Why Weight Matters More Than You Think
An architect selecting relief panels for a hotel lobby is typically thinking about geometry, colour, and fire rating. The structural engineer is thinking about one thing: how much does it weigh? The panel weight per square metre determines the fixing system, the substrate specification, and in some cases whether the wall can support the design at all.
Relief panels are heavier than their flat equivalents — sometimes significantly so. A 25 mm flat PMAG panel weighs approximately 35–40 kg/m². But a deep-relief PMAG panel with peaks at 40 mm has substantially more material mass. The effective weight depends on the average thickness across the relief profile, not the nominal thickness.
Panel Weight by Material and Thickness
| Material | Nominal Thickness | Density | Weight per m² | Context |
|---|---|---|---|---|
| Lumina PMAG™ | 15 mm (low relief) | 1,400–1,600 kg/m³ | ~21–24 kg/m² | Shallow texture, ceiling-safe |
| Lumina PMAG™ | 25 mm (standard) | 1,400–1,600 kg/m³ | ~35–40 kg/m² | Standard wall installations |
| Lumina PMAG™ | 40 mm (deep relief) | 1,400–1,600 kg/m³ | ~56–64 kg/m² | Feature walls, structural substrate required |
| Lumina PUCOMP™ | 8 mm (thin shell) | 800–1,200 kg/m³ | ~6–10 kg/m² | Furniture, fixtures, lightweight features |
| Lumina PUCOMP™ | 15 mm (standard) | 800–1,200 kg/m³ | ~12–18 kg/m² | General wall cladding, complex geometry |
| Lumina PUCOMP™ | 25 mm (deep relief) | 800–1,200 kg/m³ | ~20–30 kg/m² | Deep-profile feature walls |
For relief panels, the nominal thickness is the maximum depth — but the average material thickness is typically 60–70% of that for moderate relief profiles. Ask the manufacturer for the average section weight based on the specific design geometry, not the maximum thickness. This is the number your structural engineer needs.
How Relief Panels Compare to Other Cladding
To put these numbers in context, here's how Lumina panels compare to common alternatives at typical installation thicknesses.
The key takeaway: PUCOMP at standard thickness is lighter than timber, which makes it viable on virtually any substrate including standard plasterboard partitions. PMAG at standard thickness is comparable to GRC — a material that architects already specify routinely for interior installations.
Substrate Load Capacities
Not all walls are created equal. The substrate's capacity to carry sustained dead load determines which material you can specify — and which fixing system you need.
⚠ PMAG — requires rail system bypassing board
⚠ PMAG 15mm only — heavier needs rail
✓ PUCOMP all thicknesses
✓ PUCOMP all thicknesses
The Engineer's Handoff Checklist
When passing relief panel information to your structural engineer or M&E consultant, they need the following data points to verify the design is structurally sound. Most manufacturers can provide these on request — and should be able to do so before you commit to a specification.
Beyond these three numbers, the engineer will want to see: the fixing detail drawing (showing the interface between panel, bracket, and substrate), the substrate specification (stud gauge, board type, board layers), and confirmation that the fixing system accounts for both dead load (panel self-weight) and any imposed loads (accidental impact, vibration in transit areas, seismic if applicable).
Request the manufacturer's fixing detail drawing early — ideally at RIBA Stage 3 / schematic design, before the partition specification is locked. The partition contractor needs to know about panel loads before they finalise their stud gauge and board specification. Discovering at fit-out stage that the partitions can't carry the panels is the most expensive version of this mistake.