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.
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.
Although the covering on most ceilings is drywall that isn t the only material that builders use.
We had to replace the drywall ceiling above the shower which was buckling and wavey.
So now there is a varying gap 0 to 1 4 between the top of the tiled wall and the ceiling.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
The previous owner had recently re tiled the shower from the tub to the previous ceiling.
The only place that the gap gets any larger is on the one outside wall.
Never fill this gap with grout because tile grout is not flexible.
You can then proceed with normal joint taping techniques using drywall joint compound which drywall professionals refer to as mud.
In all cases covering the seams between.
When the ceiling changes height across the length of a wall a gap between wall and ceiling can result.
All it takes is a quick patching job with fiberglass mesh tape.
Covering this gap isn t a difficult process.
The tile is level the ceiling is not.
Maybe it will look better once it s grouted but right now my eye focuses on the gaps and not the beautiful stone.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.