There is a particular quality of light that occurs when a surface becomes truly flat — not merely smooth to the hand, but geometrically planar at the scale of visible wavelengths. Light striking such a surface reflects rather than scatters, creating a mirror effect that reveals the room, the sky, or the observer in the surface itself. Achieving this quality in a cementitious material has historically been the province of terrazzo — ground and polished in situ over days of laborious mechanical processing. The Opus system achieves a comparable result through a fundamentally different approach.
The Self-Levelling Advantage
Opus is a self-levelling cementitious overlay that exploits fluid dynamics to create flat surfaces. Unlike trowel-applied coatings, where surface flatness is limited by the skill and stamina of the applicator, Opus is poured and spread across the substrate at a controlled thickness. Gravity and the material's carefully engineered viscosity conspire to produce a surface that is inherently level — free of the trowel marks, ridges, and undulations that characterise hand-applied systems.
The formulation achieves self-levelling behaviour through a precise balance of superplasticisers, which reduce the material's yield stress to near zero, and viscosity-modifying agents, which prevent segregation of the filler particles during flow. The result is a material that flows freely to fill the substrate geometry but maintains a homogeneous particle distribution as it settles — ensuring uniform hardness, colour, and polishability across the entire surface.
The Polishing Protocol
Once the Opus overlay has cured — typically after a minimum of seventy-two hours under controlled conditions — the surface is mechanically polished through a progressive series of diamond abrasive passes. This process follows the same fundamental principles used in stone polishing, but adapted for the specific hardness and mineralogy of the cementitious matrix.
The sequence typically begins with a coarse diamond (40 to 80 grit) to remove any surface imperfections and establish the initial plane. Subsequent passes increase in grit — 150, 300, 800, 1500, 3000 — each removing the scratch pattern of the previous stage and progressively reducing surface roughness. The final passes, at grits above 1500, produce the specular reflection characteristic of a polished finish.
The entire polishing sequence is performed with water as a lubricant and coolant, which prevents heat buildup in the diamond tooling and flushes the cementitious slurry generated by the abrasion process. The water also serves a diagnostic function — pooling in low spots and draining from high points, revealing the surface's true geometry to the operator.
Polishing is not a finish applied to the surface. It is the surface, revealed. Each successive diamond pass removes material to expose the dense, homogeneous interior of the cured overlay.
The Colour System
Opus achieves its colour through integral pigmentation — inorganic pigments dispersed uniformly throughout the material during mixing. This approach ensures that the colour extends through the full depth of the overlay, so that polishing does not expose unpigmented material beneath a coloured surface layer.
The colour palette ranges from warm whites and creams through medium greys to deep charcoals. Because the pigments are mineral-based, they exhibit the UV stability and lightfastness characteristic of inorganic colourants. The polished surface intensifies the perceived colour depth, creating a luminous quality that is often compared to the wet-look appearance of polished natural stone.
Suitable Applications
The Opus polished system is specified where the design intent demands a floor surface that combines the industrial authenticity of concrete with the refined finish of polished stone. Showrooms, galleries, high-end retail spaces, corporate lobbies, and luxury residential interiors are typical application environments.
The system is applied at thicknesses of three to five millimetres over prepared concrete substrates, adding minimal dead load and building height. This makes it suitable for renovation projects where existing floor levels and door clearances constrain the available thickness, as well as for new construction where the architect seeks the aesthetic of polished concrete without the cost and complexity of a full-depth poured and polished slab.
Maintenance is straightforward. The polished surface is dense and non-porous, resisting staining and permitting cleaning with pH-neutral detergents. Over time, foot traffic will produce a gradual patina — a natural evolution of the surface that many designers and owners embrace as evidence of the material's lived character. When a full restoration is desired, the surface can be re-polished to its original lustre without removal or replacement — a maintenance advantage that few other floor systems can claim.