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This type of alternative building is also known as pisé de terre or pisé. It can be built for no more than two-thirds the cost of a standard frame house.
Rammed earth is a building technique that employs damp soil mixed with some sort of stabilizer, lime or animal blood in ancient times, concrete today, and poured four to ten inches thick into a framework. A pneumatically-powered backfill tamper is then used to compact material to about half its original depth. The process is repeated until the wall reaches the desired height. The forms can be removed immediately because the walls are so solid. If wire-brushing, to add texture, is desired then the forms must be immediately removed: the wall becomes too hard to brush after an hour.
The framework is most commonly made of reinforced plywood, but sheet metal and glass fiber can also be used. The forms can be reused. Re-bar, wood, or bamboo can be used to reinforce the walls to help prevent failure during earthquakes and strong storms.
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