Random Rubble

Uncoursed

Stones as acquired directly from the quarry are used, and are only hammer dressed on the face and sides so in which they could be bedded properly along with the adjacent stones (Figure).

                                   Figure : Random Rubble Uncoursed Masonry

Generally, the size of a stone used is such in which it could be lifted and placed manually. The length of the stone should not exceed three times the height and the breadth on the base should not be greater than three- fourth the thickness of the wall and not less than 15 cm.

The wall shall be taken up truly plumb. The stone work might be brought to course at the plinth, window sill and roof levels. The face stones shall extend and bond well into the backing. Work should be carried out in such a manner in which the joints are staggered. The face joints should not be more than 20 mm thick. Bond or by stones running right through the thickness of the wall shall be given at the rate of one for every 0.5 m² of the wall area in sequence to tie the faces and strengthen the work. If the walls are thicker than 60 cms, alternatively of giving a single by stone, two stones one from each face - overlapping through at least 15 cm could be provided. The quoins or corner stones should be selected stones, hammer dressed or chisel dressed and laid as headers and stretchers alternately.