Microcement Bathroom Guide: Waterproofing, Tiles, Floors and Cost

A microcement bathroom is a bathroom with no tiles and no grout: one continuous, seamless surface across the floor, the walls and often the shower tray itself. Microcement, also written micro cement, is a thin cement-and-polymer coating, applied by trowel a few millimetres thick, that bonds to almost any sound substrate including existing tiles. It is not waterproof on its own. The sealer on top does that job, which is why the quality of the sealing matters more than anything else in a micro cement bathroom. This guide covers going over tiles, floors, showers and baths, cost relative to tiling, maintenance, when Tadelakt is the better choice, and hiring someone who will get it right.

What microcement actually is

Microcement is a blend of fine cement, polymer resins, aggregates and pigment. It goes on in two or three thin coats over a primer and a mesh, sanded between coats, and is finished with a sealer system, usually a two-part polyurethane. The build-up is a few millimetres, so it clears door thresholds and sanitaryware.

The look is a soft, cloudy, hand-finished surface with subtle movement. People searching for a concrete bathroom or a micro concrete bathroom usually mean this: it is often compared to polished concrete, but it is warmer underfoot, far thinner, and can be tinted to almost any colour. Microcement bathroom colours run from chalk white through greige and putty to charcoal, and mid-tones hide water marks best. We cover the broader comparison in microcement versus tiles.

Why bathrooms suit it

Three reasons make microcement for bathroom work such a good fit. First, no grout lines. Grout is where bathrooms go wrong: it stains, it harbours mould, and it is the part you end up scrubbing. Second, it wraps. Microcement goes over floors, walls, shower trays, bath panels and vanity tops, so a small bathroom reads as one calm space. Third, it goes over what is there, which means less demolition, less dust and a shorter programme.

Is microcement waterproof?

This is the question that matters, and the honest answer is: the microcement itself is water-resistant, and the sealer makes the system waterproof. An unsealed surface will absorb water, stain and eventually break down. A properly sealed one, with the right number of sealer coats and the right cure time before use, will take a daily shower for years.

So when you are comparing installers, ask about the sealer, not the cement. How many coats? Which system? How long before the shower can be used? A good installer will have firm answers.

Two more points. Wet areas still need tanking underneath: microcement is the finish, not the membrane. And junctions, where floor meets wall or tray meets screen, need proper detailing. Most failures we see are at a junction or a rushed sealer.

Microcement over tiles

Yes, and it is one of the best uses of the material. Existing tiles are cleaned, degreased and keyed, an adhesion primer goes on, the grout lines are filled, and the microcement is built up over the top. You keep the tanking and drainage, avoid a skip of rubble, and the bathroom is out of action for days rather than weeks.

The conditions: the tiles must be sound and well bonded. Hollow or loose tiles come off and the void is filled first. Deep grout joints need an extra fill coat or they will ghost through.

Floors and shower trays

Bathroom floors are where microcement really earns its place. It is warm underfoot, works over underfloor heating, and a lightly textured sealer gives grip when wet. Ask for anti-slip in the shower and a smoother surface on the main floor.

A microcement shower tray can be formed over a pre-formed wet-room tray or a screeded fall to a linear drain. The finish runs straight from the bathroom floor into the shower with no step and no lip. The fall to the drain has to be right before any microcement goes down; the coating is too thin to correct it afterwards. A microcement bathtub is possible too, over a built-in bath surround or a boxed-in panel, and is treated exactly like a shower: tanked, sealed, detailed at every junction.

Walls

Microcement walls are the easiest part. Over plasterboard, cement board or existing tiles the material behaves well, and outside the shower stream the sealer has an easy life. Inside the shower, the same rules apply as the floor: full sealer system, detailed corners and a silicone bead where the microcement meets glass or trays.

Cost relative to tiling

We will not put numbers on it, because every bathroom is different and prices move. What we can say is where microcement sits on the scale. Against budget ceramic tiles fitted by a general tiler, it is more expensive: it is a skilled, multi-day, multi-coat process. Against large-format porcelain, natural stone or a decent wet-room tile installation with its tanking, cutting and grouting, it is usually comparable and sometimes cheaper, especially over existing tiles where it saves the strip-out. The saving people miss is time: a retile runs a week or two, a microcement overlay is usually days.

Maintenance

Day to day, microcement is easier than tiles. Warm water and a neutral, pH-balanced cleaner. No bleach, no acidic limescale removers, no abrasive pads: these attack the sealer, and the sealer is the whole point. Use a squeegee on shower walls in a hard-water area. Scratches and chips are rare and can be spot repaired, though they will show slightly, as in any hand-finished surface.

When Tadelakt is the better choice

Microcement is a modern material with a resin sealer. Tadelakt is a lime plaster, polished with a stone and sealed with olive soap, used in Moroccan hammams for centuries. It is water-repellent through the soap reaction rather than a coating, it is breathable, and it has a soft, hand-polished depth that microcement cannot copy.

Choose Tadelakt for a period house, a lime finish that breathes, a soft organic look rather than concrete-flat, or when a polyurethane sealer bothers you. Choose microcement for a floor that takes hard daily use, for going over tiles, or for the crispest seamless look. We go deeper in Tadelakt bathrooms.

There is a third option: Pastellone, a traditional Italian lime floor plaster that gives a continuous surface across floors and walls. It suits bathroom walls and floors outside the wet zone, and pairs well with Tadelakt inside the shower.

Hiring an installer

Microcement is unforgiving of shortcuts, which is why we steer homeowners away from a microcement kit for a wet room; a kit is fine for a practice board, not a shower. Ask an installer which system, how many coats, how it is sealed, what the cure time is, what happens at the junctions, and whether you can see a bathroom they did more than a year ago. Look for someone who talks about substrate preparation and tanking before they talk about colour.

Our installation team does microcement and Tadelakt bathrooms across the UK from Birmingham. To learn the wider family of seamless finishes, start at the Academy.

Questions we get asked

Is microcement waterproof?

The cement itself is water-resistant; the sealer system on top makes it waterproof. A properly sealed and cured surface takes a daily shower for years. Wet areas still need tanking underneath, as they would with tiles.

Is microcement cheaper than tiles?

Often, once you count tanking, cutting and grouting on a porcelain, stone or wet-room tile job, and especially over existing tiles where it saves the strip-out. Dearer than budget ceramics fitted by a general tiler. Not cheap, but rarely the expensive option people assume.

Can you microcement over tiles?

Yes. Sound, well-bonded tiles are cleaned, keyed and primed, the grout lines are filled, and the coats go over the top. Loose or hollow tiles must come off first.

How long does microcement last?

With the right substrate and sealer, well beyond a decade of daily use before the sealer needs refreshing, and the refresh is a light job rather than a replacement. It is the same story as tiles: the surface outlives the fashion.

Can you tile over microcement?

Yes, if you change your mind later. The sealed surface is keyed or primed with an adhesion primer and tiled as you would over any sound, flat substrate. Microcement can also be used outside on terraces and walls, but it needs an exterior-grade system and an installer who has done it.

Where to go next: talk to our installation team about microcement or Tadelakt for your bathroom, or order a Tadelakt tub if you are a plasterer ready to try the lime alternative.