What is a sandwich panel?
A sandwich panel is a product used for cladding building walls and roofs. It consists of an insulated core material sandwiched between two metal sheets. A sandwich panel is not a structural material, but rather a cladding material. While the structural forces are carried by a steel frame or other supporting framework, the sandwich panel is attached to it.
Types of sandwich panel
☆Classification by Application
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Wall panels |
Sandwich panels are used for vertical building envelopes, requiring aesthetic appeal and fire resistance.
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Roof panels |
Sandwich panels are engineered for horizontal installation, prioritizing waterproofing and load-bearing capacity.
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☆Classification by Core Material
Sandwich panels' performance is primarily determined by their core material, categorized into four key types:
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Polyurethane (PU)/Polyisocyanurate (PIR) core sandwich panels |
Featuring ultra-low thermal conductivity (as low as 0.022 W/m·K) and high structural strength, They are extensively used in temperature-controlled environments (e.g., cold storage, cold chain logistics centers).
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Rock wool core sandwich panels |
With Class A non-combustibility, these panels provide optimal fire resistance for high-safety facilities (e.g., hospitals, chemical plants). But they exhibit strong hygroscopicity, requiring strict seam sealing during installation.
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Expanded polystyrene (EPS) core sandwich panels
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With ≈60% lower cost than rock wool panels and lightweight properties (10–14 kg/m²), But they are flammable and emit toxic fumes, restricting their use to temporary structures or non-fire compartment areas.
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Glass wool core sandwich panels |
As a balanced option, they surpass rock wool in thermal insulation and outperform EPS in fire resistance. Hydrophobic types must be selected to ensure moisture resistance (water absorption ≤2%) |
Why choose sandwich panels rather than traditional masonry?
Sandwich panels are preferred for cost efficiency, with key advantages over traditional masonry in three areas:
☆Direct costs
Construction expenses (materials, labor, and shipping) are comparable between stud partition (frame-based) and masonry methods.
☆Construction time
Stud partition buildings assemble in 1 month versus 6–7 months for masonry, enabling faster commissioning and return on investment. Components arrive prefabricated for dry assembly, eliminating moisture-waiting delays.
☆Construction processes
Stud partitioning uses a "dry process"—only screw-based assembly without water—unlike masonry's "wet processes" (e.g., mortar/concrete mixing). This suits humidity-sensitive industries like pharmaceuticals or wood processing.
Price of sandwich panels
Purchase cost depends on panel thickness and insulating core material, with EPS-core panels offering a budget option; however, panels featuring lower thermal conductivity coefficients, such as PIR-core, provide greater long-term cost efficiency and performance.
For more details, please contact Yumisteel.
Installation of sandwich panels
Sandwich panel installation is efficient—a skilled crew can install 600m² in ~8 hours.
Key steps include:
☆Material Delivery & Handling
Panels, subframes (cold-formed beams/purlins), and accessories (flashing, fasteners, seals) arrive on-site and are unloaded using equipment.
☆Subframe Assembly
Structural frames (beams, posts, purlins) are erected to support panels.
☆Panel Installation
Remove protective film from panels.
Secure panels to subframes using specialized fasteners (≈1.1 screws/m²; exact spacing/layout determined by engineers).
☆Sealing & Finishing
Seal joints between panels and install flashing for weatherproofing.
Production process of sandwich panels
Sandwich panels revolutionize construction by offering speed, efficiency, and sustainability, making them ideal for modern, eco-friendly buildings.
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