Can you put microcement on wood and plywood?

Yes, you can put microcement on wood and plywood. It has to be the Reinforced system — primer, fiberglass mesh, build coat, microcement, sealer. Not Core. Not ever Core.

The reason is one sentence long: wood moves, and movement is exactly what the mesh and build coat exist to handle.

That is the whole answer. The rest of this is about whether your particular wood floor is stiff enough to be worth microcementing at all, because that is the question that actually decides how the job turns out.

Why wood is automatically Reinforced

The Core system covers three things: interior walls, bare concrete floors and indoor fireplaces. That list is closed. A plywood subfloor is not a bare concrete floor, floorboards are not a bare concrete floor, and a wood-framed platform is not an interior wall in the sense Core means.

So there is no judgement call to make here. Any floor that is not bare concrete is Reinforced. Wood is not bare concrete. Done.

It is worth understanding why rather than just taking it, because the same logic tells you when a wood floor is a bad candidate even for Reinforced.

Microcement goes down thin and sets hard. It does not bend and it does not stretch. Wood does both — it flexes under load, and it moves with the seasons as the moisture in it changes. Two materials with opposite habits, bonded together, and the hard one loses. Without something to absorb that difference, you get cracks, and they run exactly where the wood wanted to move: along a board joint, along a ply seam, across a spot that flexes underfoot.

What the mesh and build coat actually do

The Reinforced system puts two extra layers between the primer and the microcement, and they work together.

Fiberglass mesh is fastened down over the primed surface with staples or a glue gun, then pulled tight — all slack out, all wrinkles out. One roll covers 500 sq ft.

Then the build coat is troweled into the mesh, so the mesh ends up buried in it rather than sitting under it. That is the point. A sheet of mesh lying loose does nothing. Mesh bedded in a structural build coat spreads small movement sideways across the whole surface instead of letting it concentrate into one line — which is how a crack starts.

The build coat is two coats, Part A mixed with Part B, measured accurately and mixed fully. Sand is broadcast into the first while it is wet for a mechanical key. Coverage is 275 sq ft on the first coat and 310 on the second, and it needs a 12-hour cure after the second coat before the microcement goes on.

Pull the mesh tight when you fasten it. A wrinkle in the mesh becomes a ridge in the build coat, and a ridge in the build coat is a ridge you will see in the finished floor.

The real question: is the floor bouncy?

Here is the part that matters more than anything about the product. Reinforced handles the small, ordinary movement of a sound wood floor. It does not turn a springy floor into a solid one.

So before you buy anything, go and walk on the floor. Properly — heel down, across the middle of the span, not near the walls where everything feels solid.

• Does it deflect under your weight? If you can feel the floor give as you cross it, that movement is still there after seven coats of microcement.
• Does anything creak or click? A creak is two pieces of the floor moving against each other. That is movement with a location, which is where a crack will choose to appear.
• Do boards or sheets move independently? Stand on the edge of one and watch its neighbour. If one moves and the other does not, you have a working joint.
• Is anything loose, lifting, cupped or hollow-sounding? Loose fixings, lifting edges and delaminated ply all have to be dealt with before primer.
• Is it dry, and dry for a reason you understand? Wood near a leak, or wood that has been wet and dried out, is not a substrate you prime over and hope.

If the floor fails on any of that, fix the floor first — refix it, stiffen it, replace what is damaged. How you do that is a structural question about your building, and it is worth getting right on its own terms. What we can tell you plainly is that no coating system fixes a floor that moves. If it bounces now, it bounces under microcement.

Prep on a wood substrate

The sequence is the same as any Reinforced job, and none of it is difficult. It is just easy to skip.

• Wipe the surface clean. Make sure it is dry and sound.
• Sand or grind, then vacuum. Nothing bonds to dust.
• Primer — shake well, single part, ready to use, no mixing. Roll one even coat, uniform, no puddles or heavy spots. Broadcast kiln-dried sand while it is still wet for a mechanical bond. Cure 30 minutes to 4 hours. Coverage 600–650 sq ft per pail.
• Sand the primer, vacuum, then fasten the mesh and trowel the build coat into it.
• Sand or grind, vacuum, then microcement — stir, add color, then water until workable. Trowel in a cloud with irregular strokes, keep a wet edge, figure-8 float. Two coats, 12-hour cure.
• Sealer — light sand, vacuum, wipe with microfiber, Part A plus Part B measured accurately. Roll and back-roll, evenly, no heavy areas. Two coats, 2-hour cure.

The sealer is not optional on any job. Two coats, both systems, every time. The microcement is waterproof in itself, before the sealer goes on — the sealer is there to protect the finish, and it is always required.

Wood floors in wet rooms and bathrooms

Wet and wood together is still Reinforced, for both reasons at once: it is not bare concrete, and it gets wet.

Be honest with yourself about the water, though. The microcement being waterproof in itself is a real advantage, but it only governs the surface you laid. Water that gets past an edge, a fitting or a joint in the room reaches the wood from a direction your finish has nothing to do with. That is a detailing question about the room, not a question about the coating, and it deserves the same attention as the trowel work.

What it costs

A Reinforced kit — one each of primer, mesh, build coat, microcement and sealer — is $2,676, which is roughly $14 per square foot. Core is $1,778, roughly $8, and on wood it is not available to you at any price.

Small rooms cost far more per foot, because you cannot buy half a pail. A tight bathroom floor uses a fraction of a build coat pail and you still buy the pail. Work the quantities out with the material calculator first, and what microcement costs per square foot goes through the math properly.

On time: each coat cures in hours, not days, but Reinforced stacks seven coats with 12-hour cures in the middle of them. Realistically that is a 2–3 day job. Anyone telling you a wood floor is an afternoon has not done one.

You can buy all of this without a certification or a trade account, which is not normal — almost all microcement in the US is sold only to certified applicators. The systems page confirms which kit your job needs, and what microcement is covers the basics if this is your first look at it.

Microvella ships late 2026. Join the waitlist and we will email you the day it is ready to order.