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 to cut slivers off the bottoms of some tiles but you d have to do that anyway.
Tiles sliding down wall.
Place the tile in place and give it a slight twist as you place it in it s final location.
Mastic is much stickier than mortar so you won t have to worry about the tiles sliding down the wall.
However i have used blue painter tape to temporarily hold tiles in place.
The thinset should not let the tiles moves.
Lay out one course of your tile the width of the back wall first on the floor with your chosen spacing.
If they do then its too watered down.
It should not move.
Hold it tight for about 20 to 30 seconds.
Place a field tile at your low point with a thin spacer underneath tile wedges or round toothpicks.
Tiling around a tub shower overview gregory nemec.
Then position the tile where it needs to go and add the spacers.
If the tile has been cut make sure you re placing it in the right spot.
But in reality floors often aren t level which means that approach would make your whole tile grid off level.
Take a tile for the edge of the wall and apply the adhesive to the back as if you were putting butter on a piece of toast.
Large heavy wall tiles are a challenge to hang because the weight of tiles makes them prone to slip off the wall.
Ferrante glued the tiles to the backer board with latex tile mastic not thinset mortar.
Mark the top of the tile and then using your level transfer that mark all around the shower.
Hang edge tiles by applying adhesive to the backs of the tiles.
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.