I am going to tile my little 5x6 bathroom in the basement which is new construction and ahd some questions. What kind of sub floor should I use or do I need one? The basement is dry and has been for the past 10 years I have owned it. There is a slope to the floor as all do going towards the drain. I have read about many options but wanted everyone option. I was thinking that I could just screw 2 sheets of concrete board to the floor and mortor away again I would have to use smaller tiles beacuse of the pitch. I have seen some rubber 1/8 stick mat stuff at the local HD but at $56 bucks for some squishy stuff seems a little high. Thanks for any responce.