Laying ceramic on top of peel and stick tiles

I have a townhouse with a entrance way thats 11x6 feet. The flooring is currently peel and stick tiles. The peel and stick tiles are stuck on to the concrete flooring. These tiles are in perfect shape and stuck on VERY well. I was wondering if I should try to remove them and fight all of the adhesive glue or should I simply sand the tiles to make them rough and then tile right on top of them. Can someone help? I did have a contractor come and give a estimate but he recommended going right over the tiles... and now I'm actually going to do the job myself

HELP
HELP

= Steve =

 

on concrete and the tile are stuck good might be worth the risk.the problem would be the moisture from the thinset getting down to the glue and nutralizing the glue but not too risky here go ahead and tile it

 

If it were my house the tile would be coming off..........no exeptions.....scrape,scrape,scrape.......clean, clean,clean...then find yourself a premium latex mortar, one that states is ok for glue residue.........

 

I second that!
Off with the tile.

I would want my mortar stuck to the concrete. Not a tile that has adhesives that could crystalize, and loosen later. Causing my ceramic tile to fail.