Most falls are argued on the surface alone. The stronger picture comes from the records around it: what the operator's inspection routine required, what the logs show was actually done, how long the condition existed and whether it had appeared before at the same location.
The surface is photographed as found with scale references, measured where dimensions matter, and mapped so each observation ties to the incident location. Moisture readings are taken where a wet condition is alleged, and the matting, drainage, lighting and traffic flow around it are recorded at the same visit.
The analysis shifts to the documentary record: photographs taken at the time, the flooring specification and purchase records, cleaning product records, work orders describing the replacement, and testimony about the prior condition. It is a weaker position than an intact inspection, which is why early involvement matters.
Frequently it decides the case. Many finishes require a specific dilution, pad or rinse step, and a general-purpose degreaser or a skipped rinse can leave residue that changes how the surface behaves once wet. A documented departure from the manufacturer's written instruction is direct evidence.
Within a builder's lane, yes: whether the material and finish specified matched the use, the exposure and the manufacturer's stated suitability. What falls outside is any opinion on design adequacy as a design professional's standard of care, which is referred to a licensed design professional.
On run length relative to weather and traffic, construction suitable for the volume, coverage of the full walking width, and condition at the time. A mat too short to dry footwear, saturated and unchanged, or moved out of the path leaves a hazard the operator believed had been handled.
The paperwork. Repeat work orders for the same location, a complaint history, and inspection logs showing the same note month after month establish a recurring condition the operator knew about. A genuine one-off leaves no such trail, and that difference is usually decisive on notice.
Chicago & Cook County