Documented Slip Testing: The Evidence That Actually Proves Due Diligence
By Walkway Management South Florida
In March 2026, an Osceola County jury awarded a Florida grocery chain’s customer just under $4 million after she slipped on liquid in a beverage aisle. The detail that should make every property owner sit up is not the dollar figure. It is that employees had already cleaned the spot where she fell before the fall happened. The store had done something. It just could not prove it had done the one thing that would have mattered: shown, with dated evidence, what the floor’s actual condition was.
That is the gap this article is about. Not whether you care about floor safety. Almost every commercial property owner does. The question a courtroom asks is narrower and colder: can you prove it, with something more than your own word, after the fact?
What “notice” actually requires you to prove
Most slip-and-fall claims against a commercial property turn on a legal concept called notice. In Florida, Section 768.0755 governs falls caused by a transitory substance like water or a spill, and it requires the injured person to prove the business had actual or constructive knowledge of the hazard and failed to act. Actual notice is straightforward: someone on staff saw it and did nothing. Constructive notice is where nearly every real case lives, and the statute allows it to be shown two ways: the condition existed long enough that reasonable care should have caught it, or the condition happens often enough that it was foreseeable.
Read both of those again. Neither one turns on whether you meant well. Both turn on what you can show about time and pattern. That is what “due diligence” translates to in a courtroom: a record you can produce.
Every state phrases its own version of premises liability differently, and this is not a substitute for advice from your own attorney about your jurisdiction. But the underlying question is close to universal. A plaintiff’s attorney is going to ask what you knew, when you could have known it, and how you would prove either answer. If your honest response is “we’re pretty careful people,” that is not evidence. It is a character reference.
Why a sweep log is not the same as proof
Property owners often reach for the same defense: a cleaning log, a sweep sheet, a checklist someone initials every hour. It feels like documentation, and it is better than nothing. But it proves a narrower thing than most owners think it does. A sweep log shows an employee was present at a location at a time. It does not show what the floor’s actual friction was, whether a film of degraded cleaning residue had built up, or whether the surface still met a wet-traction threshold under the conditions people were actually walking on it. The National Floor Safety Institute has made this point directly at its own litigation symposium: logging alone is not the answer, because presence is not the same as measurement.
A dated ASTM E303 pendulum test or ANSI A326.3 dynamic coefficient of friction test is a different kind of record. It states, in a number, what the floor’s slip resistance actually was on a specific day, tested by someone with no stake in the outcome. That is closer to what “reasonable care” means when a court asks you to show it, because it answers the actual question instead of a related one.
This is also the structure behind ANSI/NFSI B101.8, the industry standard guide for a walkway safety management program. It calls for a named person responsible for floor safety, not a diffuse “everyone’s job” arrangement that, in practice, means no one owns it. It calls for regular inspections on a real interval, not an occasional one. And it calls for the incident review and gap analysis to happen every time something does go wrong, so the next test is informed by the last one. A documented testing program is not a single event. It is the routine that produces a paper trail before you ever need one.
Why the wrong test can fail you in court
Here is the part that gets left out of most articles like this one, and it is the part that matters most if you actually want the protection instead of the appearance of it.
In 2020, a federal court in New Jersey heard a slip-and-fall case against a restaurant chain. The plaintiff’s expert had tested the floor’s dynamic coefficient of friction and found it below the accepted threshold. That should have been strong evidence. It was excluded entirely, and the reason was timing and conditions rather than the measurement itself. The test was performed roughly nine months after the fall, on a different day, and the floor was reportedly covered in a greasy film at the time of the test that no one could tie back to the day of the incident. The court ruled the test did not “fit” the facts of the case under the Daubert standard for expert testimony, because it did not reliably describe the floor’s condition on the date that mattered.
Read that the other way. A test is only strong evidence of due diligence when it actually documents the floor at a relevant point in time, under conditions that can be tied to what a fact-finder needs to know. A single test performed defensively, months late, disconnected from any ongoing record, is exactly the kind of evidence a court can throw out. It is not automatic protection just because a tribometer touched the floor.
That is why a program beats a one-off every time. A property that tests on a routine interval, using pendulum testing, DCOF testing, or both depending on the space, with dated records going back further than any single incident, has something a rushed post-incident test cannot manufacture: a documented pattern of what the floor’s condition normally was. That pattern is part of what a constructive-notice defense rests on, alongside everything else a court weighs — the maintenance history, the inspection log, the layout, and the incident itself. A single defensive test, taken after a lawyer gets involved, invites exactly the kind of Daubert challenge that ended the case above.
What the numbers actually protect, and what they don’t
For pendulum testing, a wet PTV of 36 or above is associated with low slip potential. Under ANSI A326.3, level interior areas expected to be walked on wet should measure a wet DCOF of 0.42 or greater; interior wet-plus areas like locker rooms and indoor pool surrounds go to 0.50; exterior wet areas and anywhere with oils or grease go to 0.55. Under ANSI/NFSI B101.3, a wet DCOF of 0.45 or above is high traction, 0.30 to 0.44 is acceptable, and below 0.30 is low.
None of those numbers, on their own, mean a floor has been certified safe. Slip risk is the surface, the contamination, the cleaning regimen, the footwear, and the traffic pattern, all at once. A passing number is evidence of reasonable care, tested and dated. We never phrase it as a guarantee that nobody will fall. What the record protects you from is the specific legal question of notice: did you know, or should you have known, and did you act like it.
Falls remain one of the most expensive categories of injury this country has. The CDC puts the annual cost near $361 billion, with roughly 9 million emergency room visits, about 1 million hospitalizations, and around 44,000 deaths a year. Somewhere near 65,000 slip-and-fall lawsuits are filed annually. Most commercial properties will face this question eventually, not because they were careless, but because falls happen on well-run floors too. The difference between an owner who is asked hard questions and an owner who has answers is almost always the same folder: dated reports, a named person responsible, and a testing interval that predates the incident instead of following it.
What a defensible program actually looks like
Name someone responsible for floor safety in writing. Test on a routine interval by risk category, not just once at opening. Keep the reports, not just the pass or fail summary: the instrument used, the standard cited, the date, the conditions, and who performed it. Review and re-test after any change to flooring, treatment, or cleaning chemistry, since any of those can move a floor’s wet friction without anyone noticing by eye. And if a fall does happen, do not treat the incident itself as the moment to start testing. By then, the floor’s condition on the day that matters is already gone, and a test taken afterward is vulnerable to the same challenge that sank the case in New Jersey.
We test commercial floors for exactly this purpose: a dated, third-party record using ASTM E303 pendulum testing or ANSI A326.3 DCOF, built into a routine your facility can point to before anyone asks. If you want to know where your properties actually stand, reach out through the contact page and we will walk you through what a testing program looks like for your specific spaces.
This article is informational and describes slip resistance testing practice and general legal doctrine around premises liability and notice. It is not legal advice, and it does not create an attorney-client relationship. Statutes and case outcomes discussed here are specific to their jurisdictions and facts, and the Osceola County verdict discussed above was under appeal as of this writing. Consult your own attorney about how notice and due diligence standards apply to your property and your state.
