- P1–P2slip rating before
- P3required rating (AS 4663:2013)
- P4independently verified after
- No coatingsso no reapplication every two years
The problem
80 Collins Street is a landmark precinct in Melbourne's CBD with dining, retail, accommodation and offices. Its outdoor granite is exposed to rain and carries thousands of people a day, and it failed slip testing at P1–P2. Oily residue and soapy buildup had filled the stone's texture and removed its natural grip.
The site first asked us about a non-slip coating. Coatings work, but usually need reapplying every two years, and their gritty texture traps dirt and needs more deep cleaning.
What we did
We went back to the root cause instead:
- Deep cleaning to remove oily residue and soapy buildup.
- Honing to restore the stone's natural grip and refresh its look.
- Sealing to protect against future buildup and make cleaning easier.
We also organised and funded independent slip testing to confirm the result.
The result
Independent testing confirmed a P4 rating, above the required P3. The site now has a compliant, low-maintenance stone floor that looks consistently clean, and avoids the ongoing cost of recurring coatings.
Got a floor like this?
Send us a photo and we will tell you what we would do. Call 1300 207 915, text 0480 855 665 or email [email protected].
The Collins Street granite work sits with Premrest stone restoration and slip resistance testing: wet pendulum testing, a P rating, and a report you can file.