Product Overview
EPS Sandwich Roof Panel is a prefabricated roofing material designed for steel structure buildings that require controlled construction cost, fast installation, and basic thermal insulation performance.
The panel combines two profiled steel sheets with an EPS (Expanded Polystyrene) foam core. It replaces traditional multi-layer roof systems by integrating structural covering and insulation into one product, reducing on-site installation complexity.
Wanxiang supplies EPS roof panels for industrial and commercial projects including warehouses, logistics facilities, workshops, agricultural buildings, and prefabricated structures.
Technical Specifications
|
Item |
Specification |
|
Panel Thickness |
50 / 75 / 100 / 150 / 200 mm |
|
Effective Width |
950 / 1000 / 1130 mm |
|
Length |
Custom cut according to project design |
|
Steel Thickness |
0.3 – 0.8 mm |
|
Core Material |
EPS foam (Expanded Polystyrene) |
|
Thermal Conductivity |
0.036–0.041 W/m·K |
|
Joint Type |
Overlap / concealed screw / tongue & groove |
|
Color System |
RAL standard color options |
Engineering Performance
Lightweight Roof System for Steel Structures
EPS panels reduce overall roof dead load compared with rock wool or concrete-based systems. This can help reduce steel consumption in purlin and secondary framing design, especially in large-span buildings.
Basic Thermal Insulation for Industrial Buildings
The EPS core slows heat transfer through the roof structure, helping reduce temperature fluctuation inside warehouses, workshops, and agricultural buildings. It is commonly used in projects where moderate insulation performance is acceptable.
Faster On-Site Installation
The panels are factory-made and delivered ready for installation. On-site work mainly includes positioning, fastening to steel purlins, and sealing joints. This reduces construction steps compared with multi-layer roofing systems.
Stable Factory Production Quality
All panels are produced under continuous lamination conditions to ensure consistent bonding quality between steel sheets and EPS core. This helps reduce quality variation that may occur in manual assembly systems.
Cost Efficiency in Large Projects
EPS roof panels combine roofing and insulation into a single material system. This reduces the need for additional insulation layers and simplifies procurement, installation, and logistics for large-scale steel structure projects.
Application Scenarios
EPS Sandwich Roof Panels are commonly used in projects where cost efficiency and fast construction are more important than high fire-rating roofing systems.
Industrial & Manufacturing
Steel structure workshops
Light manufacturing plants
Assembly and production facilitiesc
01
Logistics Infrastructure
Distribution warehouses
Storage centers
Logistics hubs
02
Agricultural Buildings
Grain storage warehouses
Farm equipment shelters
Agricultural processing buildings
03
Temporary & Modular Buildings
Construction site offices
Temporary housing structures
Modular project buildings
04
Light Commercial Structures
Exhibition support buildings
Sports facility auxiliary roofing
Budget-driven commercial halls
05
Material Structure
Outer Steel Layer
Pre-painted galvanized steel (PPGI) or galvanized steel (GI)
Zinc coating range: Z80–Z275 depending on environmental requirements
Surface options: Smooth / embossed / anti-condensation coating
Function: Weather protection and structural durability
EPS Core Layer
Density range: 8–20 kg/m³ (adjustable by project requirement)
Closed-cell structure helps reduce air movement inside the panel
Provides basic thermal insulation for roof systems
Bonding System
Continuous industrial lamination process
High-pressure adhesive bonding ensures full surface adhesion
Reduces risk of delamination during transport and installation
EPS Roof Panel Compared with Alternative Systems
|
Performance |
EPS Panel |
Rock Wool Panel |
PU Panel |
|
Cost level |
Low |
Medium–High |
High |
|
Thermal insulation |
Medium |
High |
High |
|
Fire resistance |
Basic |
High |
High |
|
Weight |
Light |
Heavy |
Light |
|
Installation speed |
Fast |
Medium |
Fast |
|
Typical usage |
Budget industrial roofs |
Fire-sensitive buildings |
High-performance insulated buildings |
Quality Control System
Wanxiang applies multi-stage quality control throughout production:
Incoming Material Control (IQC)
- Steel coil inspection
- EPS material density verification
In-Process Control (IPQC)
- Lamination pressure monitoring
- Panel thickness measurement
- Bonding consistency check
Final Inspection (FQC)
- Dimensional accuracy
- Surface quality
- Edge alignment
- Visual defect inspection
Customization Options
Wanxiang provides production customization within engineering and transportation limits to ensure panels match different steel structure designs and project conditions.
Panel Dimensions
EPS roof panels can be produced according to project drawings:
|
Panel length |
Cut-to-size based on roof span and container loading limits |
|
Effective width options |
950 mm / 1000 mm / 1130 mm |
|
Thickness range |
50 mm to 200 mm |
Steel Surface Specification
Outer steel sheets can be adjusted based on environmental conditions:
|
Steel type |
Galvanized steel (GI) or pre-painted galvanized steel (PPGI) |
|
Zinc coating |
Z80–Z275 depending on corrosion level requirement |
|
Surface finish |
Smooth / embossed / anti-condensation coating |
Color Selection
Color can be customized based on architectural or project requirements:
- Standard RAL color system
- Common industrial colors (white, grey, blue, red, etc.)
- Color consistency control across full project batches
EPS Density Adjustment
EPS core density can be adjusted depending on insulation and structural requirements:
|
Standard range |
8–20 kg/m³ |
|
Lower density |
Cost-oriented projects |
|
Higher density |
Improved mechanical stability and insulation performance |
Joint & Connection Design (Project-Based)
Different roof installation systems can be supported depending on steel structure design:
- Overlap joint system
- Concealed screw system
- Tongue-and-groove edge design (for selected projects)
Packaging & Export Delivery
Wanxiang provides export-ready packaging designed for safe long-distance sea freight and efficient on-site handling.
Packaging Method
Steel strip bundling for stable loading
Optional protective film to avoid surface scratches
Edge protection available for long panels
Waterproof wrapping to reduce moisture impact during shipping
Container Loading
Standard loading for 20GP and 40HQ containers
Optimized stacking based on panel length
Fixed and secured inside container to prevent movement
Designed to maximize container utilization and reduce shipping cost
Export Delivery
Pre-shipment inspection before loading
Standard export documents provided (invoice, packing list, loading plan)
Container sealing for shipment traceability
Suitable for bulk orders and project-based delivery schedules
Project Supply Mode
For large projects, shipment can be arranged in batches to match installation progress and reduce on-site storage pressure.
Certificates
FAQ
Q: Can EPS roof panels be used in permanent buildings?
A: Yes. They are widely used in long-term industrial and commercial buildings where structural design and installation are properly executed.
Q: How does EPS perform in different weather conditions?
A: EPS panels can be used in both hot and cold climates. The performance depends mainly on steel coating selection and joint sealing quality.
Q: Are EPS roof panels waterproof?
A: The steel outer sheets provide weather resistance, and proper overlap design with sealing ensures effective roof waterproof performance.
Q: Can EPS roof panels be used in coastal or humid areas?
A: Yes, but anti-corrosion steel coating (such as higher zinc coating) and proper sealing systems are recommended.
Q: What installation system is used?
A: Panels are fixed to steel purlins using self-drilling screws with sealing washers, along with ridge caps and flashing accessories.
Q: Can panel length and thickness be customized?
A: Yes. Thickness and length can be customized according to project design, steel structure span, and transportation limits.
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