The tile installer is right. Even though nothing may happen, nobody has a crystal ball and the track record of tile over painted floors is not great so he is basing his decision on historical data.
You could do two things.
1. Check around for some membranes that could be put over the paint. I dont know of any offhand but maybe Noble Company or Schluter which makes Ditra. The tile could then be set to the membrane with thinset.
2.Grind the paint off. Some of the more industrial type rental ceneters will rent you a machine that looks like a floor buffing machine. They will sell you the bricks that mount to the underside and grind away everything, plus make the floor more even by removing any high spots. A shop vac hooks up to the outflow port to gather the unbelievable amount of dust that it will create. |
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