Surface roughness

Fluid film formed between the heel and the floor - Low surface microroughness

Why is surface roughness important?

To have a low slip potential a floor needs to have enough microroughness to break through a contaminant and make solid-to-solid contact with the pedestrian's heel.

The thicker the contaminant, the rougher the floor needs to be to have a low slip potential.

HSE guidance and tools only refer to Rz data. Rz is a measure of total surface roughness, calculated as the mean of several peak-to-valley measurements. However a range of other roughness parameters can be measured with surface roughness meters.
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