Where does bacteria actually hide on an industrial floor?

Bacteria on an industrial floor does not hide in the middle of the floor. The open field is the easiest part of the room to clean and it gets cleaned every shift. What survives is in the places a hose cannot reach and a squeegee cannot cross: the sharp corner where the floor meets the wall, the gap under a machine foot, and the control joint that has opened up.

Those three details account for most of what gets written up in an audit on a floor that is otherwise in good condition. They are the details we treat as core scope on utility and process room floors, not as extras. They are also the three details most often left out of a floor repair scope, because none of them looks like floor work.

Why is the wall-to-floor junction the worst spot in the room?

Because it is a 90-degree internal corner in a room that is washed down, power-washed and effectively flooded on a regular schedule. Water and dirt collect in the corner and stay there. Pressure washing pushes material into it as often as it removes material from it.

The answer is coving — a sloped fillet formed at the junction, typically up to about three inches at roughly 45 degrees, finished in the same system as the floor. It removes the corner entirely. Water runs out instead of sitting, dirt has nowhere to lodge, and the junction can be cleaned in one pass with no seam between wall and floor for anything to get behind.

That last point is why coving is formed rather than installed as a separate trim. A trim strip introduces exactly the joint you were trying to eliminate.

What is the problem with machine feet?

Tanks and process equipment sit on plinths with levelling feet, and the levelling adjustment leaves a gap between the foot and the floor. That gap is dark, permanently damp and impossible to clean or inspect properly. It is the single most overlooked contamination point in a plant.

Sealing around the foot closes it. Once the tank is levelled, a coating is formed around the base so there is no route underneath — nothing can get in, and a glance is enough to confirm the area is clean rather than requiring somebody to get down and look.

At a food-processing plant in south Etobicoke we have done close to forty of these, and none of them has failed.

What makes that number mean something is what came before it. Whatever was being used around the feet previously was not holding for four months — and, as our superintendent puts it, four months is being generous. The detail was not the problem. The material and the application were.

Why do control joints open, and why can’t they simply be filled?

Uneven loading. Put a five thousand gallon tank on one side of a slab and nothing on the other, and the imbalance works the joint far harder than the designer expected. The joint stops doing its job and becomes a channel collecting everything the floor is washed with.

Filling it with a rigid material does not fix it. The joint still moves, so the fill cracks along the same line and you are back where you started, except now the crack is harder to see. What works is routing the joint out first and filling it with a material that can accommodate the movement while staying sealed — so the joint keeps functioning as a joint without being open to contamination.

The same reasoning applies to the cold joints where floor meets wall in these buildings, which is where a lot of water gets in before anyone notices. We rebuilt over 220 linear feet of exactly that detail at this plant, described in the write-up of cold joint repair and waterproofing under the pipes.

Does any of this apply to a condominium?

More than most property managers expect, and this is where the transfer is genuinely useful.

Coving is not strictly necessary in a garbage or compactor room, but we recommend it and install it regularly, because it makes the room dramatically easier to clean. Those rooms get hosed down like a plant does, and they have the same sharp corner holding the same material. Superintendents notice the difference quickly, which is why it has become a normal part of our garbage and compactor room work.

The floor itself follows the same logic — leachate from a compactor needs to leave the room quickly, which is why we also re-slope those floors rather than just re-coating them, for the reasons set out in why water ponds on a plant floor.

Our view: if a floor scope in a wash-down room covers only the open floor area, it is a scope that will pass on the day and fail at the next inspection. The corners, the machine feet and the joints are where the room is actually judged. Full detail on the systems we use is on our floor coatings page, and related questions from property and facility managers are on our FAQ page.