Insulated metal roofing (sandwich panels)
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What it is
An insulated metal roofing panel is a sandwich panel formed by three layers: an upper face of pre-painted or galvanized steel, a rigid polyurethane foam core, and a lower steel face. The upper face is profiled to define the panel's geometry — trapezoidal, corrugated or standing seam. It is the foam core that transforms a simple metal sheet into an integrated solution combining thermal insulation, acoustic damping and structural stiffness.
The rigid PU foam core is produced in situ — liquid components are dispensed directly between the metal faces and react to form the foam, which chemically bonds to both faces during cure. This chemical adhesion is what gives the panel its structural behavior: it works as a sandwich beam, with the metal faces resisting tensile and compressive stress and the core transmitting shear stress.
Common thicknesses range from 25 to 100 mm, with typical density between 38 and 45 kg/m³. The choice of thickness and chemistry (PUR/PIR or PIR) is determined by end application: light industrial sheds at 25–40 mm, cold rooms at 50–75 mm, and ultra-cold installations at 75–100 mm.
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Value proposition
Thermal performance vs. roofing alternatives:
| Solution | Lambda (W/m·K) | R-value (m²·K/W) 50mm | Relative |
|---|---|---|---|
| PIR panel (50mm) | 0.022 | 2.27 | 100% |
| PUR/PIR panel (50mm) | 0.024 | 2.08 | 92% |
| Pure PUR panel (50mm) | 0.026 | 1.92 | 85% |
| EPS (50mm) | 0.038 | 1.32 | 58% |
| Glass wool (50mm) | 0.040 | 1.25 | 55% |
| Plain metal roofing | — | ~0.05 | <5% |
Proven data to support the sale:
- HVAC consumption reduction: 30–40% vs. conventional uninsulated roofing, in logistics sheds across the Brazilian climate range (conservative estimate based on R-value differential)
- Noise reduction: 18–26 dB vs. plain metal roofing — noticeable differential in industrial sheds, offices and educational facilities
- Installation speed: 40–60% faster than conventional roofing with separate insulation, reducing project schedule
- Estimated service life: 25 to 40 years with appropriate maintenance of the steel faces
ROI argument for logistics sheds (industry benchmark): A 5,000 m² shed with PUR/PIR insulated metal roofing vs. plain roofing reduces HVAC consumption by USD 1,500–3,000 per month, depending on region and use profile. The additional cost of the insulated panel is recovered in 18 to 36 months — a consistent argument for customers focused on TCO (Total Cost of Ownership).
Regulatory and ESG argument: Brazilian municipalities are tying incentives (property tax reduction, accelerated project approval) to LEED and EDGE certification. Panels with PUR/PIR core contribute directly to the energy efficiency requirements of these certifications. For corporate clients with Scope 2 and 3 targets, the differential in operational energy consumption is traceable and accountable.
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Related applications
Sandwich panels for industrial walls and roofs
PUR/PIR system · PIR system
Closed-cell spray foam insulation
Closed-cell spray foam 2K system · Open-cell spray foam 2K system (water-blown)
Roof and slab waterproofing
1K liquid PU membrane · 2K liquid PU membrane
Structural construction adhesives
1K PU adhesive (moisture-cure) · 2K structural PU adhesive