When to use this system
The insPIRe® U panel with hidden fix is the choice when façade aesthetics matter to the design:
- Office units built into halls — office on the front + production hall at the rear. The front aesthetically articulated, the hall with cheaper S panel.
- Car showrooms and exhibition spaces — where the façade sells, a smooth surface with no visible fastener heads.
- New-generation big-box retail — where the façade has to look “lifestyle”, not “warehouse”.
- Public utility buildings — libraries, offices, schools, where “architectural” façades are specified.
Hidden fix mechanism
In contrast to insPIRe® S (visible joint):
| Aspect | insPIRe® U (hidden) | insPIRe® S (visible) |
|---|---|---|
| Screwed fastener | through the concealed joint lap, NOT visible from the façade side | through the protruding part of the joint, visible heads |
| Linear façade pattern | cleaner (no interruptions) | broken by fastener heads every 1000/1140 mm |
| Price per m² | +15–20% vs S | base |
| Modular width | exclusively 1000 mm | 1000 or 1140 mm |
| Thicknesses | 60–140 mm | 40–120 mm |
| Installation speed | slower (precise joint seating) | faster |
Variants
- insPIRe® U — core λ 0.022 W/(m·K), standard.
- insPIRe® U MAX — λ reduced to 0.019 (PIR-MAX). U = 0.14 W/m²·K at 140 mm.
Installation requirements
- Modular width 1000 mm — no 1140 mm variant for U (geometric limitation of the joint).
- Lengths 2.0–16.0 m (max limited by transport).
- Hidden fasteners — typically length = panel thickness + 50 mm anchorage in the steel structure.
- Installation sequence: lower joint precisely engaged into the upper joint of the previous panel → seating → screwing the fastener through the concealed lap.
Required flashings
The cladding system uses a set of flashings matched to the smooth façade:
- OB-01 / OB-02 — external / internal corner (preferred variants concealing fasteners: OB-03/OB-04)
- OB-17 — covering the longitudinal panel joint
- OB-36 — panel closure
- OB-37 — window sill
Technical documentation
Gór-Stal 2025 Technical Catalogue and Refrigeration Catalogue (p. 5). NRO + B-s1,d0 classification, PZH hygiene certificate, CE acc. to EN 14509:2013.
Layer composition
| # | Layer | Thickness | λ | Role |
|---|---|---|---|---|
| 1 | External facing — S220-S280GD steel sheet + 25 µm coating (L/M/F/R/P profiling) | 0.5–0.7 mm | — | external facing |
| 2 | PIR / PIR-MAX core (density 40 kg/m³) | 60–140 mm | 0,022 W/(m·K) | main insulation |
| 3 | Internal facing — steel sheet + 25 µm coating (L/P profile) | 0.4–0.5 mm | — | internal facing |
U-value by insulation thickness
| termPIR® thickness | U [W/m²·K] | Meets WT 2021 (roof U ≤ 0.15) |
|---|---|---|
| 60 mm | 0,38 | — no |
| 80 mm | 0,27 | — no |
| 100 mm | 0,22 | — no |
| 120 mm | 0,19 | — no |
| 140 mm | 0,17 | — no |
Related catalogue items
Applications
Installation accessories
