WJ Deckwright

How is non slip decking tested?

By November 24, 2015 April 24th, 2019 No Comments

If you’re looking to purchase non-slip decking, make sure that you understand how it has been tested and what level of performance you can expect – all non-slip decking products are not the same.

The pendulum slip test

DeckWright Anti-Slip has been independently tested using the HSE’s preferred test – the pendulum slip test.

The principle behind this test is quite simple and it is used for all floor surfaces that might become slippery. Designed to replicate a heel on a shoe striking the surface, the test measures dynamic coefficient of friction (CoF).

The heel of a shoe is most likely to slip as it hits the surface and so a pendulum creates the same effect, measuring the result and creating a score. So if we’re testing non-slip decking, the pendulum will first fall onto the decking when it is dry – the rubber “shoe” at the end of the pendulum assessing the level of grip. When dry, non-slip decking will generally achieve a much higher score – just like other floor surfaces. The challenge comes when the surface is wet.

The spring-loaded shoe hits the surface and stays connected to the floor for 127mm (based on the length that an average shoe would travel on the surface), carrying a marker rather like a needle. This needle then travels through the numbered scale and stops at the given level of resistance. It’s this reading that determines the slip resistance of the surface.

This very same process is then repeated on the same surface when it is wet. A lower score is clearly likely, but the issue is whether that score still deems it sufficiently slip resistant to be called “anti-slip”.

To use the description of non-slip decking, the product must achieve a PTV (Pendulum Test Value) in excess of 35 as the following levels show:
0-24: high slip potential
25-35: moderate slip potential
36+: low slip potential

DeckWright scored 71 – highly anti slip!

It is now clear to understand why we can call DeckWright a very effective non slip decking product. Independently tested by the Health and Safety Laboratory in Buxton in accordance with BS7976: 2002, DeckWright Anti-Slip scored a PTV of 71. We’re proud of this achievement as it’s notably higher than many competitive products. The anti-slip decking manufacturing process is also independently QA audited and is compliant with ISO 9001:2008. So when you choose DeckWright as your anti slip decking, you can be assured that it will significantly reduce the risk of slipping – even in the biggest of British downpours.