Will grout for ceramic stick if concrete is painted?

Questions & Answers › Category: Painting Interior Brick and Tile › Will grout for ceramic stick if concrete is painted?
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Terry asked 10 years ago

I have a painted basement floor and want to put ceramic tile over top of it.

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Crowder Painting answered.

Although I'm not a tile installer, I think you will have some problems with both the mastic glue and grout sticking to a painted concrete floor. Adhesion problems will be worse with glossy hard epoxy.

At the very least the floor should be roughened with 36 grit or coarser sand paper. Visit your local tile dealer or talk to a tile installer about additional preparation steps before installing your tile. A special glue could be available that will address this problem.