Anti-Slip Coatings for Timber Floors and Stairs
P ratings, NCC requirements, which products actually pass, and how to get a test certificate. The complete Australian trade guide.
Why slip resistance matters on timber floors
A freshly coated timber floor can be dangerously slippery when wet — stairs especially. The coating controls the grip, not the species. The National Construction Code (NCC) mandates minimum slip resistance ratings on all internal and external stairs in Australian buildings, and building certifiers increasingly want test certificates before they'll sign off on occupancy. If you're coating stairs on any commercial or multi-residential job, this isn't optional.
Australian standards you need to know
AS/NZS 4586:2013 — Classification of new surfaces
The primary standard. It classifies pedestrian surfaces using three test methods:
- Wet pendulum test (Appendix A) — a swinging arm with a wet rubber slider measures dynamic friction. Results go P0 to P5. This is the most common test for timber floor coatings and can be done both in-lab and on-site.
- Oil-wet inclined ramp test (Appendix D) — a person walks on a tilted, oil-lubricated surface. Results go R9 to R13. Used for kitchens, food processing, and anywhere grease is a factor.
- Wet barefoot ramp test (Appendix B) — for pool surrounds, showers, and barefoot areas. Classified A, B, or C.
AS/NZS 4663:2013 — Testing existing surfaces
Covers in-situ slip resistance measurement of installed floors using the wet pendulum. This is the one used for post-installation verification and compliance certificates — what the building certifier wants to see.
HB 198:2019 — Guidance handbook
Non-mandatory guide with practical advice for specifiers and contractors. Complements AS/NZS 4586.
P and R rating scale
| P class | PTV range | Slip risk | Typical use |
|---|---|---|---|
| P0 | <12 | Very high | Not suitable for pedestrian areas |
| P1 | 12-19 | High | Dry internal only |
| P2 | 20-24 | Moderate | Dry internal, low traffic |
| P3 | 25-34 | Low-moderate | Domestic stairs (tread), general commercial |
| P4 | 35-44 | Low | Stair nosings, ramps, wet areas |
| P5 | 45+ | Very low | External wet areas, pool surrounds |
| R class | COF range | Approx P equiv | Use |
|---|---|---|---|
| R9 | <0.38 | ~P2 | Dry areas only |
| R10 | 0.38-0.42 | ~P3 | General stairs/ramps |
| R11 | 0.43-0.49 | ~P4 | Nosings, commercial ramps |
| R12 | 0.50-0.54 | ~P4-P5 | Wet commercial |
| R13 | 0.55+ | ~P5 | Oil/grease areas |
NCC requirements for stairs and ramps
The National Construction Code (BCA Volumes 1 and 2) references AS/NZS 4586 for stairway slip resistance:
| Location | Minimum rating | Applies to |
|---|---|---|
| Stair treads and landings | P3 or R10 | All Class 1-9 buildings |
| Stair nosings and landing edges | P4 or R11 | All Class 1-9 buildings |
| Ramps (Class 2-9) | P4 or R11 | Commercial, multi-res |
| External wet areas | P4-P5 recommended | Pools, decks, walkways |
Anti-slip coating products — all brands compared
| Product | Rating | Cert? | Notes |
|---|---|---|---|
| Bona Traffic HD Anti-Slip | P4 | Yes | Same durability as standard Traffic HD. Pre-mixed particles — no on-site additives. Factory-controlled consistency. Industry standard for commercial stairs. Sand-Aid stocks it. |
| Intergrain UltraFloor SlipResistant | P5 (3 coats) | Claimed | Exceeds P4. Solvent-based. Heavy-duty for external and high-risk areas. |
| Synteko Nova Best Anti-Slip | R10 | Claimed | Water-based. R10 is roughly P3 — treads only, not nosings. |
| Fiddes Anti-Slip HWO | R12 | Yes | Hard Wax Oil with anti-slip. R12 is roughly P4-P5. Oil finish, not poly. |
| Handley Anti-Slip Additive | P4 (with Low Sheen) | Yes | Powder additive mixed into Handley Urethane Low Sheen at 250g per 5L. Sand-Aid stocks the additive. |
| Stellmann Non-Slip Clear | P3 | Yes | Independently tested. P3 only — treads, not nosings. |
| Generic anti-slip additive | P3-P5 | Varies | Aluminium oxide / glass bead / polymer mixed into any poly. Result depends on concentration. Not factory-controlled. Risky on commercial jobs. |
| Polycure / Loba / Feast Watson | — | — | No dedicated anti-slip timber floor variants currently published in Australia. |
Bona Traffic HD Anti-Slip — the trade pick
Same 2K chemistry as standard Traffic HD. Same wear rating, same sheens, same application. The difference: inert non-reactive slip-resistance particles are mixed in at the factory, so every litre has exactly the same anti-slip level. No measuring powder on-site, no guessing concentrations, no batch variation. Exceeds P3 for treads and hits P4 for nosings — both in one coat. Building certifiers can pendulum-test the installed floor on-site and it'll pass.
Ideal for: staircases, aged care, entry foyers, food courts, cafes, restaurants, hospitals, medical centres, schools, public halls.
Sand-Aid stocks Bona Traffic HD Anti-Slip. Ring 1300 950 551 with the stair area and the certifier's requirements.
Getting a slip resistance test certificate
Building certifiers on commercial stairs, aged care, schools, and hospitality jobs may require a formal AS 4586 or AS 4663 certificate. It has to come from a NATA-accredited laboratory. Here are the main testing labs in Australia:
| Lab | Location | On-site? |
|---|---|---|
| Safe Environments (SlipCheck) | Sydney NSW | Yes |
| Sliptest Australia | Multiple (3 labs) | Yes |
| Stone Initiatives | Adelaide SA | Yes |
| Zerofal | Australia-wide | Lab only |
| Australian Slip Testing | Logan QLD | Yes |
Typical cost: $300-600 per on-site visit. Request testing to AS/NZS 4663 (existing surfaces) or AS/NZS 4586 (new samples). Factor this into the quote before you start — don't spring it on the client after the job's done.
Practical advice for the job
- Confirm stair requirements before quoting. Ask the builder or certifier whether they need a slip test certificate. If yes, quote Bona Traffic HD Anti-Slip and add $400-600 for testing.
- Nosings are the critical zone. Treads need P3 (most coatings pass). Nosings need P4 (most standard coatings fail). Use anti-slip coating on at least the nosing area, or install aluminium/rubber nosing strips.
- Don't use generic additive on commercial jobs without testing. The P rating depends on how much you mix in and how evenly you apply it. Factory-formulated products like Traffic HD Anti-Slip are batch-controlled. Generic additive isn't.
- Keep the certificate on file. If a slip incident happens years later, the certificate proves the floor met the standard at installation. Professional indemnity protection.
- Re-coating doesn't reset the clock. Anti-slip particles are embedded in the film. When the coating wears through, slip resistance drops. Re-coat before bare timber shows in traffic zones.
How to apply Bona Traffic HD Anti-Slip
Same process as standard Traffic HD. Sand to the right grit (use the grit picker for the sequence). Prime with Classic UX or Prime Intense depending on the species. Two coats of Traffic HD Anti-Slip at 8-10 m²/L. 2-3 hours between coats. Walk-on in 24 hours. The anti-slip particles are already in the can — just stir well before application and apply the same way you'd apply standard HD.
Use the coverage calculator to work out how many litres you need for the stair area.
Related: Standards & Specs FAQs →
Quoting stairs on a commercial job?
Ring with the stair area, the species, and whether the certifier needs a test certificate. You'll get the right product, the litres, and the testing lab referral in one call.
Call 1300 950 551