Engineered piling
Screw pile underpinning
Where good ground is deep, excavating to it stops making sense. Screw piles, helical steel shafts installed with hydraulic torque motors: reach founding strata many metres down, and the recorded installation torque gives the engineer a live proxy for load capacity at every pile. Brackets then tie footing to pile, and the structure's load moves to steel.
Scope
What this covers
Pile layout and capacity design by the structural engineer with geotechnical input
Hydraulic installation with torque monitoring recorded per pile
Underpinning brackets connecting existing footings to the pile heads
Optional lift procedures where the design calls for partial level recovery
Installation records and certification documentation for the project file
Timing
When it's needed
Deep fill, soft alluvial profiles, and reactive clays that stay unstable well below practical dig depth all point toward piling. Screw piles also suit tight sites: the equipment is compact, spoil is minimal, and vibration is low compared with driven alternatives.
A structure showing sudden movement (new wide cracking, doors bursting their frames, walls leaning or floors dropping) should be treated as unstable until an engineer says otherwise. Keep clear of the affected section, do not excavate beside distressed footings, and seek immediate structural advice.
Quote variables
What shapes the scope
Pile depth and quantity determined by the geotechnical profile
Obstructions such as rock floaters, old footings or services along pile positions
Bracket configuration and the condition of the footing being connected
Whether relevelling is attempted or the structure is stabilised as it stands
Underpinning in NSW sits inside the residential building framework: it requires an appropriately licensed contractor, a structural design from a practising engineer, and geotechnical investigation proportionate to the site. Depending on scale and context it may need approval through a certifier or council. Verify licence, insurance details and the engineer's registration independently before work begins.
Underpinning systems
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