No Demolition
Existing tile stays put
2 to 3 mm
Added thickness
5 Days
Typical bathroom on site
Mesh
Bridges every grout line
The Process for Applying Microcement Over Tiles
Yes. Microcement can be applied directly over existing tiles, provided they are sound and well bonded. The tiles are cleaned, primed with a bonding primer, then coated with a mesh reinforced base that bridges the grout lines, followed by finish coats and sealer.
Microcement is applied at roughly 2 to 3 mm and bonds to the surface beneath it. A tiled wall or floor is already flat, rigid, well fixed and non absorbent, which is close to an ideal substrate. The only real obstacle is the grout lines, and those are dealt with in preparation.
The alternative is demolition: jackhammers, dust through the whole house, a skip on the verge, damaged substrates to make good, and a bathroom out of action for weeks. Going over the top removes most of that.
Step by step
- Assessment: Every tile is checked for drummy or loose sections. Any that move are removed and made good. Nothing is coated over a tile that is not firmly fixed.
- Clean and degrease: Soap film, cleaning residue and body oils all break adhesion, so surfaces are washed back thoroughly.
- Prime: A bonding primer keyed to non absorbent surfaces, detailed in the next section.
- Base coats with mesh: A fibreglass mesh is bedded into the first coats across the full area, bridging the grout lines so the tile pattern cannot telegraph through.
- Finish coats and seal: Two thin layers trowelled to the chosen texture, with edges and corners run continuously, then multiple sealer coats.
Microcement is a finish, not a waterproofing system. The membrane behind the tile is what keeps water out, and it has to be sound.
So when people ask can you micro cement over tiles in a shower, the answer depends on what is behind the tile rather than the tile itself. If the existing waterproof membrane is intact and compliant, the shower can be recoated. If the membrane has failed or its condition is unknown, that has to be resolved first.
Surface Preparation and Priming Requirements
Tiles are glazed, which means they are designed to shed water and resist adhesion. That is precisely the property a coating has to overcome, so priming is not a formality here.
Mechanical Key
Depending on the glaze, the surface may be abraded to give the primer something physical to grip.
Bonding Primer
A quartz loaded primer specified for non absorbent substrates. Standard plaster primers will not hold on glazed tile.
Grout Line Management
Deep or wide lines are filled and levelled first. With the mesh in the base coats, this is what prevents ghosting months later.
Substrate movement is the other check. Wall tiles on masonry are stable. Floor tiles over a timber substrate that flexes underfoot are not, and need addressing before any coating goes down. We assess this on site and will say plainly if a floor is not suited.
Benefits: Saving Time and Money on Tile Removal
01
No Demolition
No jackhammers, no skip bin, no dust through the house, and no risk of damaging the substrate or membrane on the way out.
02
Shorter Timeline
A tile out and retile renovation typically takes two to three weeks across several trades. Coating over is around five days with one team.
03
Lower Total Cost
Demolition, waste removal, substrate repair and re waterproofing all leave the scope, so the project total is frequently lower.
04
Better in Small Rooms
No grout lines and no tile edges means nothing to break the space up, discolour, or grow mould in a corner.
There is also less waste, since the existing tile stays where it is rather than going to landfill.
Can you micro cement over tiles and expect it to last? On sound tile, over an intact membrane, with correct priming and mesh, yes. The failures we are called to inspect trace back to skipped preparation almost without exception, not to the method itself.
If you are weighing this up for an Adelaide renovation, our microcement bathroom page covers wet area work in detail, and the microcement services page sets out the systems and finishes we apply.
Frequently Asked Questions
Common questions about applying microcement over tiles, answered by our in-house team.
Can you micro cement over tiles in a shower?
Yes, provided the waterproof membrane behind the existing tile is intact and compliant. Microcement is the finished surface rather than the waterproofing, so a suspect membrane must be resolved first and never simply coated over.
Can microcement go over floor tiles as well as walls?
Yes, provided the floor is rigid and the tiles are well bonded. Floors over flexing timber substrates need assessment first, since movement underneath is the main cause of failure in a thin coating.
Will the grout lines show through?
Not when the work is done correctly. Grout lines are filled and levelled, and a fibreglass mesh is bedded into the base coats across the whole area. Ghosting on other jobs is almost always a sign one of those steps was skipped.
How soon can the bathroom be used?
Light use is generally possible a couple of days after the final sealer coat, with full cure taking longer. We provide a care card setting out the timeline and the cleaning products to avoid.
