# Bio-isolation (hemp wool, mycelium, straw, cork) Bio-based building insulation materials including hemp wool, mycelium composites, straw panels, and expanded cork. Source: https://en.bioecon.ru/technology/bio-isolation/ Updated: 2026-08-18 ## Overview and value chain Markers: [EC: Bio-based Insulation | OECD: bio-materials | Regulator: EPA, REACH, ADEME] The bio-based building insulation sector is one of the fastest-growing and ecologically significant segments of the modern circular construction bioeconomy. Traditional insulation materials like mineral wool, fiberglass, and polyurethane foam carry extremely high embodied carbon, requiring temperatures over 1400°C to melt stone or glass, or relying on petrochemical feedstocks. Bio-insulation materials offer thermal conductivities around 0.038 W/m·K, comparable to synthetic options, while acting as carbon sinks. 1 kg of bio-insulation can sequester up to 2.0 kg of atmospheric CO2, transforming buildings from carbon emitters to carbon storage banks. The key directions of bio-isolation are: 1. **Hemp Wool:** Soft, elastic insulation mats made from hemp bast fibers combined with biopolymer binders. 2. **Mycelium Insulation:** Biocomposites where fungal mycelium binds agricultural waste into lightweight, rigid boards. 3. **Straw Panels:** High-density boards produced by heat-pressing straw, utilizing natural lignin as a binder. 4. **Expanded Cork:** Natural, sustainable insulation made by expanding cork bark granules with steam, requiring no synthetic glues. ### Sectoral value chain ``` [Agricultural Feedstock] ──> [Fiber Preparation] ──> [Compounding] ──> [Molding & Bonding] │ (Drying) │ ▼ [Installed Insulation] <─── [Finishing & Packaging] <─────┘ ``` ### Value chain levels | Level | Description | Key inputs/outputs | |:---|:---|:---| | **Agricultural Feedstock** | Harvesting hemp, straw, or cork. | **In:** Farmland, seeds, bark.
**Out:** Raw plant material. | | **Fiber Preparation** | Processing raw material into fibers or granules. | **In:** Raw straw, hemp stalks.
**Out:** Calibrated fibers. | | **Compounding** | Mixing fibers with binders or mycelium spawn. | **In:** Fibers, PLA, fungal spawn.
**Out:** Moist substrate. | | **Molding & Bonding** | Shaping and binding the material into boards. | **In:** Substrate, molds.
**Out:** Formed wet boards. | | **Finishing & Packaging** | Trimming, fire-retardant treatment, and packing. | **In:** Formed boards, borates.
**Out:** Packaged insulation. | | **Installed Insulation** | Integration into building walls and roofs. | **In:** Packaged insulation.
**Out:** Energy-efficient buildings. | Cross-cutting technologies of the sector: - **Airlaid Carding:** Aerodynamic web forming for soft, resilient fiber mats. - **Solid-State Fermentation:** Cultivating mycelial networks within agricultural substrates. - **Steam Expansion:** Utilizing superheated steam to naturally expand and bind cork granules. --- ## US The US is actively expanding the use of bio-insulation, supporting biotech materials startups to reduce building heat loss and lower embodied carbon. ### DOE efficiency, Green purchasing, Mycelium scaling - **Federal initiatives:** The DOE provides grants for high-efficiency, low-carbon building materials. - **Mycelium leadership:** US startups pioneer global licensing of mycelium-based composite technologies. - **Hemp infrastructure:** New large-scale manufacturing facilities are coming online to produce hemp wool insulation. --- ## CN China focuses on massive-scale utilization of agricultural residues, primarily straw, to produce dense ecoboards and prevent field burning. ### Straw utilization, Green building targets, Biomass R&D - **Policy mandates:** MOHURD requires a 30% increase in renewable building materials by 2030. - **Industrial scale:** Massive factories process wheat and rice straw into formaldehyde-free structural and insulation boards. - **Academic research:** Institutes develop advanced fungal strains for rapidly growing mycelium composites on rice husks. --- ## EU The European Union leads global regulation of bio-based construction materials, driving adoption through strict building codes and subsidies. ### RE2020 mandate, Wood fiber dominance, Cork insulation - **Regulatory drivers:** France's RE2020 imposes strict limits on embodied carbon, heavily favoring bio-sourced insulation. - **Market leaders:** European companies dominate global production of wood fiber, hemp, and cork insulation. - **Deep renovation:** The EU Renovation Wave prioritizes bio-insulation for retrofitting the existing building stock. --- ## Leading companies and research institutes | Company / Institute | Country | Key products / platforms | Tech features | Status 2026 | |:---|:---|:---|:---|:---| | **Steico SE** | 🇩🇪 Germany | *Wood & hemp insulation* | Flexible fiber mats | commercial | | **Amorim Cork** | 🇵🇹 Portugal | *Expanded Cork Board* | Steam expansion | commercial | | **Hempitecture** | 🇺🇸 USA | *HempWool®* | Airlaid fiber webs | commercial | | **Ecovative Design** | 🇺🇸 USA | *MycoComposite®* | Solid-state fermentation | commercial | | **Biofib'** | 🇫🇷 France | *Biofib' Trio* | Multi-fiber blends | commercial | | **Wanhua Ecoboard** | 🇨🇳 China | *Straw panels* | Large-scale hot pressing | commercial | --- ## Tech stack and innovations Bio-insulation development relies on textile non-woven processes, solid-state fungal fermentation, and the thermodynamics of porous systems. 1. **Airlaid Carding and Thermal Bonding:** - Hemp fibers (85%) are mixed with bio-based PLA binder fibers (15%). - An aerodynamic process forms a bulky web which is thermally bonded at 145°C. 2. **Solid-State Fermentation of Mycelium:** - Sterilized agricultural waste is inoculated with fast-growing fungal strains. - Mycelium networks bind the substrate in 5–7 days before thermal deactivation at 85°C. 3. **Steam Expansion of Cork:** - Cork granules are subjected to superheated steam at 300°C. - Granules expand by 30% and natural suberin melts, acting as an organic binder. --- ## Value chains and production pipelines ### Industrial pipeline of Hemp Wool Insulation Production (ISO 9001) ``` ┌───────────────────────────┐ ┌───────────────────────────┐ │ 1. Fiber Blending │ ───> │ 2. Airlaid Web Forming │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 4. Fire Retardant Coating │ <─── │ 3. Thermal Bonding │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 5. Cutting & Packaging │ ───> │ 6. Quality Testing │ └───────────────────────────┘ └───────────────────────────┘ ``` #### Stage 1: Fiber Blending Bale openers dose and mix purified hemp bast fibers with low-melting PLA binder fibers, creating a homogenous blend. #### Stage 2: Airlaid Web Forming The fiber blend is blown pneumatically onto a moving mesh conveyor under vacuum, forming a thick, randomly oriented fiber mat. #### Stage 3: Thermal Bonding The web passes through a continuous convection oven at 145°C, melting the outer sheath of the PLA fibers to create strong, elastic bonding points. #### Stage 4: Fire Retardant Coating A high-pressure spray applies a fine mist of environmentally safe borates to the moving web, ensuring class B fire resistance. #### Stage 5: Cutting & Packaging Automated knives cut the continuous mat into standard batts, which are then compressed into biodegradable shrink wrap to minimize shipping volume. #### Stage 6: Quality Testing Samples are tested using heat flow meters to verify thermal conductivity (0.039 W/m·K) and checked for dimensional recovery after compression.