Cobb walls are made from a mixture of clay, sand (coarse, fine, and silt), water, and straw, built around a wood frame. This ancient building method is widely used in regions like Central Asia, the Middle East, and Sub-Saharan Africa.
Suitable Climates: Best for temperate climates with seasonal variations and hot, dry climates. Cobb can also work in wet climates if proper measures like good drainage and breathable plasters are applied.
Temperate: Ideal for seasonal temperature changes.
Hot/Dry: Performs well in arid conditions.
Wet: Requires drainage and breathable finishes to prevent damage.
Not suited: Less effective in extreme cold or very hot climates.
Key Points:
Cobb construction is labor-intensive with a longer drying time, making it unsuitable for large or grand homes. It is not conducive to extreme climates.
Benefits: Cobb uses readily available natural materials and allows for unique, artistic home designs. Minimal skilled labor is needed, supporting DIY and community involvement. Its high thermal mass improves energy efficiency, and the lack of chemicals promotes a healthy indoor environment. The straw content provides earthquake resistance, acoustic privacy, termite resistance, and fireproof qualities.
Drawbacks: The building process is labor-intensive and slow due to long drying times. Cobb is not ideal for very large buildings and performs poorly in extreme climates.
Applications: Commonly used for walls in small to medium-sized residential buildings, especially where natural, sustainable construction is desired.

Photo from - https://dornob.com/eccentric-aesthetics-diy-eco-friendly-earthbag-homes/