Microcement Finish — Seamless, No Demolition

Microcement — also sold as microtopping or micro-concrete — is a polymer-modified cement coating trowelled on in layers only two to three millimetres thick. That thinness is the whole point: it bonds onto an existing floor, wall, stair or counter without demolition, and without the height and weight of a poured concrete topping.

There are no joints and no grout lines. A bathroom, a floor or a feature wall reads as one continuous surface, which is why it has become the finish of choice for modern GTA renovations and custom builds. Colour is through the material and the texture is set by hand on site, so no two installations are identical.

It is the same family of materials we have worked with for 25+ years on exteriors — cementitious systems that live or die by substrate preparation. The difference is that here the surface is the finished product, so the preparation has to be even more exact.

1. Substrate preparation. The existing surface is checked for soundness, movement and moisture. Tile is degreased and abraded, gloss is removed, loose material comes off, and any hollow or damaged areas are made good. On floors, deflection is checked before anything else — a moving substrate is the one problem microcement cannot solve.

2. Primer keyed to that substrate. A different primer is used for absorbent surfaces such as screed and drywall than for non-absorbent ones such as glazed tile. This is the single most common corner cut, and the reason coatings later peel in sheets.

3. Base coats with reinforcing mesh. Two base coats go on with a fibreglass mesh embedded between them, lapped at corners and over any joint. The mesh distributes small movement across the surface instead of letting it become a crack.

4. Two finish coats. The colour and texture layers, trowelled by hand. Every pass affects the final look, so one person finishes a whole area — textures cannot be reliably matched between installers.

5. Sealing. Two to three coats of a penetrating and topcoat sealer system, chosen for the room: higher chemical and water resistance in a shower or kitchen, higher abrasion resistance on a floor, UV-stable outdoors. Matte, satin or gloss is your choice at this stage.

Timeline. A typical bathroom or mid-sized floor takes three to five working days including cure time between coats. Light foot traffic is usually possible the day after sealing; furniture, mats and full wet use wait roughly seven days for the sealer to reach full cure.

Day to day it is easy: sweep or vacuum, then clean with a pH-neutral cleaner and a damp mop or cloth. What shortens its life is the wrong product — avoid bleach, ammonia, descalers, acidic bathroom cleaners and abrasive pads, all of which attack the sealer rather than the cement underneath.

In showers, squeegee the walls and let the room ventilate, exactly as you would with natural stone. On floors, felt pads under furniture and a mat at the entry prevent the grit that dulls a sealer over time.

The sealer is the wear layer, not the microcement. On a busy floor it is worth refreshing the topcoat every few years, which is a light job and restores the original finish. Walls and low-traffic areas generally need nothing beyond normal cleaning.