Having read the FAQ and previous posts on tiling, can I just clarify
something? I realise that due to a cement/plaster chemical reaction it is
inadvisable to use a cement-based adhesive for tiling over plasterboard. But
what about the grout? It seems that people recommend a cement based
rout - so can this be used when the tiles are mounted on plasterboard?

Also, if anyone has any recommendations for a good quality waterproof grout
for a shower, I'd be grateful.

thanks

Paul

I used Bal Grout and the Bal additive comes in a litre pot just add to your
water ,tiles on to hardibacker board in shower and plasterboard in the rest
of the room.workability was good grout a little gritty for my liking but,so
cover up shower well before tyou start.