Will screw piles move if soil heave is an issue?
Answer: Expansive (and contracting) soils present no problem for screw piles. Assuming the helices on the pile are installed to a depth where soil heave is not expected, upper soil layers are free to expand and contract without moving the pile or affecting the stability of the superstructure. As the pile shaft is so slender, soil simply moves past it uninhibited i.e. with negligible adverse skin friction.