new Britsish Standard slip test SlipAlert

21st Century Slip Testing. Protect your business from slip risks...

Resources + Videos to manage slip risk = contact SLipAlert

Slip Risk Changes


The slip risk of a floor changes - more than you may think...

  • The floor surface may be altered by accident or by design

  • The slip risk of any one floor can change in the course of a day, a week or a year, or it may stay virtually the same throughout its life

  • Changes to the floor surface caused by wear (pedestrian traffic, vehhicles, trolleys) or even changes to the floor surface caused by the cleaning method

Slip Risk Numbers


SlipAlert Test Value (STV)

< 130

130 - 136

137 - 160

161 - 179

> 180

Wet Slip Risk

Low Risk

Low Risk



High Risk

Suitable for

Very Wet

Wet Areas

Transitional Areas - can occasionally become wet

Areas kept largely dry

Dry Areas








> 40

39- 36

35 -24

23 - 19



(Co-efficient of Friction)

> 0.40

0.39- 0.36

0.35 - 0.24

0.23 - 0.19




Variations on a Floor

  • The floor surface (and slip risk) may be changed by coatings, polishes, treatments or wear

  • Contaminants may bond to the floor surface (e.g. Algae on an outdoor floor

Variation Over Time

  • On some floors the slip risk can change significantly in the course of each day (e.g. a kitchen)

  • Wear, coatings, polishing or contamination may change the slip risk progressively

The Effects of Wear on Slip Risk

  • Wear caused by pedestrians or vehicles can change the floor surface

  • Regular buffing may polish up the surface and change the slip resistance

Did you know?...

A safe floor has less than a 1 in 1 million risk, while a high risk floor has 1 in 2 risk i.e. on a high risk floor most people in normal shoes will need to modify their gait to avoid slipping.

Case Study: A Shopping Mall

After 10 years with no serious slip injuries, a shopping mall reported several serious slip injuries and 6 broken limbs in one day. This type of change is very common. Many businesses enjoy years without serious slip injuries. A small change to the cleaning regime, cleaning fuids, cleaning machines or perhaps a different fiinish applied to the floor can make a big difference.

In this case, a change to cleaning had caused the slip risk to rise significantly.


Monitoring the slip risk over time will prevent many slip accidents.

Monitoring slip risk takes seconds and will prevent injuries
Abnormally high risk on one area of floor
Some shopping malls monitor random areas of floor every day. If one area of floor measures a higher risk than the others it results in re-cleaning that area and greater care of future cleaning.
Slowly Rising Risk
Some swimming pools notice rising levels of slip risk over time. This can be caused by a build up of body fats that normal cleaning does not remove. Without slip test data , the floor would be an accident waiting to happen.
Most slip accidents can be anticipated and therefore prevented.


Guide to Slip Prevention

The links below reflect the links on the pages of the Pocket Guide to Slip Prevention.

Slip Prevention Extra Detail

Order Your Pocket Guide

The printed version of the Pocket Guide to Slip Prevention is a free publication designed to help you to manage slip risk. Contact SlipAlert




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