J
jubba
Hi Carole, the internal corners should not be filled with grout. The gap is filled with flexible silicone, so that it does not crack due to heat expansion. If it is filled with grout it will crack, it is not the way it should be done.
All makes sense about using silicone in the corners.
So when you fix the tiles should a deliberate gap be left (use spacers) in the corner rather then butting the tiles together?