So, I have two issues. Both related to the same solution. One shower keeps breaking the silicone seal and then letting water through. The other shower has standing water against the silicone and I'm worries that if this seal breaks it will leak severely.
The tray is up as close to the tiles (3mm) I can get in one case, but pretty gappy in the other tray 3mm-10mm gap.
So, I'm looking for what is the best way to double belt and brace this seal? is there some industrial strength stuff I can use, or could (should) I use expanding foam or grout in the gap before silicone?