Most flooring decisions are about how a surface looks and feels. Slip resistance is different — it is a safety decision, and it is the one number you should never guess at. In Australia, slip resistance is measured under AS 4586 (for new products) and AS 4663 (for floors already installed).
What the P-rating actually measures
The most relevant classification for a home is the pendulum wet test, which produces a P-rating from P0 to P5. It simulates a foot striking a wet surface and measures how much the surface resists slipping.
Higher is grippier. P0 and P1 are smooth, low-grip surfaces suited only to dry areas; P5 is a heavily textured surface for demanding wet and external applications.
P-ratings vs R-ratings — why you see both
You will often see an R-rating (R9 to R13) quoted alongside, or instead of, a P-rating. The R-rating comes from a different, German test (a ramp test with an oil-covered surface and boots) and is common because so much tile is imported from Europe.
The two are not directly interchangeable, but as a rough guide R10 corresponds to around P3–P4, and R11 to around P4–P5. Where safety matters, specify to the Australian P-rating rather than relying on an R-rating conversion.
When slip safety is critical, ask for the AS 4586 P-rating specifically — an R-rating is a European measure and only converts approximately.
Which rating belongs where
- P0–P2: dry internal areas only — living rooms, bedrooms, dry hallways.
- P3: internal wet areas in domestic use — bathroom floors, laundries, kitchens.
- P4: shower bases, communal wet areas, undercover external transitions.
- P5: pool surrounds, external steps and ramps, and other continuously wet, sloped or high-consequence surfaces.
Finish changes the rating
The same stone or tile can carry very different ratings depending on its surface finish. A polished marble might be P1; the same marble honed could reach P3; sandblasted or flamed, it can jump to P5. This is why a leathered or tumbled finish is so often specified for wet zones — the texture is what delivers the grip.
It also means you cannot judge slip resistance by eye or by material name alone. Always confirm the tested rating for the specific finish you are ordering.
A note on grout and maintenance
Slip resistance is not fixed forever. Soap scum, body oils and poorly maintained grout all reduce grip over time, and worn-in dirt can lower the effective rating of an installed floor. Specifying one rating higher than the minimum for the room gives you a safety margin as the surface ages.
If you are unsure which rating a room needs, the safe move is always to step up a level and to confirm the AS 4586 P-rating for the exact finish before you order. The studio can supply the tested rating for any finish in the collection.
