Product Overview
Polyurethane (PU) Sandwich Roof Panel is a high-performance thermal insulation roofing system designed for industrial, commercial, and cold storage buildings.
It is composed of two durable metal facings bonded with a rigid polyurethane foam core, forming a lightweight, energy-saving, and structurally stable roofing solution.
Compared with traditional roofing materials, PU sandwich roof panels significantly improve energy efficiency, reduce operational costs, and shorten project installation time.
Technical Specifications
|
Item |
Specification |
|
Panel Type |
PU Sandwich Roof Panel |
|
Core Material |
PU / PIR |
|
Steel Thickness |
0.3–0.8 mm |
|
Panel Thickness |
40 / 50 / 75 / 100 / 120 / 150 / 200 mm |
|
Effective Width |
1000 mm |
|
Length |
1–12 m (customized) |
|
Density |
38–45 kg/m³ |
|
Thermal Conductivity |
0.022–0.028 W/m·K |
|
Compressive Strength |
≥150 kPa |
|
Water Absorption |
≤2% |
|
Wind Resistance |
Suitable for high wind-load regions |
|
Fire Rating |
B2 / B1 / EN 13501-1 optional |
|
Service Temperature |
-50°C to +80°C |
Key Performance Advantages
Elite Thermal Efficiency
The high-density rigid foam structure acts as an absolute thermal barrier. It prevents thermal bridging, ensuring indoor temperature stability and massive lifecycle energy cost savings.
High Load-Bearing Capacity for Large Spans
The composite structural binding gives the panels incredible flexural strength. This allows for wider purlin spacing in steel structures, reducing the total amount of structural steel required for the roof grid.
Advanced Leak-Proof Joint Design
Our roofing profiles utilize an advanced overlap and hidden-screw interlocking system featuring deep capillary drainage grooves. It completely blocks heavy rain penetration and withstands extreme typhoon/hurricane wind pressures.
Long-Term Lifecycle Economy
Engineered with premium anti-corrosion steel coatings and a stable core that will not degrade or sag over time. Designed for a maintenance-free service life of 25-30 years.
Widely Used in High-Demand Application Scenarios
Industrial Infrastructure
Large-span steel structure factories, manufacturing workshops, and heavy industry plants.
Logistics & Cold Chain
Modern distribution centers, logistics hubs, and ultra-low temperature cold storage facilities.
Commercial Complexes
Large supermarkets, exhibition halls, shopping malls, and sports arenas.
Prefabricated Construction
Modular buildings, temporary site offices, and container housing systems.
Engineering-Grade Product Structure
External Steel Sheet
Material Base: Premium PPGI (Pre-painted Galvanized Steel) / PPGL (Pre-painted Galvalume Steel)
Thickness Range: 0.3 mm - 0.7 mm (Accurate to ISO standard tolerances)
High-Performance Coatings: PE (Polyester) | SMP (Silicon Modified Polyester) | HDP (High Durability Polyester) | PVDF (Polyvinylidene Fluoride) for maximum UV and chemical resistance.
Engineering Functions: Wind load distribution, UV shielding, coastal corrosion resistance, and long-term aesthetic durability.
PU / PIR Insulation Core
Material: Rigid Polyurethane (PU) / Polyisocyanurate (PIR) foam via continuous high-pressure injection.
Density: 38 - 45 kg/m3 (Optimized for structural strength and thermal performance)
Thermal Conductivity: Less than or equal to 0.022 W/(m.K) (Tested at 10 deg C core temperature)
Closed-Cell Structure: Over 90% (Prevents water absorption and maintains lifetime insulation value)
Engineering Functions: Eliminates HVAC energy losses, provides a continuous vapor barrier, and offers FM-approvable fire resistance options (PIR core).
Internal Steel Liner
Material: Lightly profiled color-coated steel / aluminum-coated steel foil.
Engineering Functions: Increases composite panel stiffness, prevents indoor condensation, and provides a clean, chemical-resistant, wash-down interior ceiling surface.
Global Project Experience
Wanxiang roof systems are engineered and proven to perform under extreme global environmental stresses:
High-Temperature & UV Environments
25,000 sq.m. Industrial Warehouse Facility - Riyadh, Saudi Arabia (Withstanding over 50 deg C ambient desert conditions).
High-Humidity & Coastal Environments
45,000 sq.m. Cold Chain Logistics Hub - Jakarta, Indonesia (C4/C5 anti-corrosion coating specification with high vapor barrier performance).
Heavy Rainfall & Typhoon Zones
30,000 sq.m. Steel Structure Manufacturing Plant - Manila, Philippines (Engineered for high wind-uplift resistance).
Stringent QA Testing Program
Every batch undergoes rigorous engineering validation prior to dispatch:
Core Density Uniformity Test
Ensuring consistent 38 - 45 kg/m3 distribution.
Tensile Bonding/Adhesion Strength Test
Ensuring zero face-to-core delamination under thermal stress.
Thermal Conductivity Validation
Tested via heat flow meter apparatus.
Laser Dimensional Tolerance Inspection
Guaranteeing perfect interlocking fit on site.
Full OEM/ODM Customization Options
We offer comprehensive tailored engineering support for distributors and project contractors:
Dimensional Profiles
Custom thickness (40 mm to 200 mm), custom lengths, and multiple surface profiles (ribbed, flat, micro-wave).
Aesthetic Finishes
Full range of RAL Classic Colors with premium weather-resistant coatings (PE, PVDF, HDP).
Structural Customization
Flexible choice of steel substrates (GI/GL/Aluminum) and target fire safety ratings (B2, B1, PIR).
Packaging, Loading & Logistics
To eliminate transit damage during long-distance ocean freight, we implement a strict export-standard packaging protocol:
Surface Protection: Every panel is applied with a PE protective film to prevent steel coating scratches.
Secure Bundling: Heavy-duty structural bundling with high-tensile steel straps and protective edge corners.
Container Optimization: Smart loading layouts maximizing the volumetric capacity of 20GP/40HQ containers to minimize freight costs per square meter.
Standard Lead Time: 10-20 working days from order confirmation to port delivery.
Why Partner with Wanxiang?
20+ Years of Manufacturing Excellence in building envelope and steel structure systems.
Advanced Continuous Production Lines guaranteeing high volume output, rapid lead times, and structural uniformity.
Robust EPC Supply Chain Capacity to handle multi-thousand square meter fast-track delivery projects.
ISO 9001:2015 & ISO 14001:2015 Certified Factory Quality Management.
Certificates
Frequently Asked Questions
Q: What is the difference between PU and PIR sandwich roof panels?
A: PU panels provide excellent thermal insulation, while PIR panels are an upgraded version with improved fire resistance and lower smoke emission, making them more suitable for stricter building safety requirements.
Q: What roof pitch is required for PU sandwich roof panels?
A: Generally, a minimum roof slope of 5%–10% is recommended to ensure proper rainwater drainage and prevent water accumulation, depending on project design and climate conditions.
Q: What is the maximum span length for PU sandwich roof panels?
A: Span capacity depends on panel thickness, steel thickness, and structural design. For most industrial applications, PU roof panels can support long-span steel structures when properly engineered.
Q: Can PU roof panels be used in cold storage buildings?
A: Yes. PU sandwich panels are widely used in cold storage and freezer warehouses due to their extremely low thermal conductivity and excellent airtight performance.
Q: Are PU sandwich roof panels suitable for high wind or coastal areas?
A: Yes. With proper steel thickness and fixing system design, PU roof panels perform well in high wind pressure and coastal environments with anti-corrosion coatings.
Q: What is the typical service life of PU sandwich roof panels?
A: Under normal installation and maintenance conditions, PU roof panels can last 20–30 years, depending on coating type and environmental conditions.
Q: Can you customize panel thickness and color?
A: Yes. We provide full customization including thickness (40–150 mm), steel coating colors (RAL system), and surface profiles according to project requirements.
Q: Do you provide installation guidance or technical support?
A: Yes. Wanxiang provides installation recommendations, technical datasheets, and engineering support for EPC contractors and construction teams to ensure proper installation.
Inquiry System
Looking for a reliable roofing insulation solution for your project?
Wanxiang provides engineering-grade PU sandwich roof panels for EPC contractors and industrial construction projects worldwide.
To get accurate quotation, please provide:
Project drawings (if available)
Required thickness
Climate conditions
Application type
Our engineering team will respond within 24 hours with technical + commercial proposal.
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