Fill in the gaps between the tiles using a rubber grout float.
Gap between shower floor and wall tile.
So to accommodate the flooring tile many like to leave a small gap between the last row of wall tile and floor.
Another option would be to fill the gap with grout.
This gap may widen over time as your home shifts.
Hopefully these tips help you with your project.
If your gap is smaller than 1 8 inch in width use regular caulk.
Solution would be to partially fill the gap about a half way with grout and to finish of read seal remaining with commercial grade 100 silicone caulk.
Plus a 1 16 gap allows the caulk to properly fill the space and waterproof the transition between the tile and tub or shower.
Grout is generally the best choice for filling joints between tiles in showers or elsewhere.
But where two tiled shower walls meet or where a shower wall meets the floor called change of.
And after installing the floor tile you can install that final or first row of wall tile.
This joint should then be filled with 100 silicone to allow for expansion and contraction as well as providing a waterproof layer.
Similar to the gap that can exist between your wall tile and tub you may have a space between the floor and your bathtub.
Fill gaps larger than 1 8 inch.
Some like to use a ledger or other space saver to indicate where your missing row should be.
In addition leave a 1 16 to 1 8 expansion joint between the main wall tile and shower floor tile or adjacent wall tile.
Soak a sponge in water and wet the tile with it.
If you have tile on the wall adjoining the tub select a caulk that matches the color of the grout.
Since you are joining two different materials together you should use caulk in the space where the floor tile and tub meet.
Place the 1 16 horseshoe shim on tub and measure up to the laser level.
As with any other gap near your bathtub you ll want to close the opening to prevent any possible water damage or the onset of mold and mildew.
Grout the gaps between the wall tiles take out the spacers and prepare the sanded grout mixture.