Quick Answer
To ensure earth plaster adheres properly, prepare a clean, damp surface, and apply a thin layer of natural binding agents like clay or lime. This helps create a strong bond between the plaster and the earth walls.
Surface Preparation
For a successful earth plaster, the surface must be clean and free of debris. Use a wire brush to remove any loose material, then hose down the area with water to create a damp surface. This allows the binding agents to penetrate and adhere more effectively. Allow the surface to air dry slightly before applying the plaster.
Binding Agents and Mixing
A thin layer of natural binding agents like clay or lime is essential for a strong bond between the plaster and the earth walls. Mix these agents with the earth plaster, using a ratio of about 5-10% binding agent to 90-95% earth. Avoid over-mixing, as this can create a brittle plaster that may crack and flake off.
Application Techniques
Apply the earth plaster in thin layers, typically 1/4 inch (6 mm) thick, to prevent it from becoming too heavy and cracking. Use a trowel or sponge to create a smooth, even surface. Work from the bottom up, applying each layer in a consistent, overlapping pattern to prevent water from penetrating and causing damage.
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