Cob Building Technique
Cob is a traditional building technique that uses a mixture of clay subsoil, sand, and fiber material (usually straw) to create solid monolithic walls and structures.
Fascinating Properties
Cob captivates with its extraordinary versatility in design. The walls can be shaped into almost any desired form, creating unique, organic designs. Particularly impressive is the ability to harmoniously integrate unusual window and door shapes. But Cob isn't just aesthetically pleasing: the walls provide excellent heat storage and naturally regulate humidity, contributing to an exceptionally pleasant and healthy indoor climate. Since the materials are usually locally available, Cob is also a sustainable and durable building method.
A look into history
Cob is one of humanity's oldest building techniques. Impressive historical structures can be found from Central Asia through the Middle East to Africa. Cob has a particularly rich tradition in Great Britain, where it has shaped the country's architecture since the 15th century. A living testimony to this history can be found in Devon, where 20,000 Cob houses still stand today. These buildings impressively demonstrate their longevity - many easily survive 100 years without major repairs. British settlers brought the technique to New Zealand, Australia, and North America, where the houses continue to withstand wind, weather, and even earthquakes to this day.
The Renaissance of Cob
After declining during industrialization, Cob is experiencing a remarkable revival today. In the USA, particularly in Oregon, a modern interpretation developed: "Oregon Cob". This evolution demonstrates how traditional building techniques can be successfully adapted for the present.
The Material
The art of Cob building lies in the perfect mixture of its components. The clay subsoil acts as a natural binder, while sand provides the necessary stability. Straw reinforces the construction and adds additional strength. Water is added to make the mass optimally moldable and workable.
Cob Variants
Freehand Cob
In this traditional method, the cob mixture is shaped directly by hand. Layer by layer, organic walls emerge that can be personalized with individual details such as niches or curved window sills. This technique is particularly suitable for creative projects where organic forms and individual design are the main focus.
Shuttered Cob
In this variant, the cob mixture is layered and compacted into formwork. This technique enables precise, uniform walls without extensive finishing work. The method is particularly suitable for projects where straight walls are desired or where efficient construction is a priority.