Gap Between Tiles And Wall
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
Gap between tiles and wall. Ceramic tile wall gap back of tile should rest on finished wall. Two inch tiles are factory spaced and sheet mounted. If your gap is smaller than 1 8 inch in width use. As the tiles increase in size a larger gap becomes acceptable.
The overall finish of your job really does depend on your own personal style. Never fill this gap with grout because tile grout is not flexible. Your walls and floors are pretty stiff but there can be movement between the two that will crack the grout. Caulking is the best choice for this application.
This will give you say a perfect 3 8 caulk line with an irregular wall to counter gap. Fill gaps up to 1 4 inch in width with caulk. You can try and maybe nothing will happen but if it cracks you will have to dig it out. Any gap should never be greater than 1 8 inch.
If you have tile on the wall adjoining the tub select a caulk that matches the color of the grout. When you install ceramic tile on the floor you must take care to create an expansion joint between the walls and the tiled floor. Get photos of great finish details include photos with bid and contract. The large format 18 inch tiles should have inch space in between.
Tile stores generally sell caulks that match the grout. The line will continue maintaining caulk gap regardless of the gap of the wall to counter. Therefore the spacing is predetermined and usually averages 3 16 to 1 4 inch. Four inch tiles called 4 and a quarter in the tile trade feature built in self fitting nubs that give the tiles spacing between 1 16 and 1 8 inch wide.
For smaller tiles is advisable to use small spacers. Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.