America's Hempcrete / Hemp-Lime Building Material
GaiaCrete™ — Bio-Based Hemp-Lime Building Material
GaiaCrete™ is Mr Hemp House®'s branded hempcrete / hemp-lime building material alternative — combining hemp hurd, natural hydraulic lime, and misc pozzolans and more into a bio-based insulation that is mold-resistant due to high-alkalinity mineral composition per lab testing, Class A flame spread rated (ASTM E84), and formulated with no added VOCs, with none detected in third-party testing. Now also available as GaiaBloc™ pre-formed blocks for retrofitting and new construction.
See The Transformation
From traditional wall systems to healthier living.
Living Room: Conventional vs. Healthier Materials
Bedroom: Conventional vs. Healthier Materials
Attic & Insulation: Conventional vs. Healthier Materials
What Is GaiaCrete™ Bio-Based Insulation?
GaiaCrete™ is a proprietary bio-based insulation system developed by Mr Hemp House®. Unlike traditional hempcrete, GaiaCrete™ is engineered with misc pozzolans and more for improved fire performance, consistency, and application flexibility. It is used as hemp-lime infill within a structural wall system, as a bio-based alternative to spray foam, fiberglass, and cellulose. Structural framing, engineering, connections, and code compliance are governed by the complete assembly.
Gaia™ Building Systems
GaiaCrete™ is the material at the center of a family of hemp-lime formats. Each format has its own product page.
GaiaBloc™ hemp-lime building blocks
Pre-formed block format for retrofit and new-construction wall infill.
GaiaPanel™ hemp-lime wall panels
Panelized wall system fabricated off-site for faster assembly.
GaiaCast™ cast-in-place hempcrete walls
Cast-in-place application for monolithic framed-wall infill.
Why Building Professionals Choose GaiaCrete™
Performance claims below reflect lab testing of GaiaCrete™ and published hemp-lime research. Results vary by formulation, assembly, climate, and installation.
100+ Year Service-Life Potential
Published hemp-lime lifecycle research cites service-life assumptions of more than 100 years for properly designed, constructed, protected, and maintained assemblies. Lime binders continue to cure over time through carbonation. This is not a GaiaCrete™ warranty.
Class A flame spread rating (ASTM E84)
No chemical fire retardants needed. GaiaCrete™ is naturally fire-resistant insulation — Class A flame spread rated with no added flame-retardant chemicals.
Mold-Resistant by Design
mold-resistant due to high-alkalinity mineral composition per lab testing. The lime-alkaline matrix (high alkalinity) inhibits fungal colonization.
Biogenic Carbon Storage
Stores biogenic carbon in the hemp hurd, and the lime binder reabsorbs CO₂ through carbonation over time. Net lifecycle figures vary by mix, transport, and assembly and are not published as a single number.
No Added VOCs
No added VOCs, with none detected in third-party testing. No formaldehyde, no isocyanates, no flame retardants. Vapor-permeable and humidity-regulating.
Superior Acoustic Performance
GaiaCrete™ naturally dampens sound transmission — reducing noise between rooms and from outside. Quieter homes without additional soundproofing products.
GaiaCrete™ Verified Performance Data
Lab-tested by independent facilities. Review the underlying technical documents on our resources page.
| Specification | GaiaCrete™ Value |
|---|---|
| Thermal Performance (R-Value) | R-2.5+ per inch (planning reference) |
| Fire Resistance | Class A flame spread rating (ASTM E84); no chemical flame retardants added |
| Mold Resistance | high alkalinity — mold-resistant per lab testing |
| VOC Emissions | No added VOCs — none detected in third-party testing |
| Biobased Carbon Content | 100% Biobased Carbon Content per ASTM D6866-22 (Beta Analytic, Cert. #531872642609133657, Oct 2022) |
| Carbon Impact | Stores biogenic carbon in the hemp hurd, and the lime binder reabsorbs CO₂ through carbonation over time. Net lifecycle figures vary by mix, transport, and assembly and are not published as a single number. |
| Service Life | 100+ year service-life potential documented in hemp-lime research; results vary by assembly and climate |
| Moisture Buffering | Vapor-permeable moisture buffering; performance varies by assembly and climate |
| Pest Considerations | Mineral-bound, high-alkalinity matrix with no food value for insects; field performance depends on detailing and assembly |
| Role in the Wall | Hemp-lime infill within a structural wall system; framing, engineering, connections, and code compliance are governed by the complete assembly |
| Application Methods | Spray, pour, panel, or GaiaBloc™ blocks |
Thermal performance figures are planning references only. Actual thermal performance varies by formulation, density, moisture content, installation method, and complete wall assembly.
Not Sure If GaiaCrete™ Is Right for Your Project?
Start with a free Home Health Score to understand your home's current health — then get a personalized GaiaCrete™ recommendation.
Best Use Cases for GaiaCrete™ Insulation
GaiaCrete™ and GaiaBloc™ blocks serve every building type — from single-family homes to commercial projects.
Residential Retrofits
Replace toxic spray foam or fiberglass in existing walls, attics, and basements with GaiaBloc™ blocks or poured GaiaCrete™.
New Home Construction
Build healthier from the ground up — spray, pour, or stack GaiaBloc™ blocks for a complete non-toxic thermal envelope.
Moisture & Mold Zones
Basements, crawl spaces, coastal homes — anywhere moisture causes problems, GaiaCrete™ is mold-resistant due to high-alkalinity mineral composition per lab testing.
Green & Net-Zero Builds
As a bio-based, carbon-storing material, GaiaCrete™ can support LEED, Passive House, and net-zero energy goals. Credit eligibility depends on project documentation.
GaiaBloc™ — Hemp-Lime in a Pre-Formed Block
Where a wet application is impractical, the same hemp-lime material family is available in a pre-formed block format for retrofit and new-construction wall infill.
GaiaBloc™ hemp-lime building blocksGaiaCrete™ vs Hempcrete vs Spray Foam: Full Comparison
See how GaiaCrete™ bio-based insulation compares across every performance metric. For deeper analysis, read our GaiaCrete™ vs spray foam and GaiaCrete™ vs fiberglass comparison guides.
| Feature | GaiaCrete™ | Traditional Hempcrete | Spray Foam |
|---|---|---|---|
| Material Type | Proprietary bio-based insulation | Hemp + lime mix | Petroleum-based polyurethane |
| Flame Spread (ASTM E84) | Class A flame spread | Class A flame spread typical; assembly ratings vary | Combustible; requires thermal barrier |
| Mold Resistance | mold-resistant due to high-alkalinity mineral composition | High-alkalinity binder; resistance varies by mix | Low vapor permeability; moisture management depends on assembly design |
| Embodied Carbon Considerations | Stores biogenic carbon; lime reabsorbs CO₂ over time. Lifecycle outcome depends on formulation, transport, and assembly | Stores biogenic carbon; lime reabsorbs CO₂ over time | Petrochemical feedstock; typically higher embodied carbon |
| VOC Profile | No added VOCs — none detected in testing | No added VOCs | Isocyanate-based chemistry; emissions vary by product and cure |
| Service Life | 100+ year service-life potential documented in hemp-lime research | Long service life documented in hemp-lime research | Service life varies significantly by product, assembly, exposure, installation quality, and maintenance |
| Role in the Wall | Hemp-lime infill within a structural wall system | Hemp-lime infill within a structural wall system | Cavity fill / air-sealing layer |
| Vapor & Moisture Behavior | Vapor-permeable; buffers humidity | Vapor-permeable | Low permeability (closed-cell); acts as a vapor retarder |
| R-Value / Inch | R-2.5+ per inch | Varies by mix & density | R-6 to R-7 |
| Installation | Spray, pour, panel, or GaiaBloc™ blocks | Hand-pack or slip-form | Professional spray only |
GaiaCrete™ thermal performance is a planning reference of R-2.5+ per inch. Actual thermal performance varies by formulation, density, moisture content, installation method, and complete wall assembly.
GaiaCrete™ Bio-Based Insulation Transforms Every Room
Compare Toxic vs Mold-Resistant GaiaCrete™ Insulation Rooms
Toxic drywall, fiberglass batts, plastic vapor barrier — off-gassing VOCs
GaiaCrete™ hempcrete, lime clay plaster, MgO board — no added toxic ingredients
Illustrative visual comparisons of conventional versus healthier material choices. Actual results vary by climate, home size, assembly, and installation. We do not make medical claims. For a cost estimate, use our cost calculator.
GaiaCrete™ Technical Data & Research
Independent lab results, carbon lifecycle analysis, and documented methodology.
Technical Specifications
R-value, fire rating, pH, VOC, and compressive strength lab data (ASTM certified).
Read on Resources PageHealthy Home Score™ Methodology
Evidence-based assessment protocol validated through Homes/Items Scanned Daily. Aligned with BPI, HUD, and EPA standards.
Read on Resources PageCarbon Lifecycle Analysis
Full ISO 14040 cradle-to-grave carbon accounting methodology. Stores biogenic carbon in the hemp hurd, and the lime binder reabsorbs CO₂ through carbonation over time. Net lifecycle figures vary by mix, transport, and assembly and are not published as a single number.
Read on Resources PageReady to Build With GaiaCrete™?
Get a free consultation and see how GaiaCrete™ hemp-lime material fits your project — mold-resistant characteristics, Class A flame spread (ASTM E84) for the tested material, biogenic carbon storage, and designed around the 100+ year service-life potential documented in hemp-lime research.
GaiaCrete™ FAQ
Frequently Asked Questions About GaiaCrete™ Hemp Insulation
GaiaCrete™ — A Modern Hempcrete Alternative
GaiaCrete™ is a modern hemp-lime building material — a bio-based building solution engineered to support breathable wall assemblies, healthier material selection, and long-lived non-toxic homes. Like traditional hempcrete, GaiaCrete™ uses a hemp-and-lime chemistry that lets walls manage moisture rather than trap it — a foundational principle behind wall assemblies that are designed to support mold-resistant performance when properly detailed.
Where GaiaCrete™ differs from traditional hempcrete is its proprietary blend, formulated to support consistent on-site application, predictable curing, and a finished wall that contributes no added VOCs to the indoor environment. Depending on assembly design, climate, and wall thickness, GaiaCrete™ may improve thermal performance compared with the simplest hempcrete mixes — but the larger story is the system: a breathable, bio-based wall built to keep indoor air cleaner over the life of the building.
For project budgeting, see the hempcrete house cost guide, and to weigh GaiaCrete™ against legacy insulation, read the full GaiaCrete™ vs fiberglass and GaiaCrete™ vs spray foam comparisons. Final performance always depends on assembly design, climate, and installation — the figures shown elsewhere on this page are typical, not guaranteed.
Related Pages & Resources
Most-Read Guides
Popular & Recent Articles
The most-read expert guides on hemp insulation, GaiaCrete™, healthy building, and non-toxic home renovation.
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The definitive 3,500+ word guide covering performance, cost, codes, and installation.
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Read articleHemp Tax Credits 2026
Federal and state incentives that can offset 30%+ of your hemp insulation investment.
Read articleHempcrete vs Spray Foam
Side-by-side performance, safety, off-gassing, and lifetime cost comparison.
Read articleMold-Resistant Building Guide
How high-alkalinity mineral composition walls make mold growth strongly inhibited — without chemicals.
Read articleIs Hemp Insulation Safe?
Fire, VOCs, mold, pests — every safety concern answered with data.
Read articlePopular Hempcrete Questions Asked to HempBuild Global Pro™
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GaiaCrete™ is being evaluated for the Minnesota Healthy Home Project — a planned cold-climate demonstration.