The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete.
Tile over painted concrete basement floor.
Then prime the concrete see photo 2 with the recommended solution consult the membrane manufacturer s literature.
Unfortunately the tile cannot be adhered directly to the painted surface.
The house was built in the late fifties and the slab floor has been painted at least once.
Cracks and gaps can be filled with portland cement based fillers.
Concrete provides one of the most stable working platforms in the world and is the preferred foundation layer for a ceramic or porcelain tile.
Doing the prep work before you repaint a concrete floor avoids a peeling paint job later.
Paint used on concrete will not bond with the tile adhesive.
Installing tile over painted concrete adds a few extra steps to your tiling job.
How to repaint concrete floors.
Laminates should always be installed over subfloor tiles and the best subfloor systems accept leveling shims so you can create a stable wobble free installation surface.
The floor is a 4 inch poured concrete slab over an unheated utility room.
Skip this step and we guarantee your new tile will crack right over the cracks in the concrete.
Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint.
Many basement flooring materials like paint epoxy tile and rubber flooring for example can go down directly over the basement s original poured concrete floor as long as the concrete is in good condition.
Let the primer dry and then apply the membrane photos 3 and 4.
How to lay porcelain tile over a 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.
And while many concrete basement floors are not this flat it is possible to use floor leveling compound to correct major issues.
Water should readily absorb in the concrete as an indication that it.
This kind of damage should be repaired before any new basement flooring is installed.
If the paint comes loose so does the tile.
All paint will need to be removed before you begin installing the tile.