Product · Building Envelope
Product · InnDex 62 · Evidence provided · High specification risk
Ultra-thin vacuum-insulated panels for facade retrofit achieving 10× better thermal performance than conventional foam.
Vacuum insulated panels (VIPs) consist of fumed silica or fibre cores sealed under near-vacuum, delivering centre-of-panel thermal conductivity of ~0.007 W/mK. They address the retrofit constraint where external insulation thickness is prohibited (heritage conservation, urban infill, floor-area loss) by achieving U-values of 0.14–0.28 W/m²K in 10 cm systems, with documented whole-building energy reductions of 35–46% in Spanish and Swedish deployments.
Vacuum insulated panels achieve centre-of-panel thermal conductivity around 0.007 W/mK — roughly 10 times better than conventional foam — allowing a 10 cm assembly to deliver U-values of 0.14 to 0.28 W/m²K, and their documented 35 to 46 percent whole-building energy savings in Spanish and Swedish deployments give them a genuine evidential foundation at the RIBA Stage 2 level. The rationale is site-specific: VIPs exist to solve the problem where heritage designation, planning restrictions on external cladding depth, or internal floor-area loss make standard insulation thickness technically or commercially impractical. One provided data point at inndex 62 reflects what that evidence base is — limited to European temperate climate deployments rather than a broad cross-climate track record. The fragility constraint is not a minor qualification: VIPs are mechanically sensitive during transport, handling, and installation, and a punctured or pressure-compromised panel performs at foam levels, not vacuum levels — failure is invisible and irreversible. Long-term vacuum retention over the 25-plus year building lifecycle is not fully characterised, and edge thermal bridging at panel perimeters imposes a whole-panel performance penalty that must be accounted for in the thermal model. Specialist detailing and trained installers are non-negotiable and are not standard in most curtain-wall or cladding supply chains. The application window is genuinely narrow — constrained heritage and infill retrofits where the performance gap cannot be closed any other way — but within that window VIPs are the technically correct answer; budget for the premium, the handling specification, and the inspection protocol rather than treating them as a straightforward cladding upgrade.
The cited ScienceDirect paper (Peng et al., 2019, Energy & Buildings 188) reports real retrofits in Spain and Sweden with measured energy savings. Core thermal conductivity of 0.007 W/mK is laboratory-grade and well-established. However: (1) Published U-value range (0.14–0.28 W/m²K) is broad—likely reflects variation in edge losses, installation quality, and boundary conditions; no single 'typical' value is given. (2) Whole-building savings (35–46%) are project-specific and depend on baseline efficiency, climate, occupancy patterns, and what systems were replaced—not generalizable to all retrofits. (3) Durability data beyond ~15 years is sparse; vacuum seal integrity over decades and impact of thermal cycling on panel edges remain field-validation questions. (4) Cost premium vs. conventional insulation is not disclosed in the abstract; lifecycle cost is not addressed. (5) Fire classification, embodied carbon, and end-of-life recycling are not covered in the source material reviewed.
#thermal_retrofit #vacuum_insulation #facade_systems #heritage_compatible #embodied_carbon_reduction