There should be a small gap between the backerboard and the tub.
Gap between tile wall and tub.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
Apply it to the wall with the bottom edge about 1 4 in.
If you ve got a gap of 1 2 inch or less after you tighten the spout as far as it will go the best way to erase it is to fill it with silicone caulk.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
Since you are joining two different materials together you should use caulk in the space where the floor tile and tub meet.
Plus the designer originally had shoe molding around all the baseboard.
Caulking is the best choice for this application.
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 the gap between the tile and the tub with caulk.
This gap may widen over time as your home shifts.
If you have tile on the wall adjoining the tub select a caulk that matches the color of the grout.
Choose white caulk or one that matches the wall.
Probably the simplest way is to caulk the gap with 100 silicone or a urethane sealant.
I found out that there is a gap between the tile and tub that would be too big for caulk.
Above the lip of the tub.
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.
First you would waterproof with your favorite liquid waterproofing membrane of choice.
The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area.
In these photos i used a hydro ban.
It s one of those things where in the grand scheme of things it isn t worth a battle especially since the way the designer laid out the tiles in the design there would have been a gap.
If your gap is smaller than 1 8 inch in width use regular caulk.
Fill gaps larger than 1 8 inch.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
Check if you need to adjust this mark to avoid laying slivers of tile at the top and bottom.
Webb chappell to tile around a tub or shower start by measuring the height of the back wall from the lip of the tub to the top of the area to be tiled.
When you install ceramic tile on the floor you must take care to create an expansion joint between the walls and the tiled floor.