Best Materials for Plastering Earthbag Domes?

Choosing the Right Plaster Mix

When selecting a plaster mix for earthbag domes, it’s essential to consider factors such as durability, breathability, and sustainability. A good plaster mix should be able to withstand various environmental conditions, including temperature fluctuations, humidity, and exposure to wind and rain. A mix of natural lime, sand, and pozzolana is an excellent choice, as it provides excellent durability, breathability, and sustainability.

To create this mix, combine 3 parts of natural sand with 1 part of pozzolana and 1 part of natural lime. Add water gradually to achieve the desired consistency. The mixture should be workable but not too runny. Apply the plaster mix to the earthbags using a trowel or a spray gun, making sure to cover the entire surface evenly.

Reinforcing the Plaster

Reinforcing the plaster with a mesh is crucial to prevent cracking and ensure the plaster’s integrity. Barbed wire or nylon mesh can be used for this purpose. Attach the mesh to the earthbags using a wire or a staple gun, making sure it’s taut and evenly spaced. Apply the plaster mix over the mesh, pressing it firmly into the earthbags.

Applying the Final Coat

For the final coat, a combination of acrylic latex and Portland cement can be used. Mix the two materials in a 1:1 ratio with water, and apply it to the earthbags using a spray gun or a trowel. This coat should be smooth and even, without any drips or runs. Allow the final coat to dry completely before applying a sealant or a topcoat to protect the plaster from the elements.