The rotary bored piling method refers to the installation of piles using drilling techniques. Bored piles are drilled using buckets and/or augers inside a temporary casing, driven in place by means of vibratory hammers or through twisting in place using the drilling rig itself.  The temporary casing maintains the upper soil layers stable especially in water bearing strata.  Depending on the design toe level of the pile, drilling underneath the casing may take place in stable soils such as soft rock or cohesive soils.

In unstable soil strata beneath the toe level of the top casing, the use of bentonite or polymer fluid assists in stabilising the bore especially in deep and large diameter piles.  It also allows the perfect insertion of heavily reinforced steel cages.  NSCC possesses the most modern fleet of large diameter heavy-duty rotary piling rigs, that are capable of drilling to depths exceeding 75 metres.