SFA Piling, or Sectional Flight Auger piling, is an innovative auger-bored replacement pile solution engineered for challenging construction environments. This method provides the ability to install robust foundations in sites characterised by low headroom or extremely restricted access, offering a similar, yet highly adaptable, solution to CFA piling. The core distinction lies in the auger itself; for SFA Piling, the auger is composed of shorter, interconnected sections of hollow stem continuous flight auger.

SFA Piles begins with the insertion of this sectional hollow-stemmed auger into the ground. As the auger rotates and penetrates, it clears the borehole by bringing spoil to the surface, ensuring a clean and precise bore tailored to the project. Upon reaching the depth, concrete or grout is then pumped through the hollow stem of the auger as it is steadily withdrawn. A critical aspect of this technique is maintaining a continuous head of concrete or grout during auger extraction, which prevents the formation of voids and ensures a solid, stable pile. Immediately after the auger is withdrawn, the reinforcement cage is inserted into the fresh concrete, enhancing the structural integrity and load-bearing capacity of the pile.