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Cob is the name given to a mixture of clay, earth, animal manure, hair and stones. This was used in early buildings to create standing walls but it is unstable when wet and needs a semi-permeable membrane to ensure its stability. This was achieved by plastering it with lime mortar. A lime wash was then sometimes applied to complete the work and provide a light coloured finish.
Some early Listed Buildings may have cob or earthen walls and Planning Officers
sometimes require repairs to them to be carried out using original techniques
and equivalent materials. Sites dealing with special cob walling techniques
exist on the Internet but before relying on the information provided it is
wise to check with a local Planning Office or archaeology department before
repairing walls in ancient structures.
Structures of wattle and daub may also contain important archaelogical evidence
so it is best to consult with the experts before cutting out and restoring
them.
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