The UK’s independent authority on slip resistance

Important update regarding Rz value to estimate slip resistance

A presentation considering surface microroughness data was given at the Group meeting on 6th June 2019. The data presented suggest that 2 different machines, which appear to be measuring the same microroughness parameter, can give different results. The way the measured data is filtered appears to be the reason for the observed differences.

The Group reminds members, and other interested parties, that the roughness measurement should be considered as a complementary measurement to be used in conjunction with pendulum test values. Section 7 of the current Guidelines refers (Issue – 5 October 2016). Data from a single meter should only be used alongside PTV data generated at the same time in similar areas of the same flooring material. This may allow the experienced operator to make a comparison. As part of the ongoing review of the Guidelines the sections covering microroughness will be updated.

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