Corrugated insulated roof panels are metal-skinned sandwich panels whose outer face is roll-formed into trapezoidal ribs. The ribbed profile sheds rainwater quickly along defined channels and adds bending stiffness to the steel skin, so the panel both weathertightens and insulates a roof in a single prefabricated element installed directly onto purlins.
A polyurethane (PU) foam core is the standard insulation, delivering low thermal conductivity at a compact thickness. Where project budgets are tight and thermal demand is moderate, an expanded polystyrene (EPS) core offers a lighter, more economical alternative. Both cores are bonded continuously to pre-painted galvanized (PPGI) or galvalume (PPGL) steel faces of 0.3-0.6mm.
Panels are joined by overlapping the corrugated profiles and fastening with self-tapping screws fitted with EPDM washers, a simple exposed-fixing method that suits fast-track industrial and agricultural construction. Typical applications include steel-structure factories, logistics warehouses, agricultural barns, sports halls, and commercial complexes.
Your Trusted Manufacturer for Corrugated Insulated Panel
RaxPanel manufactures corrugated insulated roof panels in Hebei, China. The trapezoidal rib profile is roll-formed into the pre-painted steel coil on a dedicated profiling line before the sheet is bonded to the foam core, so rib height and side-lap geometry stay consistent from the first panel to the last. Consistent lap geometry is what keeps exposed-fixing roofs draining cleanly and fastener washers sealing over the long term.
Our corrugated line is one of several profiles running within a combined daily output of 1,700 m², shipping to over 30 countries across since 2002 of continuous operation. Every batch passes verified lamination and bonding checks — core density and skin adhesion are confirmed before panels are cut to order and packed for container shipment.
- PPGI/PPGL corrugated outer skin at 0.3-0.6mm with trapezoidal rib profile.
- PU foam core at 40-45 kg/m³ with thermal conductivity of 0.022-0.025 W/(m·K); EPS core optional.
- Standard thicknesses of 50mm, 75mm, 100mm, and 150mm with 950-1000mm effective width.
- Exposed-fixing overlap joint with EPDM-washer screws; minimum roof pitch of 5°.
| Parameter | Value |
|---|---|
| Skin Material | PPGI / PPGL / Galvanized Steel |
| Skin Thickness | 0.3-0.6 mm |
| Core Material | PU foam / EPS |
| Core Density | PU: 40-45 kg/m³; EPS: 12-30 kg/m³ |
| Теплопроводность | PU: 0.022-0.025 W/(m·K); EPS: 0.035-0.041 W/(m·K) |
| Thickness Range | 50-150 mm (standard: 50, 75, 100, 150 mm) |
| Effective Width | 950-1000 mm |
| Max Length | Up to 11,800 mm |
| Profile Type | Trapezoidal corrugated rib |
| Joint System | Overlap with self-tapping screws + EPDM washers |
| Min Roof Pitch | ≥ 5° |
| Fire Resistance | B1/B2 (PU); B2 (EPS) per EN 13501-1 / EN 13501-1 |
| Temperature Range | -50°C to +150°C |
| Coating | PE / SMP / HDP / PVDF |
Corrugated Insulated Panel Buying Guide
Corrugated insulated panels are an exposed-fixing roof and wall system where profile geometry, fastener discipline, and core selection jointly determine long-term weathertightness and thermal performance. This guide walks through the key specification decisions.
Pro Tip: Match Fastener Torque to Washer Compression
Over-driven screws cut EPDM washers and create leak paths within one season. Use a torque-controlled driver set to compress the washer by 1 mm, and re-check fasteners after the first thermal cycle.
Over-driven screws cut EPDM washers and create leak paths within one season. Use a torque-controlled driver set to compress the washer by 1 mm, and re-check fasteners after the first thermal cycle.
1. How rib profile geometry affects performance
Trapezoidal ribs serve two functions: they channel rainwater toward the eaves to prevent standing water on the flat pan, and they increase the section modulus of the thin steel skin so the panel spans wider purlin spacing. Rib height typically ranges from 25 mm to 40 mm. Deeper ribs increase spanning capacity but reduce the effective coverage width per panel, so the profile choice balances structural demand against material economy.
2. Selecting core type and thickness
3. Fastener systems and weathertightness
Exposed-fixing panels are fastened through the rib crown at every purlin with self-tapping screws carrying bonded EPDM washers. Side laps receive additional fasteners at 300-500 mm spacing. The correct installation torque compresses the washer by roughly 1 mm without over-driving. Stitch screws at end laps and ridge flashings complete the seal. All fasteners should be stainless steel or class-3 coated for coastal or industrial atmospheres.
4. Purlin spacing and span capacity
Allowable purlin spacing depends on panel thickness, skin gauge, and the governing wind or snow load. As a starting point, 50 mm panels with 0.5 mm skins span 1.5-2.0 m under moderate loads, while 100 mm panels or heavier-gauge skins extend the span. The final spacing should be confirmed by a deflection check limited to L/200 to preserve the roof’s drainage gradient.
5. When to choose corrugated over standing seam
Corrugated panels with exposed fasteners are the economical choice for industrial and agricultural buildings where erection speed and budget drive the decision. Standing seam systems conceal their fixings and suit architectural roofs, very low slopes below 5°, or projects where long-term fastener durability and a clean sight line are priorities.
Часто задаваемые вопросы
What is the minimum roof pitch for corrugated insulated panels?
A minimum pitch of 5° is recommended with sealed side laps. Below 5°, water drainage slows and the risk of capillary draw at laps increases, requiring structural sealant and closer fastener spacing.
How do I prevent condensation on the panel underside?
Specify a factory-applied anti-condensation fleece on the underside skin, and ensure the building has adequate ridge and eave ventilation to keep the roof cavity humidity below the dew point.
Can corrugated panels be used for walls as well as roofs?
Yes. The same panel profile serves both applications. Wall installations typically use thinner cores (30-50 mm) and can be mounted vertically or horizontally depending on the architectural intent.
What maintenance do exposed fasteners require?
Inspect fastener washers at 5-year intervals and replace any that show cracking or compression set. Re-torque loose screws and touch up scratched coatings to prevent corrosion at the fastener heads.
Sandwich Panel Manufacturer
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