For decades, aerogel sat firmly in the territory of space agencies and defence contractors. Too expensive, too specialist, too far removed from the world of cavity walls and loft conversions. That is changing fast. In 2025, aerogel blanket wrapping is moving into mainstream residential construction, and the implications for energy performance, retrofit design, and building regulations are significant.
Upgrading a heritage or period property?
Aerogel wrapping could be your best thermal solution. Explore our Building Materials guides at estateinnovation.com
What Is Aerogel and Why Does It Matter for Buildings?
Aerogel is a synthetic, ultra-porous material derived from silica gel, with air replacing nearly 99% of its volume. The result is one of the lightest solid materials ever created — and one of the most thermally resistant. Its thermal conductivity sits at around 0.015 W/mK, roughly half that of conventional mineral wool and significantly lower than expanded polystyrene (EPS).
In blanket or mat form, aerogel can be applied to walls, roofs, floors, and facades at thicknesses between 10mm and 30mm — delivering the equivalent thermal performance of 80–100mm of traditional insulation. That space saving is not a minor convenience. In dense urban retrofits, listed buildings, or narrow-cavity situations where conventional insulation simply cannot fit, aerogel opens doors that were previously closed.
From Spacecraft to Suburban Streets: The Commercial Shift
The material gained its reputation insulating NASA Mars rovers and oil pipelines in sub-zero conditions. Its leap into residential use has been enabled by two converging forces: manufacturing scale and tightening energy codes.
Manufacturers including Aspen Aerogels, Thermablok, and ROCKWOOL’s aerogel-enhanced product lines have driven production costs down substantially. Aerogel blanket products that cost upwards of £80 per square metre a decade ago are now available in the £20–40 range depending on specification — still a premium over mineral wool, but within striking distance for high-value or constrained projects.
Meanwhile, building regulations across the UK, EU, and parts of the US are demanding higher U-values from both new builds and retrofitted envelopes. Developers and architects working in tight spaces — mansion flat conversions, Victorian terraces, urban infill schemes — are finding that hitting thermal targets without losing floor area requires something aerogel can provide and standard insulation cannot.
Key Residential Applications in 2025
- Internal wall insulation (IWI) in heritage and listed properties where external cladding is prohibited
- Warm roof retrofits in low-ceiling loft spaces where every millimetre counts
- Floor insulation over underfloor heating systems in period buildings
- Balcony and terrace thermal breaks to eliminate cold bridging
- Passivhaus-standard new builds targeting near-zero heat loss
Aerogel vs Conventional Insulation: The Trade-offs
Aerogel is not a universal replacement. It outperforms on thermal resistance per millimetre without question. Where it asks more of specifiers and clients is on cost and acoustic performance. Mineral wool and EPS remain substantially cheaper per square metre and carry better sound absorption properties. For standard new-build cavity walls with no space constraints, they remain the sensible default.
The decision calculus shifts in retrofit, preservation, and high-specification residential work. If the brief includes a Grade II listed facade, a basement conversion with no external insulation option, or a Passivhaus retrofit where every thermal bridge matters, aerogel moves from luxury to logical choice.
What Specifiers and Contractors Need to Know
Most aerogel blanket products are flexible, vapour-permeable, and compatible with standard fixing systems. They can be taped at joints, cut with a knife, and overlaid with plasterboard or render finishes. Fire performance varies by product — silica-based aerogels are inherently non-combustible, but composite blankets with organic binders require checking against building regulation requirements, particularly post-Grenfell Part B compliance in the UK.
Installation is straightforward relative to the performance gain, but detailing at junctions and reveals matters enormously. A poorly detailed aerogel specification loses most of its advantage at thermal bridges. Training for site operatives is minimal but the design detailing stage deserves proper attention.
Subscribe to Estate Innovation for weekly updates on advanced building materials, construction technology, and energy performance innovation
The Outlook: Mainstream by 2027?
Several factors point toward aerogel becoming a standard specification item rather than a niche one within the next two to three years. The EU’s Energy Performance of Buildings Directive (EPBD) recast is pushing member states toward near-zero energy retrofits across existing residential stock. In the UK, the Future Homes Standard is raising the thermal bar for new builds. Both trajectories favour materials that deliver high performance in constrained conditions.
As supply chains mature and competition between manufacturers intensifies, the cost gap with conventional insulation will continue to narrow. Combined with growing contractor familiarity and a widening range of system products, aerogel blanket wrapping is on a clear path from specialist solution to mainstream option.
Aerogel blanket wrapping will not replace mineral wool across the board, and it should not try to. What it does is solve a specific and increasingly common problem: delivering serious thermal performance in spaces where conventional insulation cannot go. For retrofit specialists, heritage architects, and developers working at the performance edge, that capability is no longer a bonus — it is becoming a necessity.
