Every time a building is built or demolished, dumpsters full of construction waste head to landfills—and each year in the U.S., the construction and demolition industry generates around twice as much trash as all of the other waste in cities. The materials often can’t easily be recycled. But by redesigning common materials, a U.K.-based startup called Biohm is working to help the industry shift to a circular model.
At a factory a few hours west of London that will open early next year, the company will soon begin mass-producing its first product: insulation made from mycelium, the thread-like roots that connect mushrooms. The material is biodegradable and eliminates other environmental problems caused by typical foam insulation. But it also outperforms the standard product.
“We found that mycelium, or mushroom-based networks and structures, are incredibly similar to the structures that you get in engineered plastic-insulation products,” says Ehab Sayed, founder and director of innovation at Biohm. In tests, they found that the material does a better job of insulating than alternatives like foam, with less thermal conductivity, and in a fire, it’s slower to burn. Tests also suggest that it’s as durable as standard insulation. But unlike standard insulation, it can be safely composted at the end of its life, or easily reused to make more insulation.The company’s current facility will produce the insulation at a small scale, with enough for around 30 homes a month. Still, even as it’s first launching, the cost of the product can compete with higher-end insulation. As it scales up production, the cost will come down far enough that the product can be used in affordable housing. The fact that the company uses waste helps reduce the cost. “The only two ingredients are the waste stream for the feedstock, which is a waste that we collect as a waste collection service, and the mycelium, which we culture and grow ourselves in our facilities,” says Sayed. “So you basically have no raw material that you’re having to pay for us to start with, which really makes things more achievable when you’re producing at scale.”
Corrections: We’ve updated this article to reflect that the company does not use sawdust as a feed for the mushrooms and eliminate references to the British Board of Agrément’s rating of the product; the board provides accreditation but does not give official ratings.
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