What are Unique Features of Dome-Shaped Earthbag Homes?

Earthbag Dome Construction

Dome-shaped earthbags require a specialized technique to achieve the curved shape. Builders can either use a formwork system or stack bags in a spiral pattern to create the dome shape. A commonly used method involves using a center pole and anchoring bags to it with barbed wire, then spiraling outward with each layer. The use of polypropylene bags, filled with a mixture of soil and gravel, provides the necessary strength and durability for the dome’s structure.

Structural Advantages

The dome shape of earthbag homes offers several structural advantages over traditional straight-walled designs. The curved shape distributes the weight of the structure evenly, reducing load-bearing stress on individual bags and the foundation. This design also provides natural resistance to seismic activity, as the weight of the structure is evenly distributed and less likely to collapse. In addition, the dome shape creates a spacious interior with high ceilings, making it ideal for homes and other structures that require a lot of interior space.

Plastering and Finishing

Once the earthbag dome is constructed, it’s necessary to apply a plaster finish to protect the bags from the elements and create a smooth surface. A mixture of sand, cement, and water is commonly used for plastering earthbag structures. The plaster is applied in multiple coats, with each coat being smoothed out before the next one is applied. A final coat of plaster can be textured or finished with a natural material like wood or stone to create a unique and attractive exterior finish.