The short answer
Yes, microcement can often be considered over tiles, but the tiles become part of the substrate. Their condition, bond and movement therefore matter to every layer installed above them.
The useful question is not simply whether microcement sticks to tile. It is whether the complete tiled build-up is stable, correctly prepared and appropriate for the intended use. A decorative coating cannot repair a failed substrate below it.
What should be checked first
The assessment starts with the existing surface. Loose or drummy tiles, cracked areas, contaminated surfaces, movement at joints and changes between substrates can all affect the proposed system. In a wet area, the condition and compliance of the waterproofing also need separate consideration.
The final specification depends on the application, exposure and current construction. A wall, floor, splashback and shower zone do not present the same loading or moisture conditions.
- Whether tiles are securely bonded and free from active failure
- Whether cracks or movement are present and what is causing them
- Whether grout lines and transitions require levelling or reinforcement
- Whether coatings, oils, soap residue or other contaminants are present
- Whether the wet-area assembly and falls are already suitable
Preparation is a system, not one primer
A typical preparation path may include thorough cleaning, mechanical abrasion, a compatible bonding primer, treatment of joints and transitions, reinforcement where specified, and base layers that create a suitable working surface. The exact products and sequence should match the substrate and the selected microcement system.
Skipping those decisions can leave the decorative finish dependent on an unknown layer below. That is why responsible planning starts with evidence about the existing surface rather than a promise based only on the word ‘tile’.
Bathrooms need one extra distinction
Microcement can be used as a decorative finish within an appropriately designed wet-area system. It is not automatically the legally required waterproofing membrane. The substrate, membrane, preparation products, decorative coats and protection need to be compatible as a complete build-up.
If existing tiles are being retained in a bathroom, the proposed work should not assume that the concealed waterproofing is compliant simply because the visible tiles appear intact.
What to send for an initial review
Useful information includes the room or application, project location, approximate area, clear photographs, tile condition, any known cracking or movement, and whether the surface is in a wet or exterior-exposed area. That allows the conversation to begin with the actual substrate rather than a generic coating answer.