Quick Answer
A 2-3 inch (50-75 mm) plaster layer is a common thickness for earthbag buildings, providing a durable, weather-tight finish suitable for most climates. This thickness allows for easy finishing work, such as sanding and painting, and helps to prevent water infiltration. A thicker layer may be necessary in areas with heavy rainfall or strong winds.
Earthbag Construction Basics
When building with earthbags, it’s essential to apply a sufficient plaster layer to protect the structure from the elements. A 2-3 inch (50-75 mm) plaster layer is often considered the standard for most earthbag buildings. This thickness provides a sturdy, weather-tight finish suitable for various climates. For areas with heavy rainfall or strong winds, a thicker layer may be necessary to ensure the structure’s integrity.
Plastering Techniques
To achieve a consistent, even plaster layer, use a mix of 1 part cement to 2 parts sand, with a small amount of water added to create a workable paste. Apply the plaster using a trowel or sponge, ensuring a smooth, even finish. A key aspect of plastering earthbags is to maintain a thin layer, about 1/8 inch (3 mm) thick, over the barbed wire reinforcement. This helps prevent the plaster from bulging or cracking over time.
Plaster and Barbed Wire Integration
When integrating the plaster with the barbed wire reinforcement, use a technique called " wire wrapping." This involves wrapping the barbed wire with a thin layer of plaster, creating a secure bond between the two. To ensure a strong connection, use a consistent, even layer of plaster, about 1/8 inch (3 mm) thick, over the barbed wire. This will help prevent the plaster from cracking or pulling away from the wire over time.
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