You need to prepare by removing the paint and scarifying the surface to open up the pores of the concrete.
Can you install tile over painted concrete floor.
Before you lay any sort of tile whether it is stone ceramic or peel and stick vinyl you must prepare your concrete floor to ensure that the tiles will go down properly and stay where they re.
Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint.
As long as there are not structural cracks in the concrete floor you can install porcelain tile over it.
Sand or scuff it up well and wash to get.
No big deal hack or grind the epoxy coated surface to form keys and tile over.
The tile installer is right.
All paint will need to be removed before you begin installing the tile.
As long as the paint is down well and not flaking you can go over it with some preparation.
You want water to readily absorb into it.
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.
Ceramic tiles will not adhere to an enamel painted floor because the surface is too smooth.
Installing tile over painted concrete adds a few extra steps to your tiling job.
Sheets of cement backing available from most do it yourself.
Unfortunately the tile cannot be adhered directly to the painted surface.
But there is a solution to the problem.
While you can install tile directly on concrete problems erupt when the concrete cracks or shifts.
However you should remember this one instruction no.
If you use a stripper to remove the paint be sure to flush it thoroughly to remove any residuals.
Paint used on concrete will not bond with the tile adhesive.