The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
Leave gap tile shower wall.
Once the thinset has dried for 24 hours remove the spacers and prepare the wall for grout.
If your gap is smaller than 1 8 inch in width use regular caulk.
Or fill the gap with grout.
If you have tile on the wall adjoining the tub select a caulk that matches the color of the grout.
Make sure that you leave a 1 4 inch expansion gap at the bottom.
And after installing the floor tile you can install that final or first row of wall tile.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
This makes the corner joint less noticeable and more aesthetically pleasing.
Here s how to install shower wall tile after you ve prepped the area.
For example if tile is being set on the main shower wall then leave a 1 8 expansion joint between the tile edge and adjacent backer board.
Fill gaps larger than 1 8 inch.
So to accommodate the flooring tile many like to leave a small gap between the last row of wall tile and floor.
Some like to use a ledger or other space saver to indicate where your missing row should be.
By the way we highly recommend tiling the main shower wall then the side walls.
Most tile have a recommended grout that works well with them so check your.