The UK Surface Roughness Group Slip Testing Services

Welcome to the UKSRG

The UK Surface Roughness Group test floors for slip risk. If you require a real slip test, we will also measure Rz micro roughness free of charge if you wish. We will use UKSRG, UK Slip Resistance Group, Guidelines for testing if you require.

We know that roughness does not measure slip resistance, does not measure change to slip resistance, and cannot detect contamination, the biggest cause of slip accidents.

We won't lie to you and pretend that a change to the Rz measure means you need to change your floor or have a more thorough/expensive slip test. We know that each Rz measure will vary so much that even an average of 10 readings will vary from one test to the next. We know that a change to the Rz measure on your floor will probably have no relationship with a change to the slip resistance of your floor.

This UKSRG UK Surface Roughness Group is an independent group not connected to the other UKSRG. We are independent, despite being chaired by a person who works for a real slip testing company.

Did you know?...

Roughness is not a useful measure of pedestrian slip risk.

Rz has very poor corelation with slip resistance
Rz roughness will not detect contamination
Rz will not detect changes to slip risk caused by wear or polish/coatings or anti-slip treatments

If you monitor the slip risk of your floors with a roughness meter you may have been mis-sold and should get your money back. If any slip injuries that have occured while you have been monitoring floors with roughness then please contact us.

We disagree with UK Slip Resistance Group

We agree with the UK Slip Resistance Group aims...

to further the undesrtanding of pedestrian slipping
to promote reliable slip test methods

But we disagree with their view of Rz micro roughness as a measure of slip resistance for floors. They claim that Rz measures taken on a dry floor will "nearly always match" wet PTV measures of the same floor. the graph below shows an HSE comparison of Rz vs PTV. Roughness certainly doesn't "nearly always match", in fact in the important range of "at risk floors" their is a near perfect mismatch between Rz and PTV.

If you would like to improve floor safety, then please contact us. If you'd like the UK Slip Resistance Group to explain this bizarre claim then please contact them directly or tell us and we will register your concerns.

UK surface roughness group say Rz does not measure slip risk

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If you are seeking the UKSRG (UK Slip Resistance Group) then you may have come to the right place. The UK Slip Resitance Group should be an independent group with aims relating to reducing slip accidents and reducing slip injuries. In practice, it is a "closed" group chaired by the HSE that dwells on the TRL Pendulum (designed in 1930), and more worryingly supports the use of measuring and monitoring slip risk using mico roughness. You should be aware that microroughness is not the only factor involved in slip risk of floors. Rz micro roughness is just one of 11 characteristics of micro roughness and will not measure contamination or poor cleaning or change to slip risk. In this website you can learn all about roughness and its relationship(or lack of) with real measures of slip resistance such as PTV (Pendulum Test Values). Yes, we will measure Rz for you if you wish, but we will do so free of charge if you pay for a real slip test OR we will charge you top dollar prices if you really want a pointless test that will tell you nothing about the slip resistance of your floors.