All brick and block walls should be built to a recognized bond. On external walls built in facing brick or selected commons the evenness of the bond is essential for appearances sake. (On walls that have a rendered finish, the neatness of the bonding is not so essential but the basics of bonding must be adhered to for stability.)
EXTERNAL WALLS GENERALLY
Nowadays, most external walls to modern domestic properties built in England and Wales are of cavity wall construction. Although there had been experimentation with cavity construction during the nineteenth century, cavity walls became more common at the beginning of the twentieth century in an attempt to overcome one of the major problems being experienced with solid walls, namely damp penetration.