I seem to find a lot of different opinions on fixing walk-in shower trays to floors. I will be fixing to a marine ply base screwed into joists with noggins. The manufacturer says bed into a weak mortar mix, but I read that this can lead to problems when the mortar dries out. Some say silicon, some say low expansion foam, some say tile adhesive, some say mortar.
What is the definitive way to fix a shower tray?
What is the definitive way to fix a shower tray?