A batten board is nothing more than a 1 x4 or 1 x2 board screwed directly into the wall horizontally.
How to stop slipping of large tiles on the wall.
Large format tiles greater than 12 inches placed horizontally on walls tend to make a space feel bigger because there are fewer lines to break up the surface visually.
But in reality floors often aren t level which means that approach would make your whole tile grid off level.
Hang a batten board to prevent tile slippage.
Mark the top of the tile and then using your level transfer that mark all around the shower.
Even with some patterned tile such as marble you can still accomplish this feeling if the pattern runs horizontally.
Place the tile in place and give it a slight twist as you place it in it s final location.
Two things have occurred to me.
The thinset should not let the tiles moves.
It should not move.
1 get a bunch of different sized spacers and use them according to what fits possibly using a knife to cut them in half.
Large heavy wall tiles are a challenge to hang because the weight of tiles makes them prone to slip off the wall.
Normally one would use spacers to keep wall tile from sagging while the adhesive dries but with this stuff i m not sure.
However i have used blue painter tape to temporarily hold tiles in place.
Use of a large trowel 1 2 x 1 2 inch square notch or 3 4 x 3 4 inch rounded notch will help ensure that the mortar adequately covers the substrate.
Hold it tight for about 20 to 30 seconds.
In theory the easiest solution is to build from the bottom supporting the lowest tile course right on the floor and letting the upper courses rest on those.
Lay out one course of your tile the width of the back wall first on the floor with your chosen spacing.
If the bottom is not level then pick the low spot and measure one tile up from there and level over so you may need.
Place a field tile at your low point with a thin spacer underneath tile wedges or round toothpicks.
Good technique is to pull a level line one tile up from the bottom of the wall.
Tips for tiling a wall.
A batten board helps you start your bottom most course or row of tiles.