Polyurethane is one of the most useful and most misunderstood materials in commercial flooring. It can be a thin, tough topcoat over epoxy, a flexible waterproofing membrane, or a thick cementitious floor for hot, wet plants. This guide explains what polyurethane flooring is, where each type fits, and what to ask before you choose.
What polyurethane does that epoxy does not
Flexibility: epoxy is hard and rigid. Polyurethane stays slightly flexible, so it handles small movement, impact and temperature swings without cracking.
UV stability: aliphatic polyurethane does not yellow or chalk in sunlight the way epoxy does, which matters near loading doors, windows and glass storefronts.
Abrasion and scratch resistance: polyurethane topcoats wear better under wheeled traffic, pallet jacks and foot traffic.
Chemical resistance: it resists many cleaners, oils and salts, and is easier to keep looking clean.
Three ways polyurethane shows up on a floor
Polyurethane topcoat over epoxy: the most common use. Epoxy builds thickness and bond, and a polyurethane topcoat protects it from scratching, UV and chemicals. This is the standard system for showrooms, warehouses, shops and retail.
Polyurethane membrane: a flexible, liquid-applied layer that waterproofs and bridges small cracks. Used on balconies, decks, ramps and parking structures. See our guide to polyurethane membranes.
Polyurethane cement (urethane concrete): a thick, heavy-duty system for wet processing areas, kitchens and freezers. It handles boiling water and thermal shock that cracks ordinary epoxy.
Where polyurethane is the right choice
Areas with sunlight, where epoxy would amber over time
High-traffic floors where scratching shows, like showrooms and clinics
Medical and clinic floors that need a seamless, easy-to-clean surface
Decks, ramps and balconies that need to flex and stay waterproof
Washdown and freezer areas, with polyurethane cement
Where to be careful
Moisture: polyurethane is sensitive to moisture during application. Moisture in the slab can cause bubbling, so concrete moisture testing comes first.
Prep: like any coating, it only lasts as long as the bond. The slab should be ground or shot blasted and repaired before anything goes down.
Odour: some systems have a noticeable odour while curing. Plan ventilation in occupied buildings, or ask for a low-odour option.
Cost: a polyurethane topcoat adds material and labour, but it often pays for itself by delaying recoats.
Questions to ask your contractor
Which polyurethane is it: topcoat, membrane or cement? They are very different products.
Is it aliphatic (UV-stable) or aromatic?
How will the slab be tested for moisture and prepared?
What is the total thickness and number of coats?
What is the cure time before foot and vehicle traffic?
What does the warranty cover?
Get the right polyurethane system
Hardbond installs polyurethane topcoats, polyurethane membranes and polyurethane cement across Toronto, the GTA and Ontario, with a 3-year written warranty. Book a floor assessment and we will specify the right system for your slab and your use.
