Polyurethane Screed Flooring: The Complete UK Guide
Polyurethane screed is one of the toughest resin flooring systems in general use: a trowel-applied floor, typically 6 to 9mm thick, that shrugs off steam cleaning, hot oil, aggressive chemicals and heavy traffic that would destroy a standard epoxy. It is a default floor for the demanding areas of the UK food and drink industry for exactly that reason. Also sold as PU cement, polyurethane cement or cementitious urethane – the same family, though formulations vary by maker – it costs more than epoxy and is overkill for many floors, which is what this guide helps you judge.
Key takeaways
- PU screed is built for punishment. Thermal shock from steam and hot wash-downs, fats, acids and heavy traffic – the conditions that push epoxy floors past their limits are its home ground.
- PU cement and cementitious urethane are the same thing. Polyurethane resin blended with cement and aggregate, trowel-applied at 6-9mm (heavy duty up to 12mm).
- It dominates wet food and drink production. Breweries, dairies, bakeries, meat and ready-meal plants specify PU screed for their process areas almost by default.
- It tolerates more substrate moisture than epoxy. PU screeds can often go onto younger or damper slabs where epoxy would need extra treatment.
- The finish is functional, not decorative. A matt, textured, workmanlike surface in a limited colour range – specify epoxy where looks lead.
What is polyurethane screed?
Polyurethane screed is a heavy duty resin flooring system that combines polyurethane resin with cement powders and graded aggregates. Mixed on site and applied by trowel or screed box, it cures into a dense, matt-textured floor that behaves less like a coating and more like an engineered surface – which is why the trade names include PU cement and cementitious urethane. These are the same broad family, though the exact binder chemistry, ratios and performance vary between manufacturers.
Standard systems go down at 6 to 9mm and heavy duty builds go up to 12mm for the hardest service. That mass is what buys the system’s signature ability: resistance to thermal shock. A standard epoxy floor hit daily with 80C wash-downs will typically debond over time as the surface expands and contracts against the concrete below; a PU screed’s cementitious make-up, its toughness and a thermal expansion closer to concrete’s let it ride those cycles for years.
Despite the name it is not a levelling layer – it is a distinct heavy duty resin category, applied by a screeding method but engineered for performance rather than to correct levels. Like any resin system it needs a sound, prepared slab beneath it and where levels need correcting first, that is a job for conventional screeding before the resin goes down.
Where is polyurethane screed used?
- Food and drink production. The core market: bakeries, dairies, breweries, meat and fish processing, ready-meal plants. Hygienic, seamless, steam-cleanable and well suited to facilities operating a HACCP food safety system.
- Commercial kitchens. Hot oil, hot water, constant cleaning – the domestic-scale version of the same problem.
- Chemical and pharmaceutical plants. Broad chemical resistance, often better than epoxy against the organic acids and caustics common in these environments – always checked against the actual chemical exposure.
- Wet process areas generally. Anywhere floors are washed down hot and often, PU screed outlasts the alternatives.
- Heavy engineering and workshops. Where impact and point loads exceed what a 2-3mm epoxy can absorb.
The quick comparison
| PU screed | Epoxy | |
|---|---|---|
| Typical thickness | 6-9mm (up to 12mm) | 2-4mm |
| Max surface temperature | 120C+ at full thickness (system-dependent) | Around 60C (standard grades) |
| Chemical strengths | Organic acids, fats, caustics | Many acids and solvents |
| Appearance | Matt, functional, limited colours | Gloss, unlimited colours |
| Material cost | Higher | Lower |
| Time to service | 24-48 hours | Up to 7 days |
| Best for | Food production, hot wash-down | Dry commercial, decorative |
Polyurethane screed vs epoxy
Temperature. The deciding factor in most specifications. Standard epoxy typically tolerates surface temperatures to around 60C; full-thickness PU screeds handle 120C plus, though exact ratings are system- and exposure-dependent, which is what steam cleaning and boiling spillages demand. If the cleaning regime involves steam or very hot water, the epoxy option effectively disappears – the detail is in our comparison of polyurethane vs epoxy for food production.
Chemical resistance. Both resist a wide range, but they fail differently: epoxy is strong on many acids and solvents, while PU screed is notably better against organic acids (lactic, citric – food chemistry) and fats. This is a data-sheet decision made against the actual substances on your floor.
Appearance. Epoxy wins. Gloss options, unlimited colours and decorative finishes belong to systems like self-levelling epoxy; PU screed offers a modest palette of matt, functional colours.
Cost. PU screed costs more – more material at greater thickness, applied by a specialist trowel gang. Where its resilience is not needed, epoxy gives a better-looking floor for less. Where it is needed, buying epoxy twice costs more than buying PU screed once.
Programme. PU screeds often cure to service faster than standard epoxy – many systems take traffic in 24 to 48 hours, though fast-curing epoxies exist. For genuinely compressed overnight programmes, MMA flooring remains the speed benchmark.
How is a PU screed floor installed?
1. Preparation. Diamond grinding or shot blasting to a clean, keyed surface; repairs to cracks and defects. At 6-9mm of dense material the system is only as good as its grip on the slab.
2. Detailing. The part that separates specialists: coving up walls and plinths, sealing at drainage channels and gullies and forming falls so water actually leaves the floor. In food environments this detailing is most of what an auditor looks at.
3. Priming or scratch coat. Depending on the system and slab condition.
4. Application. The screed is mixed and laid by trowel or screed box in a continuous, planned sequence, textured to the specified slip resistance.
5. Curing. Foot traffic typically within 24 hours, full mechanical and chemical service within 48 hours to a few days by system.
Is polyurethane screed right for your floor?
If your floor faces heat, steam, fats or aggressive chemistry – or an audit regime that demands seamless, coved, cleanable surfaces – PU screed is usually the right answer and often the only durable one. If your floor is a warehouse, showroom or light production area that stays at room temperature, it is more system than you need and epoxy will do the job for less with a better finish. The specification comes down to your cleaning regime, temperature, chemistry, traffic and slab – which is what the site survey establishes.
Frequently asked questions
What is the difference between PU cement and polyurethane screed?
None – PU cement, polyurethane cement, cementitious urethane and polyurethane screed are trade names for the same family: polyurethane resin blended with cement and aggregate, trowel-applied as a heavy duty floor.
How thick is a polyurethane screed floor?
Typically 6 to 9mm for standard duty and up to 12mm for the heaviest service. Thinner PU systems around 3-4mm exist for medium duty areas that still need thermal performance.
Can a polyurethane screed take steam cleaning?
Yes – thermal shock resistance is the system’s defining strength. Full-thickness PU screeds tolerate steam and hot wash-downs at temperatures that would debond an epoxy floor.
How long does a PU screed floor last?
In hard service, typically 10 to 20 years – often among the longest-lived resin options in aggressive environments. Substrate preparation, detailing quality and maintenance decide where in that range a floor lands.
Is polyurethane screed food safe?
Cured PU screed is stable, non-tainting, seamless and cleanable, which is why it is a standard specification across UK food and drink production. Taint-free formulations are available for sensitive environments such as breweries and dairies.
Can PU screed be laid on new concrete?
Sooner than epoxy, in many cases – PU screeds tolerate higher substrate moisture, so they can often go onto younger slabs. Moisture is still measured and confirmed at survey rather than assumed.
Get the right system specified
Matching the system to the punishment your floor actually takes is the difference between a floor that lasts decades and a repeat failure. Tell us about your environment and we will arrange a free site survey with a vetted specialist contractor from our network. The contractor provides a written quotation, typically within 48 hours with no obligation. Contact us to get started.