Ok i was on here about a month ago saying i was going to tile over tile. Well that changed when i saw how easily the old tile came up. The sub-floor seems to be in pretty good condition but it has left some of the old thinset. I want to put down backerboard. Can i go over the old thinset or should i try sanding it off, if that will even work?
If it will what kind of thinset do you use to glue the backerboard to the floor, the flex stuff? Oh and 1 last thing do you screw or nail backer board?