Use spacers for accuracy.
How to lay ceramic tile on painted concrete floor.
You should either strip or bead blast the concrete and thoroughly clean it.
Now that you have a reference point you can be sure that the first row of tiles will be properly aligned.
Begin adhering your first two rows of tile.
Use a thin coat of tile adhesive on the back of each tile.
Spread another 2 feet by 2 feet layer of tile adhesive beside the first and lay tiles on it in the same way.
Test how it will look like by laying the tile without adhesive.
Use a chalk line to mark your starting point on the concrete floor.
Answer answer it is possible to bond porcelain tile to a painted surface but it isn t recommended because the overall tile attachment is limited to the strength of the bond of the paint to the concrete.
Continue until all the full tiles have been laid.
Once the tiles are in place use a rubber hammer to set the tiles firmly into the adhesive.
If the paint comes loose so does the tile.
Wipe up any glue that seeps up between tiles.