Banned for 90 Years, This Building Material Returns With 15x Concrete's Insulation and Centuries of CO₂ Storage [View all]
The inner core of the hemp stalk consists of a woody substance known as the hurd. When processing facilities separate these hurds from the outer fibers of the plant, the raw material is mixed with hydrated lime and water to initiate a chemical curing process.
A technical analysis published in an NCBI scientific review shows that the lime binder coats the porous hemp hurds, creating a lightweight matrix. Over time, the lime reacts with carbon dioxide in the air, undergoing a carbonation process that gradually converts the binder into calcium carbonate stone.
The resulting composite material provides a thermal insulation capacity that can be up to 15 times greater than standard concrete. This thermal efficiency helps stabilize indoor temperatures by reducing the rate of heat transfer through the exterior walls of a home.
The material also exhibits specific moisture-handling characteristics known as hygroscopic behavior. The open pore structure allows the walls to absorb water vapor from indoor spaces during periods of high humidity and release it when the air becomes dry.
This breathability prevents the accumulation of liquid water inside the wall assembly. By eliminating trapped moisture, the chemical composition of the lime binder maintains a high pH level that naturally resists the growth of mold and deters insect infestations.
https://dailygalaxy.com/2026/05/banned-for-90-years-this-building-material-returns-with-15x-concretes-insulation-and-centuries-of-co%e2%82%82-storage/
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