The patient is a shower stall, acrylic base, cement backer board, 8x10 tiles in thinset. The tiles overlap the lip of the acrylic base by
1/2"(?) and there is a 1/4" gap between the bottom row of tiles and the flat top of the base. I went to start grouting, and noticed that the gap behind the bottom of the tiles isn't always filled with thinset.Is it necessary/desirable to try to push thinset/grout under the bottom tiles and into the gap behind? Should I just squeeze extra caulk up into the gap? Caulk seems easier, but won't support the bottom bit of the tile as well.
Any advice appreciated.
Red