Quick Answer
Mix cob in small batches, ideally 10-20 pounds, to maintain workability, and avoid overmixing, which can lead to a dense, brittle final product. Work with a mix of 1 part sand, 1 part clay, and 1.5 parts water by volume in wet conditions. A higher water content may be necessary, but be cautious of creating a too-wet mix.
Preparing the Working Environment
Mixing cob in wet conditions requires careful planning to maintain a stable work environment. Clear the area of any debris or obstacles, and lay down a durable, water-resistant surface, such as a tarp or plywood. Ensure adequate ventilation to prevent moisture buildup and reduce the risk of mold growth.
Mixing Techniques
To mix cob effectively in wet conditions, start by adding water to the dry components, then gradually incorporate the mix into smaller batches. Use a sturdy, long-handled mixing tool, like a garden fork or a broad, flat shovel, to mix the ingredients in a gentle, sweeping motion. Mix for 2-3 minutes, or until the desired consistency is achieved, stopping periodically to inspect the mix for workability.
Managing Workability
Monitor the mix’s workability by performing a simple “squeeze test”: shape a small amount of the mix into a ball and squeeze it gently. If the mix holds its shape but returns to its original form, it is ready to use. If it crumbles or falls apart, add more water and mix again. Be cautious of adding too much water, as this can lead to a weak, prone-to-deterioration final product.
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