In Stones of irregular sizes and shapes are used in this type of rubble masonry. The stones are arranged to give a good shape. It should be noted that making masonry structurally sound requires more skill. If the face stones are chisel dressed and the mortar joints are not more than 6 mm thick, it is known as Irregular Rubble Masonry I sequence. If the face stones are hammered and the mortar joints are not more than 12 mm thick, it is known as Irregular Rubble Masonry II configuration. This type of masonry is used for the construction of residential buildings.
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