What are Advantages of Using Natural Plaster on Earthbags?

Durability and Weather Resistance

Natural plaster, typically made from a combination of lime, sand, and water, is an excellent choice for earthbag structures due to its superior durability and weather resistance. When applied correctly, natural plaster can last for decades with minimal maintenance. Unlike synthetic plasters, natural plaster can breathe and expand with the earthbags, reducing the risk of cracks and damage.

Aesthetics and Thermal Mass

Natural plaster not only enhances the appearance of an earthbag structure but also increases its thermal mass. By applying a 1-2 inch (2.5-5 cm) layer of natural plaster, you can significantly improve the building’s ability to regulate temperature and retain heat. This is particularly beneficial in regions with extreme temperature fluctuations. Additionally, natural plaster can be colored to match the surrounding landscape, creating a seamless blend between the building and its surroundings.

Application Techniques

To achieve optimal results, it’s essential to apply the natural plaster in thin layers, allowing each layer to dry completely before adding the next. A general rule of thumb is to apply no more than 1/8 inch (3 mm) of plaster per application. This ensures a smooth, even finish and prevents the plaster from cracking or flaking off. When working with earthbags, it’s also crucial to ensure a secure bond between the plaster and the bags. This can be achieved by applying a thin layer of lime-based mortar to the earthbags before applying the plaster.