The Model B’s walls are formed from a patent-pending mixture of soil, sand, slaked lime, and natural fibers. This composition achieves structural strength approximately five times greater than the company’s earlier prototype, which relied on cement. It also meets Japan’s highest seismic safety rating (Grade 3).
By removing cement entirely, Lib Work has reduced the home’s embodied carbon footprint by more than half—from roughly 45,000 kg of CO₂ to about 22,434 kg per home. These reductions reflect the broader climate benefits of moving away from carbon-intensive materials in the building sector.
In its July 2025 announcement, the company described the new construction approach as a milestone in sustainable housing. “Features of Lib Earth House Model B redefine homes: creating the sustainable earthen walls. Compared to the previous model, strength improved by about five times,” a company spokesperson said via LinkedIn and Designboom reports.
The home’s layout includes a living/dining/kitchen area, bathroom, toilet, and a central courtyard. Its design takes advantage of natural light and ventilation, reducing the need for mechanical heating and cooling and enabling occupants to live in closer rhythm with seasonal changes.
The Lib Earth House Model B demonstrates how the construction industry can integrate traditional materials with modern 3D printing to achieve both climate and safety goals. Cement-free manufacturing offers a viable pathway to lowering embodied carbon, while enhanced structural performance addresses resilience in earthquake-prone regions.
