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Despite many advantages discussed in previous posting , the excavation of block is time consuming as it is to be done manually so that side soil is not disturbed . Also block size need to be at least 900x900 mm or higher for manual working excavating.
In case JCB is used for excavation , side shuttering / 4.5" brick wall is needed before concreting. Also in such situation side backfill around block needs compaction .
But still is an economical and faster when compared to conventional spread footing with top and bottom meshes concreting first and pedestal concreting afterwards.
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