Polystyrene Foam Sandwich Roof Panel

Product Details

Polystyrene foam sandwich roof panel is lightweight roofing cladding materials made with expandable polystyrene (EPS) foam as the core material, covered with color-coated steel sheets or galvanized steel sheets on both sides, and bonded together under heat and pressure in a continuous molding machine using a high-strength adhesive. Their classic “sandwich” composite structure combines load-bearing, thermal insulation, waterproofing, and decorative functions, making them widely applicable to roofing systems for large-span industrial plants, steel structure warehouses, logistics centers, and other buildings.

Product Structure

Polystyrene foam sandwich roof panel is typically composed of a three-layer composite structure:

1. The top and bottom panels are made of color-coated steel sheets, galvanized steel sheets, or stainless steel sheets, with a thickness generally ranging from 0.3 to 0.6 mm, serving waterproofing, durability, and decorative purposes.

2. The core material is closed-cell polystyrene (EPS) foam with a density ranging from 10 to 25 kg/m³. It is made from expandable polystyrene beads through multiple processes including pre-foaming, curing, molding, drying, and cutting, and features lightweight, thermal insulation, and low water absorption.

3. The panel and core material are bonded together under high temperature and pressure using a two-component polyurethane adhesive to form a stable integral structure.

Product Parameters

Common specifications and technical parameters of polystyrene foam roofing sandwich panels are as follows:

Parameter	Typical Range / Value
Panel Thickness	50mm – 200mm (common: 50, 75, 100, 120, 150, 200mm)
Effective Width	950mm, 1000mm, 1150mm, etc.
Panel Length	≤ 12.5m (customizable per project)
Steel Sheet Thickness	0.2 – 0.8mm (color coated steel sheet / galvanized sheet)
Core Density	18 – 22 kg/m³ (standard compliant)
Thermal Conductivity (λ)	0.038 – 0.043 W/(m·K)
Thermal Transmittance (Uc)	0.42 W/(m²·K) (for 80mm thickness) ~ 0.14 W/(m²·K) (for 250mm thickness)
Fire Performance Class	Class B2 (combustible) or flame-retardant treated up to Class B1 (difficult to ignite)
Peel Performance	Bonded area ≥ 85% of total interface
Adhesive Strength	≥ 0.10 MPa (in compliance with GB/T 23932-2025)
Minimum Roof Slope	≥ 4% (approx. 2.3°)
Service Temperature Range	-40°C to +90°C
Self Weight	approx. 8 – 13 kg/m² (including steel sheets and core)

Product Advantages

Polystyrene foam roof sandwich panels have become the mainstream material for lightweight steel structure roofs due to the following core advantages:

• Ultra-lightweight: The weight of the panels is approximately 1/20 to 1/30 of that of a concrete roof, significantly reducing the load on the main steel structure and foundation costs.
• Thermal Insulation: The thermal conductivity of the EPS core material is 0.038–0.043 W/(m·K). Its excellent closed-cell structure effectively blocks heat transfer, resulting in significant energy savings.
• Multifunctional: The panels integrate load-bearing, insulation, waterproofing, and decoration, eliminating the need for secondary finishing and simplifying roof structure.
• Fast Construction: Modular design allows for dry on-site installation, eliminating wet work and reducing the construction period by over 40% compared to traditional cast-in-place roofs.
• Economical and Durable: Significantly cost-effective materials; the galvanized steel panels undergo anti-corrosion treatment, ensuring an overall service life of 15-20 years or more.

Main Applications

Polystyrene foam sandwich roof panel due to their lightweight, high strength, and excellent thermal insulation properties, are widely used in various building roofing systems:

Industrial Buildings: Roofing panels for steel structure factories, processing workshops, logistics warehouses, car dealerships, and large exhibition halls.

Public Facilities: Roofing systems for large-span buildings such as stadiums, conference centers, theaters, and waiting rooms.

Temporary and Modular Buildings: Roofing cladding for prefabricated houses, modular houses, and container houses.

Cleanrooms and Special Purpose Buildings: Thermal insulation factories, cleanrooms, cold storage facilities, and other places with high requirements for thermal insulation performance.

Existing Roof Renovation: Covering existing purlins; suitable for the renovation and upgrading of old trapezoidal roofs.

Selection and Safety Tips

When selecting and applying polystyrene foam sandwich roof panel, the following points should be noted:

Firstly, the combustion performance of polystyrene core material is usually B2 (combustible). It will burn rapidly and release a large amount of toxic smoke when exposed to an open flame, and should not be used in roofing systems of densely populated places (such as hospitals, schools, and shopping malls) or high-rise buildings. If Class A fire protection requirements are involved (such as in chemical workshops and clean areas for food processing), rock wool sandwich panels or composite panels with non-combustible core materials should be prioritized according to local fire safety regulations.

Secondly, in accordance with the national standard GB/T 23932-2025, qualified products with a core material density ≥18kg/m³ and a metal panel thickness ≥0.5mm should be selected to ensure the thermal insulation performance, structural strength, and safety of the panels.

Thirdly, a slope of ≥4% should be maintained during roof installation, and the joints between panels should be properly sealed to prevent core material aging and panel corrosion due to water accumulation or moisture intrusion. Especially in high-humidity climates, the quality of installation details directly affects the service life of the roof.

In conclusion, polystyrene foam sandwich roof panel, with their mature cost-effectiveness and lightweight, efficient installation characteristics, are an ideal choice for roofing systems in conventional industrial plants and storage facilities, and will continue to occupy an important market position in high-cost-performance projects.

We earn the long-term trust of global clients through unparalleled efficiency and relentless pursuit of quality excellence.

Production Workshop Display

The company has a modern production base of over 8,000 square meters, equipped with a steel structure welding workshop, two Italian‑imported sandwich panel production lines, three complete house production lines and an intelligent assembly system. The annual steel structure capacity reaches 150,000 tons, with a daily output of 3,000 square meters of high‑end sandwich panels and 200 sets of modular houses.

Product Packaging & Shipping

Our packing and shipping services offer customized, robust transportation solutions for every product category, ensuring your goods arrive safely worldwide. Steel structural components are packed with sturdy steel frames, forming stable transport units that effectively withstand the bumps and pressure of long-distance sea and land transport. Sandwich panels and container houses are fully wrapped with high-quality protective films, providing moisture, dust, and scratch protection while fully preserving the coating and appearance of the panels. We have deep expertise in export logistics; from packing methods to container loading, every step is professionally optimized to provide you with a worry-free and reliable delivery experience.

Why Choose Us?

• Compliance guaranteed: Complete international certifications, compatible with national standards, reducing application and acceptance risks.
• Cost controllable: Chinese supply and prefabricated construction result in overall cost savings of 15%-25%.
• Schedule guaranteed: BIM collaboration and factory prefabrication enable rapid production and a competitive market advantage.
• Reliable quality: Export-grade processes and rigorous testing ensure both structural safety and durability meet standards.

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