Understanding Australian Slip Ratings.

Slip resistance is an important consideration when assessing pedestrian surface safety and demonstrating compliance with the National Construction Code (NCC) and relevant Australian Standards. Slip ratings provide a consistent framework for evaluating how surfaces are likely to perform under different conditions, helping designers, builders, and specifiers select appropriate materials for a given environment.

Surface performance can be influenced by a range of factors, including pedestrian traffic levels, walking speed, footwear, and contamination from water, oil, or other substances. These variables can significantly affect slip resistance in real-world conditions, making accurate measurement essential when assessing floor safety and compliance.

To demonstrate NCC compliance, slip resistance classifications are typically determined using recognised test methods such as the wet pendulum test or the oil-wet inclining ramp test, in accordance with AS 4586:2013. The deemed-to-satisfy provisions of the NCC apply to specific elements including ramps steeper than 1:14, stair treads, landings, and nosings, with required classifications outlined in Table 3A. Supporting guidance documents, including HB 197 and HB 198, provide additional information on selecting appropriate slip ratings for different applications.

Together, these standards and guidelines help ensure pedestrian surfaces are assessed consistently, supporting safer design, regulatory compliance, and informed material selection.

Wet Pendulum Slip Ratings

The Dry Floor Friction Slip Resistance Test.

This method uses a specialized machine equipped with a Slider 96 rubber slider to measure the Coefficient of Friction (CoF). The results are classified as ‘D1’ (CoF ≥0.4) or ‘D0’ (CoF <0.4). While effective for quick assessments of dry surfaces, this test is not suitable for wet conditions. For surfaces that will remain wet, the wet pendulum test is preferred.

Dry Floor Friction Slip Ratings

The Wet Barefoot Inclining Platform Slip Resistance Test.

In this laboratory-based test, technicians walk barefoot on an inclined platform. The angle of the platform is gradually increased until a slip occurs. Results are categorized into four groups: ‘No Classification’, ‘A’, ‘B’, and ‘C’.

Wet -Barefoot Slip Ratings.

The Oil Wet Inclining Platform Slip Resistance Test.

This test is similar to the previous one but involves standard-approved boots and oil. Technicians walk on an oiled surface while the incline increases until a slip happens. Results are classified from ‘No Classification’ to ‘R9’ to ‘R13’.

Oil-Wet Slip Ratings.

It’s important to note that these testing methods are independent and have different strengths and limitations. The Wet Pendulum test is often favoured for its practicality, as it can be conducted both on-site and in the lab, making it more accessible than other laboratory tests.