Product · Building Envelope
Product · InnDex 58 · Evidence provided · High specification risk
Nanoporous silica insulation achieving high R-value in minimal thickness for constrained envelope assemblies.
Aerogel is a synthetic solid with a nanoporous silica matrix (pore size 20–40 nm) in which gel liquid is replaced by air, suppressing convective and conductive heat transfer. It directly addresses the AEC constraint of achieving high thermal resistance (R-value per inch) in thin-wall retrofits, facade cavities, and high-performance envelope designs where conventional bulk insulation cannot fit. Commercial products (Aspen Aerogel blankets, Cabot Spaceloft) exist with documented deployment in building envelopes, cryogenic systems, and industrial pipework, though mainstream residential and commercial adoption remains limited.
Aerogel insulation achieves R-5 to R-7 per inch through a nanoporous silica matrix that suppresses all three heat-transfer modes simultaneously — roughly two to three times the performance of conventional foam — making it the engineering answer to depth-constrained thermal assemblies in heritage retrofits, slim-profile facades, and high-performance new-build where bulk insulation cannot fit. Commercial products exist and have been deployed in building envelopes, cryogenic systems, and industrial pipework; Aspen Aerogel blankets and Cabot Spaceloft are market references with documented performance data. The case for aerogel narrows significantly when the cost is examined: at 5–10 times the cost of conventional insulation per R-value unit, the business case is confined to projects where depth genuinely cannot be traded off against budget — and that is a smaller population than the thermal performance figures alone might suggest. Two high-severity risks shape specification: moisture absorption degrades R-value and may cause structural compromise, requiring meticulous vapour barrier design and long-term maintenance discipline; and the material is mechanically fragile, demanding protective jacketing and installation workflows that are unfamiliar to most building trades. For a specifier, the qualifying question is whether the project genuinely has a depth constraint that no other insulation system can solve — if it does, aerogel is the right answer; if it does not, the cost and handling complexity are hard to justify.
Thermal performance (0.013–0.020 W/m·K) is well-documented in peer-reviewed literature and product datasheets. Commercial products are real and in use, but deployed primarily in specialist segments (cryogenic, aerospace, high-end retrofit) rather than mainstream new construction. Price premium remains substantial (3–10× mineral wool); no major long-term durability data for building envelope exposure >20 years in AEC contexts. Water absorption and hydrophobic treatment longevity under humid conditions not fully characterized in open literature. Fire performance claims (often rated A1/A2) depend on binder chemistry; some formulations use organic resins that may not be non-combustible.
#thermal_insulation #nanoporous #retrofit #thin_assembly #high_performance_envelope