CFA (Continuous Flight Auger) Piles are constructed by drilling a slender hole into the ground utilising a hollow auger, then pressure pumping grout or concrete through the hollow auger as it is slowly being retracted out of the ground. Reinforcing cage or centre bars can be installed immediately after the auger is fully withdrawn.

CFA Piles are suitable for most soil types, but are particularly suited to collapsible soils with high water tables. This system offers two distinct advantages: there is no need for temporary shoring, and the productivity rates are extremely high in comparison to standard bored piles in loss soil condtions.