I thought on this subject more last night and the idea of tiling ceramic over ceramic is too scary and unsound.
Vinyl can be done this way all the time, if the vinyl and floor is level. But ceramic with its slick surfaces and probably without floor levelor applied will just not adhere properly.
I will have to recant my previous statement and go completely with Jim.
I hope that you have not paid this contractor for the job. Jim statement about coming loose in 18 months describes most accurately the probable scenerio.
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