Reviewed for practical accuracy on 20 July 2026.
A polished concrete finish is chosen through several separate decisions: the slab and system, how much aggregate is exposed, the level of refinement or sheen, any colour treatment, and the performance required in the actual room. A photograph labelled "cream", "salt and pepper" or "high gloss" does not define a complete specification.
Start with the existing concrete. Its placement, flatness, hardness, aggregate distribution, cracks, repairs, joints, contaminants and previous finishes can limit what is practical and how consistent the result will be. For new concrete, the designer, concrete supplier, builder and polishing contractor should coordinate the mix, placement, curing, protection, set-out and sample expectations before the slab is poured.
Keep aggregate exposure and sheen as separate choices
First agree how much of the existing or selected stone should be visible; then define how reflective the refined surface should appear.
Minimal or cream exposure
Minimal grinding aims to retain more of the surface paste and expose little coarse aggregate. It can produce a quieter appearance, but the result depends heavily on how evenly the slab was placed and finished. Trowel marks, colour variation, local high areas and repairs may remain visible. It should not be sold as automatically cheaper, faster or more uniform until the slab and scope are known.
Partial or salt-and-pepper exposure
Partial exposure reveals smaller aggregate and sand through parts of the surface. It can create a more varied appearance and may make some natural slab variation less prominent. The amount exposed will still change across high and low areas unless the project accepts deeper grinding, levelling work or variation.
More or full aggregate exposure
Deeper grinding reveals more of the coarse aggregate. The aggregate type, colour, distribution and previous repairs become part of the finished appearance. Existing slabs can produce unexpected stone, patching or inconsistent exposure. New slabs can be designed with selected aggregate, but the finished result still depends on placement, finishing, curing and grinding.
Terms and exposure classes vary between specifications and proprietary systems. Record the intended visual result, acceptable variation and representative sample instead of relying on a label alone.
Choose sheen after the use and maintenance plan are clear
Lower-sheen, satin and higher-gloss finishes describe appearance, not a universal grit sequence, cost, durability or slip result. The equipment, abrasives, densifier or guard, number of stages and acceptance method must suit the slab and selected system. One contractor's "satin" may not match another supplier's measured or visual definition.
- Lower sheen: can reduce strong reflections and may make day-to-day marking less prominent, but it is not automatically easier to clean or safer.
- Satin or mid sheen: can balance reflectivity and a more restrained appearance where that suits the design brief.
- Higher gloss: can increase reflected light and visual contrast, but can also make dust, scratches, construction damage or uneven refinement more noticeable.
Agree whether the finish will be assessed visually, by a project-specified measurement method, or both. Lighting direction and intensity affect what the floor looks like, so samples should be reviewed in representative site conditions.
The slab controls how closely a sample can be matched
A small off-site sample is useful for discussing colour, exposure and sheen, but it cannot reproduce the aggregate distribution, repairs, cracks, edges, joints and lighting of the actual floor. Where the decision matters, nominate a representative on-site trial area and document what it does and does not approve.
Existing patches and future repairs may remain visible after polishing. Edge machines, hand tools and restricted areas can also create a different appearance from open floor areas. The quote should explain edge scope, thresholds, stairs, corners, columns, penetrations and transitions rather than presenting one sample as a guarantee for every location.
Slip performance is not determined by gloss alone
No polished concrete finish is universally non-slip. Contaminants, footwear, tasks, slope, drainage, cleaning, wear, surface treatment and wet or dry conditions all affect slip risk. Workplace Health and Safety Queensland's floor and ground-surface guidance explains that there is no single correct or safe slip-resistance level for every situation.
Stairs, landings and ramps can have specific National Construction Code requirements. The ABCB's slip-resistance advisory note is a useful starting point, but the responsible project team must identify the applicable NCC edition, building classification, location, wet or dry condition, evidence and acceptance criteria.
External, wet, greasy or frequently contaminated areas may need a different surface or system from an internal dry space. Do not assume that visible aggregate or a lower gloss automatically supplies the required result.
Distinguish mechanically polished, guarded and sealed finishes
Mechanically polished concrete, a guarded finish, grind-and-seal concrete and other topical systems can look similar in photographs but have different build-ups, repair options, product windows and maintenance. Ask the quote to name the proposed system, every applied product and the written cleaning and specialist-maintenance instructions.
Use the reviewed polished concrete maintenance guide to plan grit removal, spill response and condition-led assessment. Avoid fixed resealing or repolishing intervals unless they come from the installed system's current instructions and actual floor condition.
Plan polishing work and silica controls together
Grinding and polishing concrete can generate respirable crystalline silica. Queensland's current crystalline-silica-substance processing requirements cover assessment, control, documentation and training where applicable. Project planning should also address isolation, access, electrical and noise risks, slurry or dust, waste, adjacent finishes and cleaning.
The Australian Government-backed Your Home concrete slab guide describes trowelled, burnished, ground, polished, coloured and exposed-aggregate approaches and notes that some finishes require careful protection during construction. It is a useful finish overview, not a project specification.
Polished concrete finish quote checklist
- Site, floor area, room use and wet, dry or external conditions.
- Existing or new slab, construction history and available drawings.
- Current coverings, coatings, adhesives, contamination and repairs.
- Cracks, joints, moisture concerns, level changes, stairs and edges.
- Desired aggregate exposure, sheen, colour and acceptable variation.
- Required slip, cleaning or other project-specific performance evidence.
- Access, staging, other trades, protection and return-to-use dates.
- Trial area, inspection, handover, cleaning and future maintenance scope.
View Wirth Floor's polished concrete service, compare the broader Brisbane project-planning guide, or request a floor assessment for Brisbane and South East Queensland.
This is general planning information. Final finish, system, controls, testing, compliance, programme and maintenance must reflect the actual slab, location, supplier documentation, project requirements and advice from the responsible professionals.