Sod is the upper layer of soil held together by (usually grass) roots. It was used as a building material, in a similar way to soilbags.

    • SreudianFlip@sh.itjust.works
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      4 days ago

      Impermeable layer, usually skookum pond liner style, on top. Drainage. Ventilation and heating. Lime wash. Light helps if it can be managed in the design.