BOULDER SOLING IN FOUNDATION

Building Construction Ideas - Topic 4

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Once the Earthwork Excavation work is completed for footing, next immediate permanent work to be done is Boulder (stone) Soling.

Fig 4.1: Boulder Soling for Isolated Footing

But before this the bed on which boulder soling is to be laid shall be cleared of all loose materials, levelled,watered and compacted and got approved by the Engineer before laying boulder soling. All soft places in the sub-grade(soil) should be excavated and filled with compaction. 

Over the prepared surface, the stone should be set as closely as possible and well packed and firmly set. The rubble stone should be of best variety of black trap/granite/basalt or other approved variety of stone. The stone should be hard, durable, free from defects and weathering and of required size. The size of the rubble stone shall not be less than the soling thickness. The stones should be of full height and should be laid so as to have their bases of the largest area resting on the sub-grade. Soling should be laid in one layer of specified thickness of soling with a tolerance of 25 mm. After packing the stones properly in position, the gaps between them should be carefully filled with quarry spoils or stone chips of larger size possible to obtain a hard, compact surface. Spreading of loose spoils or stone chips should not be done. After soling, the finished surface should be in required line & level and the surface should look neat finish.

Fig 4.2: Boulder Soling for Combined Footing

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