Photos attached hopefully i think they re upside down but what you re looking at is the corner where the tiling is on one wall and that wall meets a plastered wall and a plastered ceiling.
Gap between wall tile and ceiling.
Caulking is the best choice for this application.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
Although the covering on most ceilings is drywall that isn t the only material that builders use.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
There is a slight gap between the tiles on the wall and the ceiling.
In all cases covering the seams between.
We had to replace the drywall ceiling above the shower which was buckling and wavey.
You can then proceed with normal joint taping techniques using drywall joint compound which drywall professionals refer to as mud.
The only place that the gap gets any larger is on the one outside wall.
When i put the inside the shower last tile on there was only 1 16 to 1 8th inch gap.
Alan the floor of your shower looks great but it agree that there seems to be too much of a gap between the wall tiles.
The tile is level the ceiling is not.
Never fill this gap with grout because tile grout is not flexible.
Maybe it will look better once it s grouted but right now my eye focuses on the gaps and not the beautiful stone.
All it takes is a quick patching job with fiberglass mesh tape.
So now there is a varying gap 0 to 1 4 between the top of the tiled wall and the ceiling.
When the ceiling changes height across the length of a wall a gap between wall and ceiling can result.