This is something that I wouldn't do. I would not put a ceramic tile floor over and existing vinyl floor. My situation is this: I have two layers of flooring. The first is that
50 year old stuff (I think it was onece called corelon) and over that I have crappy Armstrong Solerian that has become useless. It is 25 years old and quite worn; can't keep it clean anymore.My wife wants ceramic tile. How do I get up both layers? The second layer is glued down only at the edges because I watch the guy pu it down. He insisted that was all you needed. He was wrong. It lifted in several areas.
I'm not sure how good the fist layer is but I do know that the subflooring is some sort of tngu and groove fir (or maybe oak) so I will at least need to put down plywood.