Helical screw pile foundations offer four primary advantages over concrete slab foundations: they can be installed in a single day with no concrete pour; they require no cure time before structure erection; they work in poor bearing soils where conventional foundations struggle; and they can be removed and relocated. For a typical 2,000 square metre commercial building, this represents a programme saving of three to six weeks over conventional foundations.
A conventional concrete foundation sequence involves multiple stages that compound into significant programme exposure. Geotechnical investigation takes two to four weeks. Design of the foundation system takes one to two weeks after investigation results are received. Forming, pouring, and curing concrete takes one to three weeks depending on weather and pour schedule. The 28-day structural cure requirement before erection begins is fixed — no amount of project management can accelerate the chemistry of concrete hydration.
Any unexpected ground conditions discovered during earthworks can require redesign, adding further time. In New Zealand's geologically varied environment — coastal clays, volcanic soils, high water tables, seismically active zones — unexpected conditions are common.
The VAST Foundation Cassette System uses IncrediPile helical screw piles. A small machine screws the pile into the ground. No excavation. No concrete. No weather dependency. As the pile goes in, the installation torque is continuously monitored and logged. The torque-to-capacity relationship under NZS 3604 pile design methodology means the pile's bearing capacity is known in real time as it is installed.
For a 2,000 square metre building requiring 80 to 100 piles, a two-person crew completes installation in one to two days. The FormSteel tray deck is installed the same or following day. Structure erection begins immediately.
Every IncrediPile installation is recorded in the SIQ digital twin — pile reference, grid location, installation torque, certified capacity, installation date, and installer. This data is available for the life of the building. When a tenant requests additional load in year ten, the structural capacity at every grid point is already known.