Some shower base installation instructions specifically state that you should tile behind first and fix the base second. Unless yours says this I would install the tray and tile down to it, grout, and then seal the join with silicone sealer/mastic.
Hi - please forgive a novice what might be an obvious question, but I'm using Farrow and Ball paint on my interior woodwork & the advice sheet says that their primers should be diluted with 5-20% thinners. Can anyone tell me what thinners are? Meths, turps, white spirit or a specific product for...