Lightweight garden pod and outbuilding panel
72mm SIP Panel Specification
The slimmest SIP UltraSIPs stocks — a solid, rack-resistant shell for non-habitable garden buildings where internal floor area matters more than U-value.
Panel build-up
Every UltraSIPs panel bonds a rigid PIR insulation core to two structural Sterling OSB/3 boards, creating a single composite panel that is both the insulation and the load path — no separate timber frame to insulate around, and far fewer thermal bridges than stud construction.
This 72mm panel uses a 50mm PIR core (thermal conductivity λ = 0.022 W/mK) faced with 11mm OSB (λ = 0.13 W/mK). The resulting U-value of 0.383 W/m²K is calculated to BS EN ISO 6946 — the same method behind our interactive U-value calculator, where you can model other core and OSB combinations.
Panels are manufactured up to a maximum board size of 2440mm × 1220mm.
Indicative Part L U-value check
Comparison of this panel's 0.383W/m²K U-value against common England & Wales Part L 2021 elemental U-value targets. For projects targeting those values, choose a thicker panel from the range below.
Fabric U-value comparison only. This is not whole-building compliance or Building Control approval. Junctions, openings, ventilation, fire linings and the wider specification should be confirmed with your designer, engineer or Building Control. Fire resistance is achieved with the appropriate internal lining (for example plasterboard) and should be specified per project.
Where the 72mm panel fits
Best for
- Garden pods, bin and bike stores, and tool rooms
- Non-habitable outbuildings and covered structures
- Projects where maximising internal floor area beats thermal performance
Consider a different panel when
Habitable rooms where a lower U-value is required under the project specification or Building Regulations route — step up to the 122mm or 172mm panel.