Summarize this article with:
A material that is 99% air yet blocks heat better than any traditional insulation on the market.
Sounds impossible. It’s not.
Understanding what is aerogel insulation matters if you’re tackling tight spaces, historic building retrofits, or high-performance construction where every millimeter counts.
NASA used it on the Mars Rover. Now it’s available for your walls.
This guide covers how aerogel works, its R-value compared to fiberglass and spray foam, product types from manufacturers like Aspen Aerogels and BASF, installation methods, realistic costs, and whether the premium price delivers real value for residential projects.
By the end, you’ll know exactly where aerogel makes sense and where conventional home insulation still wins.
What is Aerogel Insulation
Aerogel insulation is a synthetic porous material derived from silica gel where the liquid component has been replaced with air through supercritical drying.
The result is an ultralight solid that is roughly 99% air by volume.
Samuel Stephens Kistler invented this material in 1931 after a bet with a colleague about removing liquid from gel without shrinkage.
NASA later adopted aerogel for the Mars Rover and Stardust spacecraft, earning it the nickname “frozen smoke” due to its translucent, smoke-like appearance.
Today, manufacturers like Aspen Aerogels, BASF, and Cabot Corporation produce commercial aerogel products for building applications.
Understanding how insulation works helps explain why aerogel performs so well.
How Does Aerogel Insulation Work
Aerogel blocks heat transfer through its unique nanopore structure, which contains billions of tiny air pockets smaller than the mean free path of air molecules.
This phenomenon, called the Knudsen effect, restricts molecular movement and nearly eliminates convection within the material.
What Makes Aerogel a Good Insulator
Three heat transfer methods exist: conduction, convection, and radiation.
Aerogel disrupts all three; the nanopores prevent convection, the silica skeleton has low conduction, and opacifiers can block infrared radiation.
What is the Thermal Conductivity of Aerogel
Thermal conductivity measures how quickly heat passes through a material.
Commercial aerogel products range from 0.013 to 0.024 W/mK, compared to 0.025 W/mK for still air.
According to Thermtest laboratories, aerogel blankets tested at 0.024 W/mK at 20 degrees Celsius, confirming manufacturer specifications.
What is the R-Value of Aerogel Insulation
Aerogel delivers an R-value of approximately R-10.3 per inch, making it one of the highest-performing insulation materials available.
For comparison, traditional wall insulation achieves only R-13 for a full 3.5-inch cavity.
Aerogel reaches similar performance in just 1.25 inches.
How Does Aerogel R-Value Compare to Fiberglass
Fiberglass insulation provides R-3.5 to R-4 per inch.
Aerogel outperforms it by roughly 2.5 times, allowing thinner wall assemblies with equal or better thermal resistance.
How Does Aerogel R-Value Compare to Spray Foam
Closed-cell spray foam insulation offers R-6 to R-6.5 per inch.
Aerogel still beats it by about 60%, though spray foam costs significantly less per square foot.
Among various types of insulation materials, aerogel sits at the top for thermal performance.
What Types of Aerogel Insulation Products Exist
Manufacturers produce aerogel in three primary forms: blankets, panels, and strips.
Each serves different applications depending on flexibility requirements and installation location.
What is Aerogel Blanket Insulation
Aerogel blankets combine silica aerogel with fiber reinforcement (typically fiberglass or polyester) to create flexible, durable rolls.
Aspen Aerogels offers blankets in 0.2 and 0.4-inch thicknesses, 57 inches wide.
Unlike traditional blanket insulation, aerogel versions resist moisture and maintain performance over time.
What is Aerogel Panel Insulation
Slentite panels from Aerogel-it (developed in BASF laboratories) provide R-8 per inch in a rigid, machinable board.
At just 13-15mm thick, these panels fit where traditional rigid foam board insulation cannot.
They are waterproof, dust-free, and maintain insulative performance without degradation.
What is Aerogel Strip Insulation
Thermoblok manufactures 1.5-inch wide aerogel strips specifically for covering framing studs.
Price runs about $1.99 per linear foot.
These strips target thermal bridging rather than full cavity fill.
Where Can Aerogel Insulation Be Used in a Home
Aerogel works in walls, attics, around pipes, and anywhere space constraints limit traditional insulation thickness.
Its thin profile makes it especially valuable for retrofit projects in older buildings.
Can Aerogel Be Used in Wall Cavities
Yes, though cost often limits full cavity fill to high-performance buildings or superinsulation projects.
Most installers use aerogel strips over studs combined with conventional cavity insulation for cost-effective thermal bridging reduction.
Can Aerogel Be Used for Thermal Bridging
This is aerogel’s sweet spot for residential use.
Applied over wood or metal studs, thin aerogel strips cut heat loss through framing members by up to 40% according to Department of Energy research.
Can Aerogel Be Used in Attic Spaces
Aerogel blankets can insulate attic hatches, knee walls, and tight spaces around ductwork.
For full attic coverage, the high cost per square foot makes conventional materials more practical.
How is Aerogel Insulation Installed
Aerogel installation varies by product form, but most methods require no specialized equipment beyond standard construction tools.
Blankets cut with utility knives or scissors; panels need fine-toothed saws for clean edges.
What Tools Are Needed for Aerogel Installation
Basic toolkit: utility knife, straightedge, measuring tape, adhesive (for panels), and mechanical fasteners or tape for blankets.
A thermal imaging camera helps verify coverage and identify gaps after installation.
Can You Install Aerogel Insulation Yourself
DIY installation is possible for strips and blankets; panels require more precision.
Wear a respirator and gloves since aerogel particles can irritate skin and airways during cutting.
How Much Does Aerogel Insulation Cost
Aerogel remains the most expensive insulation option on the market, typically 5-10 times the cost per square foot for insulation compared to conventional materials.
Prices have dropped significantly since 2000 but still limit widespread residential adoption.
What is the Price Per Square Foot of Aerogel
Aerogel blankets run $5-15 per square foot depending on thickness and manufacturer.
Thermoblok strips cost roughly $1.99 per linear foot; Slentite panels range $50-110 per panel (approximately 2 sq ft each).
Is Aerogel Insulation Worth the Cost
Worth it for space-constrained retrofits, passive house insulation projects, and thermal bridging solutions where thin profiles justify the premium.
Calculate the payback period for insulation upgrades before committing to full aerogel coverage.
Check if you qualify for an insulation tax credit or weatherization rebate to offset costs.
What Are the Advantages of Aerogel Insulation
Beyond thermal performance, aerogel offers fire resistance, water repellency, acoustic dampening, and an extremely thin profile.
These properties earned aerogel 15 Guinness World Records entries before 2011.
Is Aerogel Fire Resistant
Silica aerogel melts at 1,200 degrees Celsius (2,192 degrees Fahrenheit), making it effectively non-combustible for building applications.
This high insulation fire rating meets strict building codes that restrict foam insulation in mid-rise and high-rise construction.
Is Aerogel Insulation Waterproof
Most commercial aerogel products are hydrophobic, meaning they repel water rather than absorb it.
Unlike cellulose insulation or fiberglass batts, aerogel maintains R-value even in humid conditions, eliminating the need for separate vapor barrier layers in some assemblies.
How Thin Can Aerogel Insulation Be
Aerogel blankets start at 0.2 inches (5mm); panels at 13mm.
A 10mm aerogel layer provides equivalent thermal resistance to 50mm of traditional foam, cutting wall thickness by 80%.
What Are the Disadvantages of Aerogel Insulation
High cost, dust generation during cutting, and fragility in pure form limit aerogel’s residential market penetration.
Production complexity keeps prices elevated despite decades of research.
Does Aerogel Insulation Create Dust
Cutting aerogel releases fine silica particles that irritate respiratory passages and dry out skin.
The International Agency for Research on Cancer notes amorphous silica appears on hazardous substance lists in California and New Jersey; proper PPE is non-negotiable.
Is Aerogel Insulation Fragile
Pure aerogel shatters like glass under pressure.
Commercial products solve this through fiber reinforcement, creating flexible blankets that bend without breaking, though panels remain more delicate than XPS or EPS foam boards.
Who Invented Aerogel
Samuel Stephens Kistler created aerogel in 1931 at the College of the Pacific in Stockton, California.
The invention resulted from a bet with Charles Learned about whether gel structure would survive liquid removal.
Kistler’s sol-gel process and supercritical drying method remain the foundation for modern aerogel production, though ambient pressure drying techniques now offer lower-cost alternatives.
Which Manufacturers Make Aerogel Insulation
Several companies produce aerogel for building applications:
- Aspen Aerogels (Northborough, MA) – blanket insulation for industrial and building use
- Cabot Corporation (Boston, MA) – aerogel particles and granules
- BASF/Aerogel-it (Germany) – Slentite rigid panels
- Thermoblok – strips for thermal bridging
- Aerogel Technologies LLC – research-grade and specialty aerogels
- Liatris Inc (Maryland) – next-generation ambient-dried aerogel composites
The global aerogel market is projected to reach $2 billion, with building insulation driving significant growth alongside oil and gas, aerospace, and automotive applications.
A home energy audit can determine whether aerogel makes sense for your specific retrofit insulation project or if conventional materials deliver better ROI on insulation investment.
FAQ on What Is Aerogel Insulation
Is aerogel insulation safe to handle?
Aerogel is non-toxic but creates fine silica dust when cut. Wear gloves and a respirator during installation. The material can dry out skin and irritate airways. Once installed behind drywall, it poses no ongoing health concerns.
How long does aerogel insulation last?
Aerogel insulation has no known degradation timeline. Unlike foam products, it doesn’t off-gas or lose R-value over decades. Fiber-reinforced blankets and panels maintain thermal performance indefinitely under normal building conditions without insulation settlement.
Can aerogel insulation get wet?
Commercial aerogel products are hydrophobic, repelling water on contact. They won’t absorb moisture or lose insulating ability when exposed to humidity. This makes aerogel suitable for insulating basement walls and other high-moisture locations.
What is aerogel insulation made of?
Most building aerogels use silica dioxide (silicon-based gel) processed through sol-gel chemistry. The liquid component is replaced with air via supercritical or ambient pressure drying. Commercial products add fiber reinforcement for flexibility and durability.
Where is aerogel insulation commonly used?
Primary applications include pipe insulation, thermal bridging mitigation over studs, external wall insulation retrofits, and space-constrained renovations. Industrial uses span oil pipelines, aerospace, refrigeration, and cryogenic systems.
Can you buy aerogel insulation at Home Depot or Lowe’s?
Major home improvement stores don’t typically stock aerogel. Purchase directly from manufacturers like Aspen Aerogels, through specialty distributors like BuyAerogel.com, or from industrial suppliers. Thermoblok strips have slightly wider retail availability.
Does aerogel insulation require a vapor barrier?
Often no. Aerogel’s hydrophobic properties and moisture management eliminate the need for separate vapor barrier insulation in many assemblies. Check local building codes and consult manufacturer guidelines for your specific climate zone and wall design.
Is aerogel better than closed-cell spray foam?
Aerogel offers higher R-value per inch (R-10 vs R-6.5) and better fire resistance. Closed-cell insulation costs far less and provides air sealing in one step. Choose based on budget and space constraints.
Does aerogel work in cold climates?
Aerogel excels in cold climates where maximizing R-value in minimal thickness matters most. Research from cold-region building studies confirms aerogel maintains performance at extreme low temperatures. It’s used in subsea pipelines and cryogenic applications.
Is aerogel insulation eco-friendly?
Aerogel is non-toxic, recyclable, and can be produced from organic precursors like cellulose. Its thin profile reduces material use. However, traditional supercritical drying consumes significant energy. Newer ambient drying methods address this environmental concern.
Conclusion
Understanding what is aerogel insulation comes down to one fact: it delivers the highest thermal resistance per inch of any building material available today.
Samuel Stephens Kistler’s 1931 invention now serves everyone from homeowners tackling historic building retrofits to engineers designing energy-efficient building envelopes.
The tradeoff is clear. Premium performance at premium cost.
Aerogel makes sense for thermal bridging mitigation, space-constrained wall assemblies, and projects chasing LEED certification for insulation performance.
For standard cavity fill, conventional materials still win on cost-effectiveness.
Run a blower door test to identify where your building envelope leaks most, then decide if aerogel’s thin, hydrophobic, fire-resistant profile justifies the investment for your specific situation.
