I have recently removed the old vinyl tile from my basement leaving the bare concrete floor. I want to install ceramic tile but the concrete floor has several unlevel areas. There are 4 rooms in the basement. How do I level the concrete floor? How do I make sure it is level from one room to the next? Once I level the floor, what can I put between the conrete and the ceramic tile to keep the floor from being so cold? I need lot’s of help as I’m sure you can tell. Thanks in advance for any assistance you can offer.