The large format 18 inch tiles should have inch space in between.
Gap between wall and floor tiles bathroom.
This expansion joint allows for natural shifting and movement which can occur in your home over time.
The gap goes 3 5cm to 4cm back to the breeze block.
The sole purpose of grout is to fill the spaces between tiles after the tiles have been glued in place on a floor or on a wall.
In addition leave a 1 16 to 1 8 expansion joint between the main wall tile and shower floor tile or adjacent wall tile.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
Doing so will prevent moisture from accumulating which can also protect against the growth of mold and mildew.
Many bathrooms are built with an intentional gap between the wall tiles and the bathtub.
The overall finish of your job really does depend on your own personal style.
Grout between the tiles.
Caulking is the best choice for this application.
There is a gap of say 5mm to 8mm give or take high between where the floor tiles meet the wall tiles in the bathroom.
Grout fills the joints between tiles.
Current trends are moving towards leaving much smaller grout lines between tiles.
Caulk between the wall and tile.
These gaps exist between tiles that are on the floor as well as between tiles where the floor and the wall touch.
Grout keeps the tiles from.
Never fill this gap with grout because tile grout is not flexible.
For smaller tiles is advisable to use small spacers.
Hopefully these tips help you with your project.
I m guessing its the thickness of the dot and dab then plaster board then tile adhesive then tile.
Most of these cracks can be sealed with caulk.
As the tiles increase in size a larger gap becomes acceptable.