Sandwich Panel Roof Waterproofing with Polyurea

Sandwich panel roofs are widely preferred in industrial buildings due to their lightweight structure, fast installation, and cost advantages. However, panel joints, fastener heads, drainage channels, and roof penetrations can become potential leakage points over time. Particularly on large-span factory and warehouse roofs, even a minor leak can spread across extensive areas and result in significant damage.

Polyurea waterproofing for sandwich panel roofs offers a system-based solution that covers the entire roof surface rather than addressing individual problem areas one by one. Including panel joints and connection details, the entire roof is coated to provide a highly resistant barrier against water infiltration.

Why Are Sandwich Panel Roofs Vulnerable?

  • Water penetration through fastener holes over time
  • Opening of panel joints and seal deterioration
  • Expansion and contraction caused by UV exposure and temperature fluctuations
  • Micro-movements generated by wind loads
  • Water accumulation around gutters and parapet details

These issues are often addressed with localized repairs. However, every repair has the potential to create a new weak point. For this reason, a comprehensive coating system provides a more sustainable solution.

Advantages of the Polyurea System

Polyurea is a fast-curing, highly elastic coating system that can be applied directly onto sandwich panel surfaces.

1. Superior Waterproofing at Joints
Panel seams and fastener heads are reinforced with specialized detailing solutions. The entire surface is then coated, eliminating potential pathways for water intrusion.
2. Fast Installation Process
Large roof areas can be completed within a short timeframe, minimizing costs associated with operational downtime.
3. High Elasticity
Metal panels move as temperatures change. Polyurea accommodates this movement, reducing the risk of cracking.
4. Mechanical Durability
Resistant to impact, abrasion, and surface stresses. Particularly advantageous on roofs exposed to maintenance traffic.
5. UV Resistance
Provides long-term resistance against sunlight, rain, and temperature fluctuations when the correct system is selected.
6. Seamless Coating
Creates a continuous waterproofing layer without overlaps, exposed seams, or open joints, reducing detail complexity and improving system reliability.

Application Process

1. Inspection and Assessment
Roof slope, panel type, existing damage, and critical detailing areas are evaluated. A written technical report is provided as part of the consulting process.
2. Surface Preparation
Loose fasteners are tightened, damaged panels are inspected, and the surface is thoroughly cleaned.
3. Detail Reinforcement
Fastener heads, panel joints, and other critical areas are reinforced before coating.
4. Polyurea Application
The coating is spray-applied to achieve a uniform thickness across the entire surface.
5. Final Inspection and Handover
Coating thickness and overall surface continuity are inspected and verified.

Technical Properties of the Polyurea System

Technical Parameter Typical Range Description
Tensile Strength 18 – 25 MPa High mechanical strength and resistance to tearing
Elongation at Break 400% – 1000% Accommodates substrate movement
Tear Resistance 70 – 100 kN/m Resistance to mechanical stresses
Shore A Hardness 85 – 95 Combines elasticity and durability
Water Vapor Permeability < 1 g/m²·day Excellent waterproofing performance
Curing Time 5 – 15 seconds gel time Rapid reaction and short installation time
Service Temperature -30°C / +120°C Wide operating temperature range
Application Thickness 2 – 3 mm (roofing systems) May vary depending on project requirements

Elongation values approaching 1000% may be achieved with certain specialized formulations. However, for industrial roofing and flooring applications, a realistic and sustainable range is typically between 400% and 800%. Higher values do not always mean better performance; mechanical balance remains critical.

Suitable Applications

  • Factory roofs
  • Manufacturing facilities
  • Logistics warehouses
  • Aircraft hangars
  • Industrial complexes

In active production facilities, roof leaks affect not only building components but also machinery, raw materials, and manufacturing processes.

Warranty Period and Coverage

Our Polyurea systems are provided with a written 5-year warranty when proper surface preparation and specified coating thicknesses are achieved. This warranty covers not only the material but also the integrity of the application system.

  • Waterproofing performance
  • System integrity based on specified coating thickness
  • Adhesion performance
  • Water-tightness at critical details such as joints, connections, and penetrations

How Does the Warranty Process Work?

  1. A surface assessment is conducted before application.
  2. A technical inspection report is prepared as part of the consulting process.
  3. Coating thickness and surface integrity are verified after application.
  4. A warranty certificate is issued.

In industrial facilities, the primary risk is not water itself—it is the cost of operational downtime. For this reason, waterproofing should be planned not as a temporary repair, but as part of a long-term building protection strategy.

Consider waterproofing not as an expense, but as an investment in long-term operational security.

Sandwich Panel Roof Waterproofing with Polyurea 1Contact us directly by phone0212 284 4045

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