In this type of rubble masonry, the stones vary in height from 50 mm to 20 cm. Stones are stockpiled before work begins. Masonry is then done in courses in such a way that the stones in a particular course are of equal height. This type of masonry is used for the construction of public buildings and residential buildings. Rubble masonry is further divided into three types.
- Coursed rubble masonry I sort: In this type, stones of the same height are used and the courses are of the same heights. The face stones are dressed by means of a hammer and the brushings do not project by more than 40 mm. The thickness of the mortar joint does not exceed 10 mm (Figure 15.1).
- Coursed rubble masonry II sort: The stones to be used are of different heights. The courses need not be of equal heights. Only two stones are to be used to make up the height of one course. The thickness of the mortar joint is 12 mm
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