Urethane cement vs epoxy flooring: which industrial floor to choose?

Urethane cement is generally the better choice when the floor sees thermal shock, hot water or steam washdown, damp concrete or the conditions of a food processing plant. Epoxy remains a sound choice in dry areas with stable temperatures (warehouses, workshops, technical rooms, chemical containment), where it gives a smooth, decorative and easy-to-clean finish.

Both systems protect concrete and can be installed in an operating plant, but they react differently to heat, water and moisture in the slab. Choosing the wrong one shows quickly: delamination around drains, surface cracking, blisters over a damp slab. This guide helps maintenance managers and project managers in Quebec and Ontario decide, alongside our comparison of epoxy, polyurethane and polyurea flooring.

What sets urethane cement apart from epoxy?

Urethane cement is a hybrid mortar (polyurethane resin, cementitious binder and aggregate) whose thermal behaviour is close to that of concrete, while epoxy is a stiffer resin that forms a hard, smooth film. That difference in behaviour explains almost every choice that follows.

• Urethane cement. It expands and contracts roughly like the slab, which limits stress at the bond line when temperatures swing. It generally tolerates higher residual moisture in the concrete and resists many organic acids found in food (milk, blood, sugars, fats).
• Epoxy. It bonds very strongly to prepared concrete, offers high hardness and a good range of chemical resistance. It copes poorly with repeated thermal shock and with moisture rising from the slab.

Our crews and qualified subcontractors install both, as part of our industrial epoxy flooring service, which also covers cementitious systems.

Which system best resists thermal shock and hot water washdown?

Urethane cement resists thermal shock and repeated hot water or steam washdown far better. When very hot water, cooking oil or steam hits a cold floor, or a cooler is washed down hot, the difference in expansion between a stiff resin and concrete creates stress that eventually cracks or debonds an epoxy.

Situations that point toward urethane cement:

• daily hot water or steam washdown, followed by a cold water rinse;
• hot spills: cooking, frying, sterilization, clean-in-place discharge;
• coolers, freezers and refrigerated docks, where the slab stays cold and the surface is cleaned hot;
• forklift routes between hot rooms and cold rooms.

Temperature limits vary by formulation and thickness: they are found in the manufacturer's data sheet, not in a generic table. In dry areas with stable temperatures, this extra resistance adds nothing and epoxy remains a valid choice.

What if the concrete is damp or new?

If concrete moisture exceeds what an epoxy tolerates, urethane cement is often the answer, because it generally accepts higher residual moisture. Measure before choosing, though: poorly assessed moisture remains the leading cause of blistering and delamination on slabs.

Recognized methods are in-situ relative humidity probes per ASTM F2170, the calcium chloride moisture vapour emission rate per ASTM F1869 and, as a screening check only, the plastic sheet test per ASTM D4263. The limits to meet come from the data sheet of the selected system. Our article on concrete moisture before epoxy coating covers these tests.

A slab on grade without a vapour barrier, recently poured concrete or a thawing cooler slab are typical cases where urethane cement, or a moisture-mitigating primer under epoxy, should be considered.

Which floor suits a food processing plant?

In food processing plants, urethane cement is the most common choice in wet processing areas, while epoxy is found more in dry areas: packaging, storage, laboratories and corridors. The table below summarizes generally recognized trends; the data sheet and the specification decide for each room.

A food plant floor must also be smooth and free of open joints where hygiene requires, meet the walls with a coved base and drain toward floor drains. These details matter as much as the choice of resin and are settled before installation, during the site survey.

What thickness and finish should you plan for?

Urethane cement is installed as a heavy layer, by trowel or rake, while epoxy ranges from a thin roller-applied film to a heavy mortar depending on use. Thickness is chosen based on load, traffic, temperature and washdown severity, then set in the system data sheet.

• Thin film. Roller-applied epoxy for a dry area with light traffic: controls dust and eases cleaning, without resisting impact or heat.
• Self-levelling layer. Poured epoxy or urethane cement, for a seamless finish and medium traffic.
• Heavy mortar. Trowelled urethane cement or filled epoxy, for heavy traffic, impact, hot water and aggressive washdown.

A textured finish improves footing but is slightly harder to clean. The right balance depends on slip risk: our article on anti-slip industrial flooring explains how to set it.

How is the concrete prepared for each system?

Both systems require mechanical preparation of the concrete (shot blasting or diamond grinding) to remove laitance and open the surface to the specified profile, expressed as a CSP per ICRI 310.2R. Urethane cement also requires anchor grooves at the perimeter, saw cuts at pour stops, drains and thresholds, to hold the layer in place.

• Repairs. Cracks and spalls are repaired before installation; active cracks are handled by concrete crack injection or a flexible joint.
• Joints. Slab expansion joints are carried through the floor, otherwise they crack the layer.
• Contamination. Absorbed oil, grease and washdown residue must be removed, or adhesion is compromised.

These steps fall under concrete protection in the broad sense, and fit into our protective coatings work when the floor is part of a larger project.

How do you plan the work and get a quote?

Work is planned around the shutdown window, the cure time before return to service and zone sequencing, because the whole plant cannot always close. Both systems give off odours during installation: ventilation and separation from food areas are planned with production. Our project management service coordinates this sequencing during shutdowns.

We work from LaSalle, including in Montreal, Montérégie and Ontario. Cost factors (area, concrete condition, thickness, coving, drains, access and schedule) are covered in our article on industrial epoxy flooring cost. Send photos, a floor plan and room use through the request a quote form: pricing on consultation, reply within 24 business hours. We install industrial, commercial and institutional floors only, not residential garages.

Frequently asked questions

Can urethane cement go over an old epoxy floor?

Not directly in most cases. Urethane cement must anchor into sound, prepared concrete; an old epoxy is generally removed by grinding or shot blasting. Compatibility is checked against the data sheet and, where needed, with an adhesion test.

Is urethane cement more expensive than epoxy?

Cost depends mostly on thickness, preparation, coving and drains, more than on the resin itself. A thin epoxy film and a heavy urethane cement mortar cannot be compared directly, so pricing is on consultation, room by room.

Why does epoxy crack near drains and ovens?

Because those areas concentrate hot water, temperature swings and moisture. The stiff resin and the concrete do not expand the same way, and the bond line eventually fails. Our guide to coating failure modes helps with diagnosis.

How long before the floor returns to service?

It depends on the product, the thickness and the room temperature. The time is set in the quote from the data sheet, distinguishing foot traffic, forklift traffic and chemical or thermal exposure.