Slip Testing Explained
Everything you need to know about slip resistance testing — what it is, how it works, why it matters, and what the results mean for your premises.
What is Slip Resistance Testing?
Slip resistance testing (commonly called "slip testing") is the scientific measurement of how slippery a floor surface is. Using calibrated testing equipment, a qualified technician measures the friction between a standardised rubber slider and the floor surface under controlled conditions. The results tell you, in precise numerical terms, how likely someone is to slip on that surface.
In Australia, slip testing is governed by two key standards: AS 4586:2013 for new surface materials and AS 4663:2013 for existing pedestrian surfaces. These standards define the test methods, equipment specifications, and classification systems used to assess floor slip resistance across Australia.
Slip testing is not a visual inspection or a subjective assessment. It is an objective, repeatable measurement that produces documented results you can use for compliance, insurance, and legal purposes. The results are classified using the P-rating scale (P0 through P5), with higher ratings indicating greater slip resistance.
Whether you manage a commercial building, aged care facility, hospitality venue, retail store, or residential property, understanding the slip resistance of your floors is essential for meeting your duty of care obligations under Australian workplace health and safety legislation.
The Science Behind Slip Testing
Slip resistance is fundamentally about friction — the force that resists the sliding motion between two surfaces in contact. When someone walks on a floor, friction between their shoe sole and the floor surface is what prevents them from slipping. When that friction is insufficient (due to water, oils, wear, or surface characteristics), a slip hazard exists.
Several factors influence a floor's slip resistance:
Surface Micro-Roughness
The microscopic texture of a floor surface is one of the most important factors. Surfaces with greater micro-roughness generally provide better grip, especially when wet. Over time, foot traffic, cleaning chemicals, and wear can smooth these micro-textures, reducing slip resistance.
Contaminants
Water, oils, grease, food debris, cleaning products, and dust all act as contaminants that reduce friction between a shoe and the floor. This is why wet slip testing is the primary assessment method — it simulates the most common real-world slip hazard condition.
Surface Material
Different flooring materials have inherently different slip resistance characteristics. Natural stone, ceramic tiles, vinyl, concrete, timber, and rubber all behave differently when wet or dry. The finish applied to a surface (polished, honed, matt, textured) also significantly impacts slip resistance.
Wear and Ageing
Floor surfaces change over time. High-traffic areas wear down more quickly, cleaning processes can affect surface texture, and environmental exposure can alter surface properties. What was a safe floor when installed may no longer meet slip resistance requirements after years of use.
Professional slip testing removes guesswork from floor safety assessment. Rather than relying on how a floor "looks" or "feels," testing provides objective, numerical data that can be compared against Australian Standards classifications.
Types of Slip Resistance Tests
Surface Test Australia offers two primary test methods, each providing valuable data about your floor's safety.
Wet Pendulum Test
Primary test method — AS 4586 & AS 4663
The wet pendulum test is the primary and most widely recognised method for measuring floor slip resistance in Australia. A calibrated pendulum device swings a standardised rubber slider across a wet floor surface, measuring the friction generated.
The result is expressed as a British Pendulum Number (BPN), which is then classified into a P-rating from P0 (very slippery) to P5 (excellent slip resistance). This test simulates a person's heel striking a wet floor — the most common slip scenario.
How it works:
- The floor surface is cleaned and wetted with water
- A calibrated rubber slider is fitted to the pendulum arm
- The pendulum is released and swings across the wet surface
- The friction between slider and floor is measured
- Multiple readings are taken and averaged
- The BPN value is classified into a P-rating
Dry Floor Friction Test
Supplementary test method
The dry floor friction test measures the coefficient of friction (COF) of a floor surface under dry conditions. While wet testing is the primary standard in Australia, dry friction testing provides additional valuable data about floor safety in normal, everyday conditions.
Dry friction testing is particularly important for identifying surfaces that have become dangerously smooth through wear, polishing, or contamination build-up. Some floors may perform adequately when wet-tested but still present slip hazards under dry conditions.
When dry testing is valuable:
- Polished or high-gloss floor surfaces
- Surfaces that accumulate dust or fine particles
- Areas where dry slip incidents have occurred
- Complementing wet pendulum results for a complete picture
- Insurance or legal investigations requiring comprehensive data
- High-traffic areas showing visible wear patterns
Understanding the P-Rating Scale
P-ratings classify floor slip resistance from P0 (very slippery) to P5 (excellent). Higher ratings mean better grip when wet.
| P-Rating | BPN Range | Slip Resistance Level | Typical Application |
|---|---|---|---|
| P0 | 0 – 11 | Very Slippery | Not suitable for any pedestrian area when wet |
| P1 | 12 – 19 | Slippery | Dry indoor areas only where wetness is unlikely |
| P2 | 20 – 27 | Moderate | Indoor areas with low risk of water contamination |
| P3 | 28 – 34 | Acceptable | General indoor areas, corridors, retail, offices |
| P4 | 35 – 44 | Good | Wet areas, bathrooms, entrances, aged care, ramps |
| P5 | 45+ | Excellent | Commercial kitchens, pool surrounds, oil/grease areas |
Important Note on P-Ratings
The minimum P-rating required depends on the environment and the level of risk present. Factors include whether the surface is likely to be wet, the slope of the surface, whether footwear is typically worn, and the vulnerability of the people using the space (for example, elderly residents in aged care). For detailed guidance on which P-rating is required for your specific environment, see our Australian Standards page or speak with Greg directly.
When Do You Need Slip Testing?
Slip resistance testing is not a one-off event. Floor surfaces change over time, and various circumstances call for professional assessment. Here are the most common situations where slip testing is recommended or required:
New Floor Installations
Verify that newly installed floors meet the required P-rating before handover or occupation. This is especially important for builders and developers.
Annual Compliance Checks
Regular testing ensures floors maintain adequate slip resistance. We recommend annual testing as a minimum for all commercial and public-access areas.
After a Slip Incident
If someone has slipped on your premises, testing provides objective evidence of the floor's condition. This documentation is essential for WorkSafe investigations and insurance claims.
Property Purchase or Lease
Before taking on a new property, testing helps you understand the current state of floor safety and any remediation that may be needed as part of your due diligence.
After Floor Treatment or Cleaning
Anti-slip treatments, polishing, sealing, or changes in cleaning products can all affect slip resistance. Re-testing after treatment confirms effectiveness.
Insurance or Legal Requirements
Insurers and legal proceedings often require documented slip test results. Professional testing provides the evidence needed to support your position.
How to Prepare for a Slip Test
Preparing for a slip test is straightforward. Here is what you need to know before Greg arrives.
Identify the Areas to Be Tested
Think about which floor surfaces you want tested. Common areas include entrances, corridors, wet areas (bathrooms, kitchens, laundries), outdoor walkways, ramps, and any area where slips have occurred or are a concern.
Ensure Access to All Test Areas
Make sure Greg can access all the surfaces you want tested. Move any furniture, mats, or obstructions where possible. If certain areas require keys or security access, arrange this in advance.
Clean Floors Normally
Floors should be in their normal, everyday condition for testing. There is no need for special deep cleaning — in fact, testing floors in their typical condition provides the most accurate and representative results. Do not apply any treatments or coatings before the test.
No Disruption to Your Business
Slip testing is non-destructive and relatively quiet. Greg can work around your normal business operations. Each test area takes only a few minutes, though the total visit time depends on the number of surfaces being tested.
Have Key Contacts Available
If you will not be on-site during the test, nominate someone who can provide access and answer any questions about the premises. Greg will discuss findings with the appropriate person on site.
What Your Slip Test Report Includes
Every slip test comes with a comprehensive, professional report designed to be clear, actionable, and suitable for compliance and legal purposes.
Test Methodology
Full documentation of the test methods and equipment used
Environmental Conditions
Temperature, humidity, and surface conditions at time of testing
Individual Results
BPN values and P-ratings for each surface tested
Photo Documentation
Photographs of each test location for reference
Compliance Assessment
Clear pass/fail assessment against relevant standards
Recommendations
Practical advice for any surfaces that need attention
Learn More
Explore our other resources to deepen your understanding of slip testing and Australian Standards.
Australian Standards
Deep dive into AS 4586, AS 4663, and HB 198. Understand the standards that govern slip testing in Australia.
Areas We Serve
Professional slip testing across Melbourne and Greater Victoria. Find your local suburb page.
About Greg Collins
Meet the technician behind Surface Test Australia. Learn about Greg's qualifications and personal approach.
Slip Testing — Frequently Asked Questions
Answers to the most common questions about slip resistance testing and Australian Standards.
What is slip testing?
Why do I need a slip test?
What is a P-rating?
How long does a slip test take?
How much does slip testing cost?
What Australian Standards apply to slip testing?
What is AS 4586?
What is AS 4663?
Who needs slip testing?
What happens if my floor fails the slip test?
How often should floors be tested?
What areas does Surface Test Australia service?
Do you test residential properties?
Do you provide slip testing for builders and construction projects?
Need Your Floors Tested?
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