Published 2026-02-18 · Slip-Tests UK
Why winter is different
UK commercial floor PTV values drop significantly in winter for four distinct reasons:
Water ingress — rain, snow, and wet shoes are tracked onto floors in far higher volumes than in summer. A floor that tests PTV 38 in July can test PTV 22 in December with identical cleaning, identical matting, and identical footfall.
Organic contamination — autumn leaves, grit, salt from gritted pavements, and mud all degrade PTV. External paving and entrance zones are hardest hit.
Temperature cycling — freeze/thaw cycles affect external paving PTV more dramatically than most managers expect. Black ice on external paving can produce PTV readings close to zero.
Cleaning regimes fall behind — in-season cleaning schedules are often set in summer and fail to keep pace with winter contamination.
The core of a winter slip prevention programme
Step 1: winter-specific testing
Summer-only testing produces optimistically high PTV values. A credible programme tests at least once during the October–February period, ideally during or immediately after a wet-weather event, to capture real-world worst-case PTV.
Sites with any historical slip incidents should have winter testing as a matter of policy. The results reveal exactly which zones are at risk and what remediation will have measurable impact.
Step 2: matting specification and depth
Industry guidance consistently shows that 5-6 metres of absorbent entrance matting — measured from the external door — is needed to remove substantially all water from customer shoes in wet weather. Most UK retail and hospitality premises have substantially less. The matting they do have is often partially saturated, providing minimal PTV benefit.
Winter matting requirements are not a single mat — they are a layered system: external grit-removal matting, transition matting, and main-floor absorbent matting, each doing a distinct job.
Step 3: cleaning regime escalation
Winter cleaning regimes should increase frequency in wet weather, switch to appropriate cleaning chemicals (residue-free in customer areas), and include prompt contamination response (wet leaves, spills, tracked grit). Documented cleaning schedules that adjust with weather demonstrate proactive risk management.
Step 4: signage and wet-weather protocol
"Wet floor" signs are a legal signal but not a magical risk mitigation. Signs combined with increased cleaning and active floor monitoring form a defensible protocol. Just-place-a-sign-and-walk-away does not.
Step 5: gritting and salting external paving
For UK commercial premises with external paving exposed to customer or employee traffic, a documented gritting/salting protocol during sub-zero weather is a core HSE expectation. Trigger thresholds (e.g. forecasts below 2°C), responsibilities (which staff, what time), and record-keeping (when gritting occurred, under what conditions) all matter if an incident leads to a claim.
What the HSE expects in winter
The HSE's published guidance on slip prevention does not treat winter as a special case — the same "reasonably practicable" duty applies year-round. In practice, the HSE interprets "reasonably practicable" winter measures to include:
- Documented slip risk assessment that addresses seasonal variation
- Documented testing that includes wet conditions
- Adequate matting at all entrance zones
- Documented cleaning regime adjusted for winter
- Documented wet-weather signage and monitoring protocol
- Documented gritting protocol for external paving where applicable
- Prompt remediation of any zone testing below PTV 25
Absence of any of these significantly weakens a "reasonably practicable" defence if an incident occurs.
The insurance dimension
UK commercial liability insurers are increasingly treating documented winter slip preparation as a rating factor. Brokers often ask at renewal whether testing has been carried out during wet conditions, whether seasonal cleaning regimes are documented, and whether historical slip incidents have been remediated with documented post-remediation testing.
Affirmative answers to all three typically support the best available renewal terms.
Sectors with the biggest winter exposure
Retail and shopping centres — entrance zones are the single highest-risk area. A single wet-weather slip incident in a busy retail entrance can generate outsized claim costs and reputational damage.
Hotels and hospitality — wet-weather lobby entry combined with wheeled luggage is a specific winter risk profile. Pool areas are less winter-sensitive because they are climate-controlled, but surrounding wet circulation areas can deteriorate.
Transport hubs — airports, railway stations, bus interchanges all face extreme winter wet-weather ingress. Multi-zone testing is essential.
Schools and universities — sports halls, canteens, corridors all face winter contamination peaks when indoor footfall is highest.
Hospitals and care homes — elderly and frail users amplify the consequences of any winter slip.
A realistic winter testing timeline
For a UK commercial operator wanting to put winter preparation on a credible footing:
- Late September: commission a pre-winter slip test covering entrance zones and high-traffic areas
- October: address any moderate or high slip potential zones identified
- November–February: operate the documented winter cleaning, matting, and monitoring regime
- January: commission a mid-winter spot test during wet weather to verify real-world PTV
- March: close out the winter, review any incidents, update the protocol for next winter
The bottom line
Winter is when slip incidents peak. Documented winter preparation is how UK commercial operators defend against the claim costs and HSE exposure that come with it. A modest annual investment in pre-winter testing, supported by matting, cleaning, and signage protocols, typically produces a substantial reduction in winter incident frequency — and an even larger reduction in the cost of any incident that does occur.