Rammed Earth
Rammed earth is a technique in which structural walls of a house are built by compacting a soil-cement mixture within plywood forms. The forms are then removed, leaving solid earth walls 18 to 24 inches thick. The earth used for the walls is usually a screened, engineered soil. The soil on the site can be used if it has a proper sand/clay ratio. The earth is mixed with about 8% water and 3% cement. This mixture is placed in the forms in 8" thick layers that are compacted into 5" thick layers. Because of the cement in the mixture, rammed earth structures are waterproof.

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