You know at some point we all learnt the hard way we were'nt all tilers who knew everything from the minute we learned to lay a tile ,i agree so called tilers shouldnt be asking advice on a job they cant do or have no knowledge on what should and should not be tiled.
The point i was trying to make was ,how did you guys learn? you either asked or you watched someone deal with a similar problem,i mean i have been in the tiling game for getting on 25 yrs and have only had to deal with a handful of quotes for floating floors and the first one was only around 10 yrs ago,so from my point of view someone can go years and years without this cropping up,so why cant they ask on a Tile forum for help without being belittled or made to feel like an idiot,seems to me that a few guys let that trusted advisor tag go to their heads, if you dont want to help then dont post negative stuff it serves no purpose.