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AS 4586 Slip Ratings for FRP Grating and Walkways
Overview
This Tech Talk Tuesday session explains how AS 4586 slip resistance classifications apply to pedestrian surface materials, with a focus on FRP grating and access surfaces used in wet, external and industrial environments. The session covers the difference between Appendix A wet pendulum testing and Appendix D oil wet ramp testing, and explains why the right test method should be selected based on the actual site environment.
AS 4586 is the Australian Standard used to classify new pedestrian surface materials according to their frictional characteristics, using different test methods for wet and dry conditions. Standards Australia describes AS 4586-2013 as the standard for “Slip resistance classification of new pedestrian surface materials,” while the New Zealand Building CodeHub summary notes that it classifies pedestrian surface materials according to their frictional characteristics using test methods in Appendices A, B, C, D and E.
The webinar focuses mainly on two classifications relevant to Treadwell FRP products: the P rating, especially P5 under wet pendulum testing, and the R rating, especially R13 under oil wet ramp testing. It also highlights that slip ratings are not interchangeable, as each classification relates to a specific test method and use environment. Treadwell’s own AS 4586 guide reinforces the same point, noting that understanding the difference between P, R and barefoot classifications helps surfaces be specified correctly for safety and compliance.
Key Benefits
Clearer understanding of AS 4586 slip resistance testing
The session helps specifiers understand that AS 4586 is not a single universal slip rating. It includes different test methods, including wet pendulum testing, dry floor friction testing, wet barefoot testing and oil wet ramp testing. Each method is relevant to different surface conditions and project environments.
Correct use of P ratings for wet pedestrian surfaces
Appendix A of AS 4586 covers the wet pendulum test, which is suitable for wet pedestrian surfaces such as external walkways, ramps, boardwalks and jetties. The test uses a pendulum-style device to simulate a heel strike on a wet surface, with the result classified from P0 to P5.
P5 performance for high-risk wet areas
The webinar explains that P5 is the highest wet pendulum classification and is suitable for high-risk wet areas. Treadwell states that its FRP products achieve a P5 rating, supporting their use in external and wet access environments where slip risk needs to be reduced.
Consistent slip resistance in both directions
Some materials can perform differently depending on whether users walk north-south or east-west across the surface. The webinar notes that Treadwell FRP slip resistance classifications apply in both directions, which reduces orientation concerns during specification and installation.
More relevant testing for contaminated industrial environments
Appendix D oil incline testing is relevant where surfaces may be exposed not only to water, but also to oil, fluids, debris or industrial build up. This makes the R rating particularly useful for mine processing, water treatment, machinery areas, ports, cranes and other industrial access surfaces.
R13 classification for demanding industrial access areas
The webinar explains that R13 is the highest oil wet ramp classification, suitable for very high oil exposure. Treadwell states that its FRP products achieve R13, making them suitable for environments where wet or contaminated surfaces may create a higher slip risk.
Better project-specific specification
The session emphasises that specifying the right slip resistance classification helps ensure the product is fit for purpose. For example, there is limited value in specifying a dry floor test for a surface that will always be wet, or using a wet-only test where oil and industrial contaminants are the real concern.
Risk reduction for asset owners and designers
Specifying appropriate slip resistance helps reduce slip and fall risk, improves safety and supports better liability management. The webinar recommends using high-performance classifications for external walkways, boardwalks, jetties and similar wet pedestrian areas where reducing slip risk is important.
Comparison between different surface products
AS 4586 testing allows different flooring and walkway materials to be compared using consistent test methods. This helps project teams evaluate FRP grating against other pedestrian surface options and confirm whether the product is suitable for the intended environment.
Applications
External FRP walkways and platforms
P5 wet pendulum performance is relevant for external access surfaces that may be exposed to rain, spray, wash down or other wet conditions. This includes FRP platforms, walkways and access routes in industrial and infrastructure environments.
Boardwalks and jetties
The webinar specifically recommends P5 slip resistance for boardwalks, jetties and similar external pedestrian structures. These areas are often exposed to weather and water, so wet pendulum performance is an important specification consideration.
Ramps and inclined pedestrian surfaces
AS 4586 Appendix D includes oil wet ramp testing, with R classifications from R9 to R13. The webinar explains that while these classifications indicate slip resistance at increasing ramp angles, they do not override other design requirements under standards such as AS 1657 or AS 1428 for walkway gradients, cleats, ramps and access compliance.
Industrial areas with oil, debris or process fluids
R13 performance is relevant for mine processing, machinery areas, ports, cranes, water treatment plants and other environments where the walking surface may be contaminated by more than water. This makes oil incline testing more realistic for certain industrial sites than wet pendulum testing alone.
Water treatment and process facilities
Water treatment environments may include wet surfaces, chemical exposure, debris or industrial residues. The webinar identifies water treatment as one of the industries where R rating classification may be more relevant because the surface condition may include contamination beyond clean water.
Conveyor access walkways and sloped structures
The session notes that some walkways, such as those alongside conveyors, may be fixed to the equipment or structure and may not be easy to redesign to a preferred gradient. In these cases, slip resistance testing can help assess surface performance, while other access standards still need to be considered separately.
Product specification and tender documentation
Designers can include project-appropriate AS 4586 requirements in specifications, helping contractors and suppliers provide surface materials with suitable test results. The webinar strongly encourages specifiers to state the required slip testing classification rather than relying on generic anti-slip claims.
Comparison of FRP with other flooring materials
AS 4586 classifications provide a way to compare FRP grating with other pedestrian surface materials. This is useful when project teams are assessing alternatives for safety, performance, durability and suitability in wet or contaminated environments.
Project-specific slip resistance discussions
The session repeatedly notes that the guidance is general in nature and that project-specific advice should be sought where the application, environment or compliance pathway requires deeper review. This is especially important where the surface is inside a building, in a wet barefoot area, in a commercial kitchen or subject to special access requirements.
Key Moments
- 00:51 📜 AS/NZS 4586 standard sets out testing and classification for slip resistance of pedestrian surfaces.
- 02:18 🔍 Focus on Appendix A (wet pendulum) and Appendix D (oil incline); brief on B (dry) and C (barefoot).
- 02:30 🎯 Specify slip resistance relevant to the environment (e.g., wet, oily) for risk mitigation and product comparison.
- 03:27 🧪 Appendix A: Wet pendulum test simulates heel strike on wet surface; classifies P0 (low) to P5 (high).
- 04:46 💧 P5 suitable for high-risk wet areas like ramps, walkways, outdoors.
- 05:28 ⭐ Treadwell products achieve P5 rating under AS/NZS 4586.
- 05:41 ⚠️ P5 requires aggressive surface texture; smooth finishes slip easily.
- 06:36 ➡️ FRP slip resistance is isotropic (same in all directions, no orientation needed).
- 07:03 🛤️ Recommend P5 for boardwalks, jetties, and external walkways to maximise safety.
- 07:46 📋 National Construction Code sets minimum AS/NZS 4586 requirements; aim highest possible.
- 08:38 🛢️ Appendix D: Oil incline test for contaminated surfaces; classifies R9 (low) to R13 (high).
- 09:18 🏭 R13 ideal for industrial areas with oil (machinery, ports, mines, water treatment).
- 10:38 📏 R ratings indicate safe slopes (e.g., R13 >35°), but check AS 1657/AS 1428 for walkways/ramps.
- 12:31 🏆 Treadwell FRP achieves R13 oil-wet resistance.
- 12:58 ⚖️ Use P for wet, R for oily; products may excel in one but not the other.
- 14:06 🧫 Wet pendulum testable in situ/lab; oil incline lab-only (large samples needed).
- 15:17 🚫 R13 not for kitchens; use Appendix B (dry) or C (barefoot) for indoors.
Why Treadwell?
Treadwell brings practical FRP product knowledge together with a clear understanding of how slip resistance classifications affect real project decisions. This webinar does not simply state that a product is anti-slip. It explains the difference between wet pendulum testing, oil wet ramp testing, dry floor testing and barefoot classifications, then connects those test methods to actual environments such as jetties, ramps, industrial sites, machinery areas and water treatment plants.
Treadwell’s FRP products are positioned for safety and performance across external, industrial and infrastructure access environments. The company states that it provides FRP solutions and anti-slip materials across diverse sectors, supported by practical calculations, data and project delivery experience.
The key advantage for specifiers is that Treadwell can help align the product, surface finish and AS 4586 classification with the actual site conditions. For wet external pedestrian use, P5 classification may be the most relevant. For contaminated industrial environments, R13 oil wet ramp performance may provide a more appropriate indication of real-world slip resistance. Treadwell’s own AS 4586 guide reinforces that P, R and barefoot classifications are not interchangeable and should be selected according to the intended environment.
By combining FRP product supply, anti-slip surface performance and project-specific technical support, Treadwell helps engineers, contractors and asset owners specify access surfaces that are safer, more appropriate and better aligned with Australian slip resistance requirements.
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*Disclaimer
The information on this page is derived from webinar content and AI-assisted transcription and summarisation. While every effort has been made to ensure accuracy, minor inaccuracies may occur. We recommend viewing the original webinar recording for context.
