Random Rubble Masonry is slightly superior to uncoursed rubble masonry. In this form the stones used in the work are hammer or chisel-dressed. The stones are not suitably shaped or finished and as such the elevation of this type of stone masonry shows irregular shaped stones with non-uniform joints. In a good work the face stones are of uniform colour and approximately equal in size. The height of stones should be greater than their breadth or length of tail into the work.

At least one fourth of the face stone should tail back into the heading for ensuring proper strength to the work. The quoins and the through stones are provided in a similar manner as described earlier. The thickness of joints should not exceed 13 mm.