How thick is microcement?
Share
Thin. Thin enough to go over what is already there — concrete, old tile, tired plaster — without rebuilding the room around it. That is the point of microcement, and it is why doors, thresholds and trim usually stay exactly where they are.
The honest answer to "how many millimetres" is that it depends on the build: which system you use, which microcement, and how hard you pull the trowel. We are not going to print a figure we cannot stand behind on a label.
What we can do is tell you how to read thickness properly — through what it lets you do, and through how far a pail goes.
Why coverage, not millimetres
Thickness in a troweled finish is not a setting you dial in. Two people working the same pail of the same product over the same floor will not land on the same film, and neither of them is doing it wrong. The first coat is doing most of the filling. The second coat is riding on top of a surface the first one already flattened.
So a single millimetre figure would be a number invented for a spec sheet rather than measured on your floor. What is printed on our labels is coverage, because coverage is the thing that is actually consistent — and coverage is thickness, told backwards.
The more square feet a pail covers, the thinner the film it is leaving. Read the numbers in that order and they tell you a lot:
- Microcement Smooth — 600 sq ft on the first coat, 725 sq ft on the second, per pail.
- Microcement Coarse — 375 sq ft first coat, 450 sq ft second.
- Build Coat — 275 sq ft first coat, 310 sq ft second.
- Primer — 600–650 sq ft per pail, one coat.
- Sealer — 650 sq ft per pail on the first coat, 750 on the second.
Notice that the second coat always goes further than the first. That is the filling job being finished. And notice the gap between Smooth and Coarse: at 600 sq ft against 375 sq ft on the first coat, Coarse is laying down noticeably more material per square foot than Smooth is. It has a larger grain and it sits thicker. That is not a fault, it is what it is for.
What thin actually buys you
Tile plus adhesive is a build-up you have to plan a room around. Microcement is not. It is applied over the surface you already have, which is why the typical microcement job is a renovation rather than a rebuild — and why "straight over old tile" is a normal thing to ask for rather than a stunt.
That does come with a rule. Anything wet, anything outdoors, and any floor that is not bare concrete — including over tile — needs the Reinforced system: primer, fiberglass mesh, build coat, microcement, sealer. Core, which is primer, microcement and sealer, is for interior walls, bare concrete floors and indoor fireplaces. Going thin over an existing floor is the whole trick, and the mesh is what makes it safe.
Doors, thresholds and trim
This is the practical consequence people actually care about. Because the finish does not raise a floor the way a tile bed does, you are usually not:
- taking doors off and trimming the bottoms
- rebuilding thresholds between rooms
- pulling baseboards and refitting them higher
- working out what happens where the new floor meets the old one
"Usually" is doing real work in that sentence. A Reinforced floor carries mesh and two build coats before the microcement even starts, so it sits higher than a Core wall does. If you have a door that already scuffs the carpet, check it before you start rather than after. But on most jobs the doors go back on and nobody touches a saw.
Core and Reinforced do not build up the same
Coat counts are the clearest way to see the difference between the two systems.
| Step | Core | Reinforced |
|---|---|---|
| Primer | 1 coat | 1 coat |
| Fiberglass mesh | — | yes |
| Build coat | — | 2 coats |
| Microcement | 2 coats | 2 coats |
| Sealer | 2 coats | 2 coats |
| Total coats | 5 | 7 |
Seven coats is more material than five, and the build coat is the thickest-laid product of the lot at 275 sq ft per pail on its first pass. So Reinforced is the thicker build. It is still thin compared with lifting a floor and tiling it again.
Seven coats also means time. Each coat cures in hours rather than days, but the build coat, the microcement and the sealer all need their cure after the second coat — 12 hours, 12 hours and 2 hours. Stack those honestly and a full Reinforced job is a 2–3 day job, not an afternoon.
Coarse sits thicker than Smooth
Coarse is the base texture coat. Large grain, natural stone look, and it can be heavily sanded so it is smooth to the touch or lightly sanded to help with non-slip. It suits high-traffic walls, floors and bathrooms, and it is normally hand-floated or troweled.
Smooth is the fine finish coat — no visible grains, a plaster effect, and it takes a lot of application styles: stucco effect, smooth over coarse, or plain. It suits walls, bathrooms and low-traffic floors.
You can run Smooth over Coarse, which is a thicker build than either on its own. If you are deciding between them, start from the room and the traffic rather than from thickness.
Thin is not the same as forgiving
The awkward part: a thin finish takes the shape of what is underneath it. It is not a leveling compound and it will not bury a problem. A hollow tile, a loose section of screed, a substrate that moves — a thin coat follows all of it.
That is why the prep steps on the labels are not optional. Primer goes on in one even coat with no puddles or heavy spots, and kiln-dried sand gets broadcast into it while wet for a mechanical bond. The mesh gets pulled tight with all slack and wrinkles removed, because a wrinkle in the mesh telegraphs through a thin finish and there is no thickness available to hide it.
And the sealer is always required — every job, both systems, two coats. The microcement is waterproof in itself, before the sealer goes on. The sealer is there to protect the finish, and it is not a step you skip.
Working out what you need
Since coverage is how thickness shows up in practice, it is also how you buy. Add the first-coat and second-coat fractions for your area, remember you cannot buy half a pail, and check the result against the material calculator before you order. If you want the money side of it, the cost per square foot article works through where the roughly $8/sq ft on Core and $14/sq ft on Reinforced come from — and why small rooms land well above both.
New to the material entirely? Start with what microcement is, then come back and pick a system.
Microvella ships late 2026. Join the waitlist and we will email you the day it is ready to order.