Polished concrete meets NZ commercial slip resistance requirements when specified and finished correctly. Every finish we deliver, right up to high-gloss, passes the slip standards used in commercial buildings - the same specifications we've met on malls, Pak'nSave, Countdown, BP, and many other strict-compliance projects over the years. The levers that shift the rating are finish level (matte through to high-gloss) and grind depth, which exposes more aggregate and changes the surface profile. We use penetrating sealers rather than topical coatings, so slip resistance comes from the concrete surface itself, not from an added film or additive. This article covers the framework so facilities managers and architects can spec confidently.
About this guide. We polish concrete across Auckland's retail, hospitality, office, and warehouse sectors. The slip-rating guidance here is based on 14 years of commercial work and reviewed against current AS 4586 testing standards. Reviewed by Bowie Houston.
Last reviewed: May 2026 | Author: Bowie Houston, Director, Diamond Shine Concrete
We polish concrete across Auckland's retail, hospitality, office, and warehouse sectors. The slip-rating question comes up early in every commercial spec - and the honest answer is that polished concrete CAN meet the rating, but the finish choices matter more than people realise.
How NZ Slip Ratings Work (Quick Reference)
NZ commercial flooring is generally specified against AS 4586 (the wet pendulum test) or AS 4586:2013 (the oil-wet ramp test). The most common ratings you'll see in specs:
| Rating | Wet pendulum (BPN) | Where it's specified |
|---|---|---|
| P0 | < 12 BPN | Not used (failure) |
| P1 | 12-24 | Indoor dry pedestrian areas |
| P2 | 25-34 | Indoor wet pedestrian (entries) |
| P3 | 35-44 | External pedestrian, ramp areas |
| P4 | 45-54 | External wet pedestrian, pool surrounds |
| P5 | 55+ | Stair treads, high-risk wet areas |
Most internal commercial areas (retail, office, hospitality) target P2 or P3 when wet conditions are likely. External and pool-area work targets P3-P5. If you're working with an architect or designer, the rating will come from their consulting engineer or facility safety review.
What this means in practice
A polished concrete floor's slip rating depends on:
1. Finish level - matte through to high-gloss 2. Grind depth - light/medium/heavy aggregate exposure
A standard mechanically polished satin to semi-gloss floor typically tests in the P2-P3 range when wet. Taking the grind deeper (medium-to-heavy aggregate exposure) adds micro-texture that can push the wet rating to P4 or higher. Even our high-gloss finishes pass the required commercial standards. We can talk through specific values for your project, but final certification needs to come from a tested sample on your site.
How Finish Level Changes the Slip Rating
Finish level shifts how much grip the floor has when wet, but every level we deliver still meets the required commercial standards. The rating moves within the compliant range; it doesn't fall out of it.
Matte. Most grip when wet, because the surface profile is the roughest. But matte stains and wears more visibly than satin or gloss. For commercial floors that get cleaned frequently and need to look uniform for years, matte is harder to maintain.
Satin to semi-gloss. The middle ground we recommend for most commercial work. Slip resistance is good when wet, the surface looks premium, and wear shows less obviously than matte. This is our default recommendation for retail, office, and hospitality.
Gloss and high-gloss. Looks dramatic and reads more reflective. It still passes the required slip standards - it's the specification we've delivered in malls, Pak'nSave, Countdown, BP, and other strict-compliance projects - but it shows scratches faster and reads brighter, so we usually reserve it for areas where heavy wet traffic is rare. Slip compliance is not the reason to avoid it.
Cream / no-grind polish. Smooth and reflective with the least aggregate texture, so it has the least grip of the polished options. Best suited to showrooms or low-risk dry zones.
Note: this is the same finish guidance we give residential customers (see our slip resistance article) - the principles don't change for commercial work. The difference is the rating documentation required. For a fuller comparison of finish levels and where each works, see our satin vs semi-gloss vs high-gloss guide.
How Grind Depth Affects Slip Rating
Heavier grinds expose more aggregate. The aggregate stones project (very) slightly above the cement matrix, creating micro-texture that improves wet slip resistance.
| Grind level | Aggregate exposure | Wet slip behaviour |
|---|---|---|
| Cream / no grind | None - just polishing the surface | Lowest slip resistance |
| Light grind (salt and pepper) | Tops of stones only | Slightly improved |
| Medium grind | Moderate aggregate showing | Better wet performance |
| Heavy grind (full exposure) | Large aggregate prominent | Best wet slip resistance |
For commercial wet-zone areas, we'll often recommend a heavier grind paired with a satin to semi-gloss finish. This balances visual quality with slip performance.
True salt and pepper (light grind) isn't always achievable on older slabs or where tiles/glue have been removed - those usually need medium-to-heavy grind to level out and remove residue. The good news for slip performance: heavier grinds also test better.
How We Handle Wet Zones
For entries (rain water tracked in), kitchens, bathrooms, and around dishwashers and sinks, the rating sometimes needs to sit at P3 or above. We get there mechanically rather than with coatings:
Heavier grind. Taking the grind deeper exposes more aggregate, which projects slightly above the cement matrix and adds micro-texture. This is our main lever for lifting wet slip resistance in a specific zone, and it keeps one continuous look across the floor.
Densifier/hardener products. Applied during the polishing process to harden the cement matrix. They don't change the slip rating directly, but they reduce wear so the surface profile stays stable for longer.
Penetrating sealers, not topical coatings. We seal with penetrating products that soak into the concrete rather than sitting on top as a film. That is why we never add anti-slip additives - there is no topical coating for them to go into, and the slip resistance comes from the concrete surface itself.
For most commercial jobs we polish across Auckland, a satin to semi-gloss finish over a medium grind hits the typical P2-P3 spec without anything extra. Where a spec calls for P3+ in a specific wet zone, we deepen the grind in that area.
Real-World Example: Retail and Hospitality
For a retail fit-out we polished recently in central Auckland, the architect's spec called for P3 in customer-facing areas and P4 at the entry. We delivered:
- Sales floor - medium grind, satin to semi-gloss polish. Tested at P3 when wet. Looks premium and meets the spec.
- Entry zone (first 3 metres) - same finish over a heavier grind for extra aggregate texture. Tested at P4 when wet.
- Back-of-house - standard satin to semi-gloss polish, dry zone only. Tested at P2.
Single floor, three slip-rating zones, one continuous look, all from mechanical polishing with no topical coatings or additives. The customer doesn't see the difference visually - they just don't slip on rainy days. This is how we approach most commercial slip-rating jobs, the same way we have on supermarket and service-station floors across Auckland.
For more on commercial polished concrete specifically, see our why supermarkets choose polished concrete article.
Frequently Asked Questions
What slip rating does standard polished concrete achieve?
A standard mechanically polished satin to semi-gloss floor typically tests P2-P3 when wet. A heavier grind pushes it higher. Even high-gloss finishes pass the required commercial standards. Site testing on a sample is the most reliable way to confirm a specific rating.
Is polished concrete safe in commercial wet areas?
Yes, with the right specification. Most commercial wet zones (entries, hospitality kitchens, retail back-of-house) hit P3 or higher with a heavier grind and a satin to semi-gloss finish. It's the same specification we've met in supermarkets and service stations across Auckland.
How much does commercial polished concrete cost in Auckland?
Commercial pricing depends on scale: 200-500m2 is typically $60-$80 per m2 + GST, 500-1,000m2 is $50-$70, and 1,000m2+ jobs come down to $45-$65. Heavier-grind wet zones and detail work add small premiums. Our pricing guide covers the full breakdown.
Will the slip rating change over time?
The base slip rating is stable for years - the floor structure doesn't change. What can change is the cleaning regime: build-up of residue from wrong cleaning products can reduce slip resistance over time. Stick to pH-neutral commercial floor cleaner.
Do we need to test the floor for slip rating after polishing?
Not always required, but recommended for projects where the spec requires documented compliance. Independent testing on a sample area provides certified ratings for facilities documentation.
Can polished concrete meet H&S requirements for restaurant kitchens?
Restaurant kitchens are one of the highest-rated commercial wet zones, often spec'd at P4. Polished concrete with a heavy grind and a satin to semi-gloss finish can meet this, and it's the kind of specification we've delivered for supermarkets and service stations. For very high-grease environments (commercial frying), the cleaning regime matters as much as the finish - we can advise on the right approach for your kitchen type.
Do you add anti-slip coatings or additives to the floor?
No. We use penetrating sealers that soak into the concrete rather than topical coatings that sit on top, so there is no film to carry an additive. Slip resistance comes from the finish level and grind depth instead. This is more durable long-term, and it is how we have met strict slip specifications in malls, supermarkets, and service stations across Auckland.
Talk to Diamond Shine Concrete
Spec'ing a commercial polished concrete floor and need to confirm slip compliance? We've polished hundreds of residential and commercial floors across Auckland, the North Shore, East Auckland, West Auckland, and South Auckland. Have a look at our grinding and polishing services for the full process and what's included, or get in touch for a free site visit and quote.
