Cleanroom Floor Walkthrough Checklist: What to Check and What to Write Down

By Pablo Figueroa · November 11, 2026 · 4 min read

Cleanroom teams audit air, particles and gowning on a schedule. The floor tends to get attention only when something fails. A short, repeatable walkthrough gives you a record to compare against, so a small defect is a line in a log and not a surprise.

What does a cleanroom floor have to do?

The documents that describe it keep saying the same few things. FDA's 2004 guidance on sterile drug products made by aseptic processing says floors, walls and ceilings should be smooth, hard surfaces that can be easily cleaned, and names seamless, rounded floor-to-wall junctions as an example of good design. EU GMP Chapter 3 asks for interior surfaces that are smooth and free from cracks and open joints, do not shed particles, and allow easy cleaning and, where needed, disinfection.

Those texts are written for drug manufacturing. Your quality team decides which apply to your site.

What should you check, in order?

1. The edges. Look at every place the floor meets something else: walls, door frames, drains, equipment bases. Sika, a coatings maker, says in a white paper that floor-to-wall details should show a cove of at least four inches with a smooth, sealed interface. That is one maker's view. For your own floor, note any hard corner, gap, crack or line of caulk that has lifted.

2. Joints and cracks. A 2016 technical bulletin hosted by the NIH Office of Research Facilities says all joints shall be sealed. Mark each joint and crack on a plan and record whether it is sealed, open or chipped.

3. Drains. EU GMP Chapter 3 calls for drains of adequate size with trapped gullies, and says to avoid recesses that are hard to clean. Look at the frame where it meets the floor, and at whether water has a path to the drain or sits beside it.

4. The surface. Check for dull areas, pitting, soft spots, blisters and color change. Note where each one sits.

5. The cleaning list. The NIH-hosted bulletin says surfaces should not react with cleaning agents or degrade. Ask your coating provider for a written list of what the floor system is rated for, and compare it to what your cleaning team uses today. If your program changed, find out whether anyone told the floor maker.

How should you record it?

Use one log. For every finding, write the location (a grid square or room name), the date, a one-line description, a photo number and the action: urgent, next shutdown or watch. Mark each finding on the floor plan. Next walk, repeat the same route and compare.

What will the walkthrough not tell you?

It will not tell you your room's classification. Sika notes that cleanliness levels are based on particle count, controlled mainly through air handling, so a floor walk cannot replace air testing. It also does not tell you whether the floor meets any regulation. It points to where a closer look is needed.

How often should you do it?

The sources we reviewed give no schedule for floor walks, so set one with your quality team. Tying the walk to a planned shutdown and repeating it on the same cycle is a practical starting point.

How does DTI help?

DTI will look at your photos and floor plan, or walk the floor with you, and tell you plainly which findings can wait and which cannot. A free floor-condition assessment is listed on our home page.

Planning a floor walk at a pharma or cleanroom site? Request a free floor-condition assessment or call (209) 879-9674.

Sources: FDA, Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing (2004, archived copy); EU GMP Chapter 3, Premises and Equipment; NIH Office of Research Facilities technical bulletin, "Construction Features and Interior Finishes in cGMP and Pharmacy Compounding Facilities" (Issue 50, March 2016); Sika, "Pharmaceutical Product Envelope Systems" white paper; DTI home page.

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Featured image: AI-generated illustration of a cleanroom floor walkthrough, not a photograph of a completed DTI project.