Screwpiles are, literally, screw in foundations comprising one or more helices attached to a round shaft, installed by rotary hydraulic motor.

Typical shaft sizes range from 73mm to 406mm, diameter, although sizes up to 915mm have been used. Helix sizes depend upon the shaft diameter and soil conditions, ranging from 150mm to over 1 metre.

Screwpile technology offers significant advantages over traditional piling systems: