What Is Polyurea?

Polyurea is a high-performance, elastomeric coating created through the rapid chemical reaction of isocyanates and synthetic resins. Applied using a specialized hot spray system, this seamless, fast-curing membrane has become a technical marvel in modern waterproofing systems. Its unique chemistry and physical properties set it apart from all other waterproofing systems. Polyurea’s proven pedigree in these demanding industries demonstrates its exceptional strength and reliability, making it the ideal solution for clients seeking long-lasting protection in flat and low-slope roofing, deck coatings, and roof renovation projects.

The Chemistry Behind Polyurea

At its core, polyurea is the result of a reaction between an isocyanate component and an amine-terminated resin blend. Unlike conventional coatings that rely on slower curing processes, polyurea's chemical reaction occurs almost instantaneously. This fast reaction time allows it to cure within seconds, even in extreme humidity or temperature conditions, making it highly versatile and efficient on job sites.

Key Technical Benefits

Rapid Curing and Installation

Polyurea’s ability to cure in under a minute ensures quick project turnaround, reducing labor costs and minimizing disruption. This feature is particularly valuable for large-scale projects or when downtime must be kept to a minimum.

Seamless Application

Applied as a liquid, polyurea forms a seamless membrane that adheres fully to the substrate. Unlike traditional sheet-based systems, there are no joints or seams—the primary sources of leaks in many roofing and waterproofing failures.

High Flexibility and Crack Bridging

One of the standout characteristics of polyurea is its elasticity, allowing it to stretch and contract with structural movement. This flexibility ensures that it maintains waterproof integrity even when the underlying substrate expands, contracts, or shifts.

Chemical and Abrasion Resistance

Polyurea is highly resistant to chemicals, oils, and environmental exposure. Its tough, abrasion-resistant surface makes it ideal for areas prone to mechanical wear, such as parking decks or industrial environments.

Adherence to Various Substrates

Polyurea excels in applications such as flat roofs, decks, balconies, and below-grade waterproofing. Its exceptional durability reduces maintenance needs and extends the life of the protected structure, making it a cost-effective solution over time.

Applications and Longevity

Polyurea is highly versatile and customizable, and has been used for decades in a variety of demanding sectors, including industrial, petrochemical, mining, infrastructure and even military Here at Westeco Coatings, we have taken what used to be reserved for multi-million dollar engineered technical projects and brought it into the realm of residential and commercial construction - and at a price competitive with traditional products! Polyurea excels in applications such as flat roofs (on both new builds as well as over existing traditional membranes), decks, and as below-grade waterproofing. Its exceptional durability reduces maintenance needs and extends the life of the protected structure, making it the modern choice for your build.

Strips of plywood were laid over this roof to create battens. We also installed custom gutter with a lip that went up onto the roof surface, and then sprayed polyurea over everything to make a truly seamless membrane from outer edge to outer edge. No other roofing system can do that!

Conclusion

With its advanced chemistry, fast application, and long-lasting performance, polyurea stands out as a technically superior waterproofing material. For builders and property managers seeking efficient, durable roofing membrane, polyurea offers a future-proof solution.