The caulk between my bathtub and the wall tiling above it has dried out, so I’m removing and redoing it. I’m a bit surprised to see that behind the caulk there is no grout, but when I look online, the argument is that the caulk is flexible and the grout is not, so as the wall moves, it’s better to have caulk to keep it filled.
So the caulk has dried out and left a gap anyways. And who knows how long ago it was done, but I feel like the movement/settling has probably happened already. Any reason not to grout between the tub and the tile and then caulk along the seam??
The hole is quite deep btw… some places 1/4", but some places 1/2"
Complicating this is that there is a piece of thin plastic like saran wrap along this seam.
even with a shower caulk is supposed to be used at all change of planes even if it’s tile to tile - this is because there is movement and caulk is flexible, so you don’t want grout there at all. I would assume same concept between tub and tile.