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Why Does Slip Risk Increase in Winter Months?
Slip risk increases in winter months because more water, mud and condensation come indoors, while darker days make wet patches harder to see. These pressures land on floors that may already have poor grip, so weaknesses that stayed hidden in dry weather show up. Winter rarely creates a slip problem. It exposes one that was already there.
The short why
Grip depends on what is on the floor and what the floor itself can hold. In summer, a worn or smooth surface may cope because little is testing it. In winter, wet footwear arrives at every entrance, and the same floor is asked to do much more.
What changes in winter?
Several pressures arrive together, and they combine:
- More water indoors: rain, melted snow and wet umbrellas are carried in on shoes, coats and bags
- Mud and leaves: autumn debris and wet ground are tracked through entrances and along main routes
- Condensation: cold surfaces and damp air can leave moisture on floors, particularly near doors and poorly ventilated areas
- Poorer visibility: shorter days and artificial lighting can make wet patches and changes of level harder to spot
- Heavier loads: people carry more and watch the floor less
Any one of these is manageable. Together, on a floor with limited grip, they are where slips happen.
Why does the same floor behave differently in winter?
Water forms a thin film between the sole of a shoe and the floor surface. On a smooth or worn surface, there is little texture to break through that film, so friction can drop sharply. A floor that offered good grip when dry can behave very differently when wet.
Footfall adds to this. Years of feet and wheels can wear a surface smoother, particularly along the busiest routes. That change is gradual and often invisible, which is why a floor can seem fine until the first wet week.
Why doesn’t a clean-looking floor mean a safe one?
This is the belief worth challenging directly. A floor that looks clean and dry is not necessarily a floor that is safe. Grip is invisible, and you cannot judge it by eye or by how it feels in your own shoes.
Winter can make the gap between appearance and reality wider. A floor can be mopped and look spotless, yet still be damp, carry a thin residue from cleaning, or have worn smooth. Mopping adds moisture to a floor that is already wet, and the wrong product or method can lower grip.
Wet floor signs have the same weakness. A sign warns people that a hazard exists. It does not remove it. If a sign is out every day in winter, it is a symptom of a problem that is not being fixed.
Where does winter risk concentrate?
The CHIMES framework helps you see what is driving risk in each zone:
- Contamination: rainwater, melted snow, mud, leaves and condensation
- Heel: wet-weather footwear, which varies hugely and cannot be controlled
- Individual: who is exposed, and what they are carrying
- Maintenance: cleaning products, methods and timings, and whether floors are left damp
- Environment: weather coming in, lighting, ramps, steps and external paths
- Surface: the floor material and its measured slip resistance
Not every zone carries the same risk. In most estates, the areas to watch are entrances and lobbies, external paths and steps, corridors on the main wet routes, areas near toilets and kitchens, and transitions between different flooring types.
How do you know whether your floors will cope?
By measuring them. Slip resistance is assessed using pendulum testing, the method preferred by the HSE and relied on in UK slip litigation. It produces a Pendulum Test Value (PTV), and a PTV of 36 or above is generally regarded as low slip potential. Below that, risk rises as the number falls.
Test the priority zones wet as well as dry. A dry reading says little about how an entrance will perform in the rain. Floors also change over time, so a result from last winter does not tell you how a floor performs today.
Slip Safety Services has found that organisations who measure first and then act on what they find see a 57%+ average reduction in slip incidents. The improvement comes from fixing real causes in the right places, rather than adding signs.
Why does acting before winter matter?
Acting early gives you choices. If a zone tests poorly in October, you have time to adjust cleaning, improve matting or treat the surface, and to plan the work around your operations. If you find out in January, after an incident, the options are narrower and the pressure is higher.
Prevention is an investment, not an expense. A modest, targeted check before winter is usually easier to justify than dealing with the consequences of a fall. No outcome can be guaranteed, but dated test results also show that you looked and acted, which matters if a slip is ever questioned. This is general information, not legal advice, so check what applies to your estate with your health and safety adviser.
What to do about it
Before the weather turns, list your wettest and busiest zones and rank them. Find out when each was last tested, and whether the test was done wet. Check that entrance matting is large enough, in good condition and covers where feet are wettest.
Then review cleaning products and methods with your cleaning team or contractor, and check lighting at entrances and external paths. Record near misses and minor slips, so you have real data. Where there is no recent, dated reading for a high-risk zone, treat that as the first gap to close.
Next step
If you are not sure whether your floors are ready for winter, the Slip Prevention Scorecard takes under four minutes per building and gives you a clear starting point, with a score for each of the six CHIMES factors. For the fuller method behind measuring, improving and proving floor grip, Slipology by Christian Harris covers the process in depth.
Related questions
- How do facilities teams prepare floors for winter?
- Does rain actually make floors more slippery?
- How much entrance matting do you actually need in winter?
- Why do train station floors get so slippery in wet weather?