Slip ratings tell you how much grip a tile gives underfoot. R ratings run from R9 (smooth, low grip) to R13 (heavily textured, high grip), and P ratings (P0 to P5) measure grip specifically for wet, bare feet. Match the rating to the area and you avoid the two worst outcomes: a tile that turns into a skating rink when wet, or one so rough it shreds bare feet and traps grime.
This guide decodes what each rating means and, more usefully, tells you exactly where each one belongs around an Adelaide home. It sits within our Outdoor, Pool and Splashback Tiling in Adelaide guide.
What R ratings actually measure
The R rating comes from a ramp test. A person in standard boots walks up a tiled ramp coated in oil while the angle increases until they slip. The steeper the angle they can hold, the higher the rating.
- R9 to R10: low to moderate grip, tested with shoes
- R11: good grip, the sweet spot for most outdoor areas
- R12 to R13: high to very high grip, for genuinely wet or sloped surfaces
The key thing to understand is that R ratings are tested with shoes on and oil underfoot. That makes them a good guide for a patio or a set of steps where people wear footwear, but a poor guide for a pool edge or a shower floor where feet are bare and wet. That is where P ratings come in.
P ratings and barefoot ratings decoded
For bare feet on wet surfaces, two systems matter. The older barefoot ramp test gives an A, B or C rating (A lowest grip, C highest). The newer wet pendulum test gives a P rating from P0 to P5, and this is the number your tiler and the Australian Standards care about most for wet areas.
| Barefoot / P rating | Grip level | Best suited to | | --- | --- | --- | | A / P0 to P2 | Low | Dry indoor floors only | | B / P3 | Moderate | Pool concourse, communal shower, change room | | C / P4 to P5 | High | Pool ramps, steps into water, steep wet zones |
If a tile only lists an R rating and you are tiling a wet bare-foot area, ask the supplier for the barefoot or P rating too. A tile can look grippy and still fail the wet pendulum test.
Where each rating belongs around an Adelaide home
This is the part that saves you money and grief. Over-specify and you get a rough tile that is miserable to clean; under-specify and someone slips. Here is a sensible mapping for Adelaide conditions, where summers are hot and dry but winter rain and morning dew still catch people out.
| Area | Recommended rating | Why | | --- | --- | --- | | Indoor living, bedrooms | R9 to R10 | Dry, easy to clean, comfortable underfoot | | Indoor wet areas (shower, laundry) | R10 to R11, P3+ barefoot | Wet bare feet, but still needs to mop clean | | Kitchen, entry from outside | R10 to R11 | Catches spills and tracked-in rain | | Covered alfresco, patio | R11 | Grips when wet, still sweeps easily | | Open patio, exposed courtyard | R11 to R12 | More rain and dew exposure | | Pool surround (concourse) | R11 to R12, B or C barefoot | Wet, bare feet, often running children | | Pool coping and edges | R12 to R13, C barefoot | The wettest, highest-risk strip | | Outdoor steps and ramps | R12, plus a defined nosing | Wet plus a change in level is the worst combination | | Driveway or vehicle areas | R12 to R13 | Grip for tyres and foot traffic when wet |
A quick rule of thumb: R11 handles most of the outdoor work around an Adelaide home, and you step up to R12 or R13 only for pool edges, steep areas, and steps.
For a deeper look at which specific tile types survive our climate, see the best outdoor tiles for the Adelaide climate, which covers frost, UV fade and heat underfoot alongside grip.
The traps people fall into
Treating steps like flat ground
Steps are where most slips happen, because you combine water with a change in level. A patio might be fine at R11, but the steps leading down to it should go to R12, ideally with a contrasting nosing strip and a defined edge so people can see and feel where the step is.
Forgetting bare feet at the pool
A pool surround is the one place where almost everyone is barefoot and wet, often moving quickly. This is exactly the situation R ratings do not test for. The barefoot or P rating is what matters here, and it is worth getting right. Our guide to pool tiling in Adelaide walks through waterline tiles, coping and the grip choices that keep a pool area safe.
Over-speccing the whole house
High-grip tiles have a deeper surface texture, and that texture holds dirt, soap scum and grime. Running R12 through your entire home means constant scrubbing. Most Adelaide homeowners are better off zoning it: a smooth R9 or R10 indoors, a comfortable R11 for the covered alfresco, and the higher grip reserved for the pool and steps where it earns its keep.
Assuming the rating is permanent
Grip is not forever. Heavy traffic, harsh cleaning chemicals and a build-up of film can all smooth a tile down over time. Choosing one step above the bare minimum, and cleaning with a suitable product rather than an aggressive scrub, keeps the grip working for years.
How ratings feed into your budget
Higher-grip tiles are not always dearer to buy, but the areas that need them (pool surrounds, steps, ramps) usually involve more cutting, more careful setting and more edge detailing, so the labour rises. Outdoor and pool tiling in Adelaide generally lands around $70 to $130 per square metre supplied and laid, with edges and steps at the top of that range. You can see how the numbers break down in our outdoor tiling cost guide.
The point is not to buy the highest rating you can find. It is to match the rating to each zone so you are safe where it counts and comfortable everywhere else.
Get it specified properly
Getting slip ratings right is one of those details that quietly separates a professional outdoor or pool job from a risky one. A good tiler will talk you through grip zone by zone, not just hand you one tile for the whole project.
If you are planning a patio, pool surround or set of outdoor steps, tell us about your project and we will connect you with vetted Adelaide outdoor and pool tilers who will advise on the right slip rating for each area and quote it properly. Compare free quotes from licensed local tilers with no obligation.