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Polypropylene bags are generally preferred since they will not be affected by moisture and are stronger than burlap, however you do have to be careful to keep them away from exposure to the sunlight, since the UV rays will deteriorate the material. Another prime ingredient of earthbag building is barbed wire, which is strung (usually two lines of it) between each course of bags. This helps hold the walls together and makes the structure much more earthquake resistant.

The ideal type of soil to fill the bags with is a mix of some clay and some sand, because this will pack into a rather solid block when moistened and compacted, similar to adobe blocks. A very fine, loose sand can actually be a problem because it may not pack well and is vulnerable to shifting its shape later. I used a crushed volcanic stone know as scoria to build my house in Colorado, and this worked out well because it is a natural insulating material…as are the rice hulls.

Earthbag building is extremely versatile in the styles that can be made; they are especially well-adapted to circular and domed structures, but more conventional vertical walled buildings are also possible. In all cases it is important to pay attention to engineering requirements to assure stability. For instance vertical walls may require periodic buttressing. Domes have actually been proven to be very resistant to the forces of earthquakes.

Earthbag buildings have been successfully constructed on every continent and in most climates, including fairly humid places. As with most other methods of building it is important to pay attention to drainage and roof design to keep the bulk of the moisture well away from the walls. Earthbags have the advantage of being able to tolerate moist situations, and they are actually being used as foundations (along with rubble trenches) as foundations for other types of building, such as straw bales.

I suggest that you take a look at my website and you will be amazed at all the ways that earthbags have been used around the world!