As long as that vinyl floor is adhered well to the slab not peeling up anywhere then you can install your tile right on top of it.
Installing vinyl tile on rough concrete.
The low spots need to be filled in with a mix of fresh concrete before installing flooring on uneven subfloor.
Another option is to install a vinyl underlayment.
Repair any holes or cracks.
Use this home depot guide how to install a tile floor for more information.
So technically if you are installing vinyl plank flooring onto concrete you already have a subfloor.
Repair any holes or cracks.
Any minor bumps can be removed with a masonry chisel and small sledgehammer.
Vinyl tile can be installed over concrete if the concrete is clean smooth and dry.
The concrete floor must also be free of cracks or the vinyl tile will eventually sag into the gap.
You can lower high spots with a grinder.
Now if your house is on a concrete slab and you have a vinyl floor.
However some people prefer to add another thin layer of subflooring between the concrete and vinyl.
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This will allow you to lay lvt over all sorts of surfaces.
To prepare a concrete subfloor for installing tile you ll need to do a different kind of preparation.
This additional layer can improve insulation and should make your vinyl plank flooring warmer and less resonant.
Also consider that doors cabinets and other hardware might need to be reworked or replaced with new ones to compensate for the higher floor.
Plywood particleboard osb ceramic tile sheet vinyl or painted cement.
Level these off to create a smooth and flat area that are even with the surrounding hills.
Buy the product recommended by the tile manufacturer.
If your wooden subfloor is in really rough shape install 1 4 in.
Tile leveling systems can help keep your tiles level aligned properly spaced and held in place while the tile mortar cures.
Plywood underlayment over it.
Used correctly tile leveling systems.
Allow it to dry apply your grout just like you would on any other type of tile installation.
You can sometimes lower high spots using a coarse grit abrasive on a belt or disc sander.
Use a thin set product to install ceramic tile over existing tiles.
Lay a 2x4 board down when the concrete has dried to ensure you have addressed all of the issues.
Any minor bumps can be removed with a cold chisel driven by a baby sledge hammer.
When it comes to mortar latex or epoxy options are best for installing tile over tile.