I plan to use some floor leveling compound to smooth out the bumps in
the existing tile, not sure what's really involved with that but I'm
guessing it will make the job totally irreversible.

On Dec 21, 2:37 pm, "HeyBub" wrote:
You'll probably have to take up the old tiles and possibly do some other
work to get the floor perfectly flat. Vinyl tiles, no matter how thick, will
take on the irregularities of whatever's underneath.