Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. clay
8. [clay by product]

Anotations

Scope note:

Building material comprising a mixture of straw, gravel, and unburnt clay, especially used in the construction of walls, known as cob walls. Cob construction is distinguished by placing soft adobe in layers, rather than by making individual dried bricks or using a form.