Place a field tile at your low point with a thin spacer underneath tile wedges or round toothpicks.
How to stop slipping of large tiles on the wall.
Hold it tight for about 20 to 30 seconds.
Even with some patterned tile such as marble you can still accomplish this feeling if the pattern runs horizontally.
To achieve an adequate bond for large format natural stone floor tile the bonding material must evenly and thoroughly cover the area beneath the tile.
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.
Normally one would use spacers to keep wall tile from sagging while the adhesive dries but with this stuff i m not sure.
But in reality floors often aren t level which means that approach would make your whole tile grid off level.
A batten board is nothing more than a 1 x4 or 1 x2 board screwed directly into the wall horizontally.
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.
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.
Lay out one course of your tile the width of the back wall first on the floor with your chosen spacing.
Large heavy wall tiles are a challenge to hang because the weight of tiles makes them prone to slip off the wall.
1 get a bunch of different sized spacers and use them according to what fits possibly using a knife to cut them in half.
Mark the top of the tile and then using your level transfer that mark all around the shower.
It should not move.
If they do then its too watered down.
Hang a batten board to prevent tile slippage.
A batten board helps you start your bottom most course or row of tiles.
Two things have occurred to me.
The thinset should not let the tiles moves.
Tips for tiling a wall.
Don t start it at the floor.
Place the tile in place and give it a slight twist as you place it in it s final location.