Food processing plant flooring: hygiene, coving, drains and safety

A food plant floor must be seamless, free of open joints, easy to wash and sanitize, joined to the walls with a coved base, sloped to drains, slip resistant even when wet and resistant to washdown chemicals and hot water. Urethane cement is the most common system in wet areas, epoxy in dry areas, and installation is usually planned during a production shutdown.

In a food plant, the floor is part of the sanitation program. A crack, an open joint or a puddle that does not drain holds water and residue, and becomes a contamination point that the auditor will flag. This guide is for maintenance, quality and project managers in Quebec and Ontario preparing to redo a processing room, a dock or a cooler.

What hygiene requirements must a food plant floor meet?

The floor must be smooth or of controlled texture, impervious, seamless and easy to clean, with no area where water and residue collect. The Safe Food for Canadians Regulations require surfaces designed and maintained to prevent contamination; the plant's sanitation program and its auditor then set expectations for each room.

Translated into flooring, these requirements mean:

• Continuity. No tiles with open joints and no cracks: the coating forms a seamless surface, with expansion joints carried through and sealed with a suitable flexible product.
• Imperviousness. Water must not pass through to the slab, or it collects there and debonds the coating from below.
• Cleanability. The anti-slip texture must not be so aggressive that it traps residue that washdown cannot remove.
• Clean details. Equipment bases, plinths, drains and pipe penetrations are all places where dirt lodges if the detail is poor.

Urethane cement and epoxy meet these requirements in different ways; our comparison of epoxy, polyurethane and polyurea flooring presents the main resin families.

Why is a coved base essential?

A coved base removes the right angle between floor and wall, where water stands and residue escapes washdown. It forms a rounded, continuous transition, in the same system as the floor, that cleans in a single pass and protects the bottom of walls from forklift impact and washdown water.

Design points to settle:

• Height. Chosen based on washdown splash height and wall type; it is set in the specification, room by room.
• Radius. Open enough to be cleaned easily, with no crevice.
• Termination at the wall. The top of the cove ends cleanly and is sealed to the wall (concrete, block or insulated panel) so water does not get behind it.
• Plinths and bases. Equipment plinths receive the same cove as the walls.

A poorly terminated cove becomes a water trap itself. It is installed at the same time as the floor, by the same crews.

How should slopes and drains be handled?

The floor must carry all washdown water to the drains, with no remaining puddles. If the slab lacks the required slope, it is rebuilt with a sloping screed before coating; if drains are poorly located or damaged, they are corrected before anything is installed.

• Slopes. Designed with the drain layout and forklift traffic in mind; the selected slope is set in the specification based on use and ease of travel.
• Drains. The joint between the coating and the drain body is the most common weak point. The coating anchors into a groove around the drain, and the drain must be a sanitary model compatible with a watertight detail.
• Trench drains. Trench edges get the same care as drains, with continuous anchoring and termination.
• Verification. A flood test before the final coat reveals puddles to correct.

Slab cracks are repaired before installation, by concrete crack injection where needed, as part of concrete protection.

How much slip resistance does each area need?

Slip resistance is set zone by zone: more texture where the floor stays wet or greasy, less where cleaning comes first and the floor stays dry. The choice balances worker safety against ease of cleaning, and it is confirmed on a sample before installation.

Slipperiness can be measured, for example with ANSI A326.3 for the wet dynamic coefficient of friction. Our article on anti-slip industrial flooring explains how texture is adjusted (aggregate, broadcast, topcoat).

Which washdown chemicals must the floor withstand?

The floor must withstand alkaline detergents, acid descalers, sanitizers and the organic acids in food, often combined with hot water. The actual list of plant chemicals, with their concentration and use temperature, is compiled and compared with the chemical resistance table of the selected system.

• Alkaline detergents and degreasers. Used daily, often hot.
• Acid descalers. Harder on some resins, especially when hot.
• Sanitizers. Chlorinated compounds, peroxides, quaternary ammonium compounds: resistance varies with product and concentration.
• Organic acids from food. Milk, blood, sugars, vinegars, juices: urethane cement generally resists them better.

A generic resistance table is not enough: it is the combination of product, concentration, temperature and contact time that matters. The manufacturer's data sheet and, if needed, a sample test decide.

How is the work done during a production shutdown?

Work is planned by zone and by shutdown window, with sequencing that accounts for concrete preparation, cure times and cleaning before restart. The work area is physically separated from production areas that stay active, dust and odours are controlled, and return to service is planned with the quality team.

Usual steps:

1. Survey. Slab condition, moisture (for example per ASTM F2170), slopes, drains, washdown chemicals and shutdown schedule.
2. Preparation. Removal of the old coating, shot blasting or grinding to the specified CSP per ICRI 310.2R, anchor grooves, repairs.
3. Installation. Sloping screed where needed, coved base, main layer, drain details, topcoat.
4. Inspection. Thickness, texture, drainage, appearance, recorded in the log.
5. Return to service. Per data sheet cure times, followed by full cleaning before production.

A cooler cannot always be warmed up; a cold-suited product and the precautions in our article on cold weather application then apply. Slab moisture is also checked, as explained in our article on concrete moisture. Our project management service coordinates sequencing with production.

How do you prepare for a quote?

A good quote starts with a floor plan, the use of each area, the list of washdown chemicals and the available shutdown windows. With these, we propose the system, thickness, texture, coving and drain details, and sequencing.

Cost factors (area, slab condition, slopes to rebuild, cove length, number of drains, access, night or weekend work) are covered in our article on industrial epoxy flooring cost. Our industrial epoxy flooring service also covers urethane cement and is part of our protective coatings work. Our crews and qualified subcontractors work from LaSalle, including in Montérégie, Mauricie and Centre-du-Québec and the Quebec region. Send photos and a floor plan through the request a quote form: pricing on consultation, reply within 24 business hours.

Frequently asked questions

Can existing tiles be kept and coated over?

It is rarely recommended in wet areas. Tile joints and cracked tiles hold water under the new coating. Tiles are generally removed and the concrete repaired to get a sound substrate.

Does the whole plant have to be done at once?

No. The work is divided into zones based on shutdown windows. Transitions between zones are planned to avoid a weak joint in the middle of a washdown room.

Does the floor have to be approved by the food inspection agency?

The plant is responsible for the compliance of its facilities. We provide the data sheets and manufacturer documents on incidental food contact, so the quality team can add them to its file.

What if a drain leaks under the floor?

It is located before the work, with a flood test or an inspection, and repaired before installation. A new coating over a leaking drain debonds from below.