Wet Slip Resistance Testing for Grocery Floors: What to Require

By Alexi Cortez · October 1, 2026 · 3 min read

AI-generated grocery floor illustration; illustrative, not a documented DTI project.

A dry slip-resistance number on a flooring data sheet is real, but it answers a narrower question than most grocery facility teams assume. Here's what wet testing actually covers and why it belongs in every grocery flooring spec.

Why isn't a dry slip rating enough?

Because the mechanism that provides traction - surface texture engaging with a shoe sole - behaves differently once water, produce debris, or cleaning residue enters the picture. A coefficient of friction that looks strong dry can drop meaningfully once wet, and a grocery store has multiple zones that are wet on a predictable, recurring basis. A spec that only cites a dry number has specified less than half of what the floor needs to prove.

Which zones actually need wet testing?

Produce and floral, where misting creates scheduled wet conditions. Entrances and vestibules, where rain and snow track in seasonally but predictably. Dairy and refrigerated cases, where condensation forms in a narrow band right where customers reach for product. Frozen and ice cream aisles, where frost and cold surface temperatures change footwear grip. Any wash-down or prep area that connects to customer-accessible space.

How often should testing be repeated?

On a periodic interval, not just once at installation. Foot traffic polishes textured surfaces over time, and cleaning chemistry can degrade the texture that provides friction. A floor that tested well when new can test differently after a few years of service - a one-time test is a snapshot, not an ongoing position you can rely on.

What does a defensible testing program actually require?

Three things together: testing performed under representative wet conditions using a recognized standard, testing repeated periodically rather than once, and documentation - dates, methods, specific locations tested - retained somewhere a facility team can actually produce it. Missing any one of the three weakens the position considerably, and missing documentation in particular reads the same as no testing having happened at all.

Can cleaning products affect slip resistance?

Yes, and this is the connection most facility teams miss entirely. Some cleaning chemicals leave a film that fills surface texture over time, effectively smoothing a textured floor and reducing the friction it was specified to provide. A floor can fail a test it passed at installation with nothing about the flooring itself having changed - only the maintenance chemistry. Slip resistance and cleaning chemistry need to be part of the same specification conversation, not treated separately.

How DTI approaches slip resistance for grocery and retail floors

We test wet-condition performance zone by zone rather than relying on a single store-wide number, build periodic re-testing into ongoing maintenance recommendations, and verify that specified cleaning chemistry won't undo the texture a floor was installed with.

For the full framework connecting slip resistance to liability exposure, see this week's edition of The Floor Front, our LinkedIn newsletter.

Need wet-condition slip testing for a grocery or retail space? Request a free consultation or call (209) 879-9674 - we'll test the zones that actually matter.