How Fungi Are Being Used to Grow the Next Generation of Building Materials

The built environment is responsible for nearly 40% of all global carbon emissions, a staggering figure driven largely by the materials we use to construct our homes and cities. Traditional building staples like concrete, steel, and synthetic insulation foams are manufactured in high-heat kilns and chemical baths, locking in massive amounts of embodied carbon before a building is even occupied.[7]

But as the construction industry faces tightening environmental regulations in 2026, a quiet revolution is taking root. Architects and engineers are increasingly swapping extractive manufacturing for biological cultivation, turning to the natural world to "grow" the next generation of building materials.[4][7]

The engine behind this shift is mycelium—the dense, microscopic root-like network of fungi that thrives beneath the forest floor. While mushrooms are the visible fruiting bodies, the subterranean mycelium acts as nature's ultimate binder, capable of breaking down organic matter and weaving it into a resilient, unified structure.[4]

By harnessing this biological process, bio-engineers are now producing commercial-grade insulation panels, acoustic boards, and non-load-bearing bricks. The process is remarkably efficient, requiring a fraction of the water and electricity needed to manufacture conventional petrochemical plastics.[5]

The manufacturing mechanism begins not in a quarry or an oil refinery, but with agricultural or construction waste. Substrates such as hemp hurd, sawdust, rice hulls, or paper industry byproducts are collected and sterilized.[2][5]

This loose waste is then inoculated with specific fungal spores—most commonly robust species like oyster mushrooms or Trametes versicolor, known as turkey tail. The inoculated mixture is packed into custom molds that dictate the final shape of the architectural product, whether that is a flat insulation sheet or an interlocking brick.[1][3][4]

Over the next five to seven days, the material is left in a dark, climate-controlled environment with high humidity. The mycelium rapidly colonizes the substrate, extending microscopic threads called hyphae that digest the organic waste and bind the loose particles into a dense, solid matrix.[3][7]

Once the mycelium has fully formed the desired shape, the bio-composite undergoes a crucial final step: heat treatment. The panels are baked at high temperatures to completely terminate all biological activity, ensuring that the finished building material is inert and will not sprout mushrooms or continue growing inside a home's walls.[3][7]

The resulting material is a structural marvel with a profoundly different environmental footprint. Recent life cycle assessments published in 2026 demonstrate that mycelium-based bio-composites achieve a 91% to 95% reduction in embodied carbon emissions compared to traditional masonry units.[2]

Insulation has emerged as the primary commercial battleground for this technology. Conventional polyurethane and extruded polystyrene foams are derived from fossil fuels, require immense energy to produce, and release toxic volatile organic compounds as they degrade over time.[5]

Mycelium insulation, by contrast, naturally traps air and water vapor within its cellular network, providing thermal and acoustic performance that rivals or exceeds synthetic mineral wool. Because it is vapor-permeable, it also helps regulate indoor humidity and prevents the accumulation of dampness that leads to toxic mold.[5][6]

The technology is also solving adjacent waste crises. In a May 2026 breakthrough, researchers at the University of Bath successfully utilized turkey tail fungi to break down oriented strand board (OSB)—an engineered wood product heavily treated with synthetic resins that is notoriously difficult to recycle and often ends up in landfills.[1]

The fungi effectively digested the toxic adhesives in the OSB waste, transforming a hazardous construction byproduct into high-grade, low-carbon insulation. The resulting biomaterial matched the thermal performance of conventional polystyrene while generating ten times fewer carbon emissions during production.[1]

Commercial applications are rapidly moving from the laboratory to the job site. In the United Kingdom, startups like Mykor are repurposing thousands of tonnes of paper industry waste to bio-assemble their MykoSlab insulation sheets, which are designed as direct, drop-in replacements for standard plastic foams.[5]

The material is also proving its viability in diverse global climates. In Nairobi, the newly developed Mosaic Co-living Residences integrated mushroom-based insulation panels from local manufacturer MycoTile, utilizing regional agricultural waste to naturally regulate indoor temperatures without relying on energy-intensive air conditioning.[6]

Beyond thermal regulation, mycelium composites offer exceptional natural fire resistance. The high silica content found in agricultural substrates like rice hulls, combined with the mycelium's natural tendency to form a protective char layer, allows these panels to meet strict commercial fire codes without the addition of toxic chemical flame retardants.[2][7]

Researchers are now pushing the boundaries of what fungi can build. At the University of British Columbia, biogenic architecture labs are utilizing 3D printers to extrude living mycelium hydrogels, allowing architects to print complex, tunable structures that grow into their final hardened forms.[3]

Despite the rapid advancements, mycelium is not yet ready to replace the steel and concrete skeletons of modern skyscrapers. The material's compressive strength currently ranges from 0.30 to 1.20 megapascals—ideal for interior partitions, acoustic cladding, and insulation, but vastly insufficient for load-bearing structural foundations.[2][7]

Engineers also face ongoing questions regarding the material's long-term moisture resistance in extreme, unprotected outdoor environments. Consequently, most current commercial applications are strictly designated for interior use or require protective exterior sheathing to prevent degradation.[7]

Nevertheless, as global building codes increasingly mandate strict limits on embodied carbon, bio-fabricated materials offer a highly scalable solution. By transforming agricultural and construction waste into high-performance shelter, mycelium is proving that the future of sustainable architecture may be grown rather than built.[4][7]