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Testing non slip decking – understanding the Pendulum Slip Test

Whilst it might be reassuring to know that non slip decking is “tested and approved”, it can be of more value to actually understand that test so that you can explain the process to your customers, should it become necessary.

Given that DeckWright enjoys a PTV of 71, we thought that we would take a moment to explain exactly how this figure has been calculated and what it truly means in terms of non slip decking.


Introducing the Pendulum Slip Test

The HSE’s preferred method of testing potentially slippery floor surfaces is called the Pendulum Slip Test. The resulting score is called a PTV (Pendulum Test Value).

It’s not just non slip decking that is open to this testing procedure – any surface that presents a risk of becoming slippery can be assessed in this way.

The relatively simple test is designed to replicate the heel of a shoe making contact with the surface as somebody walks on it. Therefore, the test is measuring dynamic coefficient of friction (CoF).

A simple measuring device is used. It includes a pendulum that falls onto the surface, just like the heel of a shoe making contact. This “shoe” stays in contact with the surface for 127mm. This figure is based on the average length that an average shoe would travel along the surface. During this time, the resistance is measured and a needle on the device travels around a number scale, stopping at the given level of resistance. This score is what determines the PTV value.

How does it test non slip decking?

When assessing timber decking in wet weather – where the highest possible risk of slipping is, the Pendulum Slip Test needs to be undertaken first on the decking when it is dry and then on the same decking surface when it is wet.

You would of course expect a much lower score to be seen when non slip decking is wet as oppose to dry. But it is this score that determines what level of “anti slip” the decking is offering.

For a timber decking manufacturer to use the term “anti” or “non slip decking”, the PTV must be 36 or above. The following details explain how each level is described:

PTV is 0-24: high slip potential

PTV is 25-35: moderate slip potential

PTV is 36+: low slip potential

Of course, it is also important to ensure that the non slip decking is not too grippy! At 71 PTV, DeckWright sits in an optimum position of being robustly non slip, whilst not being overly so.

DeckWright – professional non slip decking

DeckWright has been independently tested by the Health and Safety Laboratory in Buxton in accordance with BS7976: 2002, scoring 71 PTV. This is a great result that compares very favourably against many competitor products. Furthermore, our manufacturing process has also been independently QA audited and is compliant with ISO 9001:2008.

Be assured that DeckWright is a most effective and very long-lasting non slip decking product, ideal for both commercial and domestic use, whatever the weather throws at us.

If you'd like to receive further information about DeckWright or if you'd like us to send you some samples to review and trial, please do get in touch and we will be happy to help you. You might also like to view our DeckWright brand website:


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