The floor is a 4 inch poured concrete slab over an unheated utility room.
Tile over painted cement floor.
Concrete provides one of the most stable working platforms in the world and is the preferred foundation layer for a ceramic or porcelain tile.
All you need to do is create a clean smooth surface to which the paint can adhere.
Paint used on concrete will not bond with the tile adhesive.
Painting over a concrete floor that has glue on it can present some issues.
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.
How to lay porcelain tile over a concrete floor.
It must be easy to work with and it must adequately fill in gaps between the tile and the substrate.
Otherwise you do.
Unfortunately the tile cannot be adhered directly to the painted surface.
Tile adhesive is expected to hold the tile in place not just for years but for decades without fail.
You should either strip or bead blast the concrete and thoroughly clean it.
Cracks and gaps can be filled with portland cement based fillers.
If you discovered any defects on the floor fill them with a concrete patch or self leveling compound to achieve a flat surface that s ready to receive ceramic tiles.
It cannot cure too fast.
If you re going to install tiles in wet areas such as bathrooms and balconies you need to apply a waterproofing membrane or paint first.
Removing the glue completely using an adhesive remover would be the best way to proceed but if removal isn t possible you can still paint a concrete surface covered in glue.
Ceramic tiles will not adhere to an enamel painted floor because the surface is too smooth.
If the paint comes loose so does the tile.
Installing tile over painted concrete adds a few extra steps to your tiling job.
Sheets of cement backing available from most do it yourself.
Whether wall or floor tile that tile needs to thoroughly stick to its base surface demands placed on tile adhesive are both extensive and steep.
Water should readily absorb in the concrete as an indication that it.
But there is a solution to the problem.
All paint will need to be removed before you begin installing the tile.