mastic mortar successfully.