Ground conditions and slabs in Austral NSW
Austral sits on the Cumberland Plain, where the soils weather from Wianamatta Group shale into clay rich profiles with a light surface layer over a dense clay subsoil. Those clays move with moisture, and the slab on your lot is designed to be stiff enough to ride that movement out. Which is the entire reason the pre-pour stage matters more here than the marketing suggests: the stiffness comes from beam depth, steel and cover, and our Austral findings include cover short of minimum and beam reinforcement not as detailed. We do not publish a site class for the suburb, because AS 2870 classification belongs to your lot and your soil report.
Fully licensed & accredited
-
NSW Fair Trading -
Australian Society of Building Consultants -
Strata Community Association -
Building Dispute Practitioners Society
The suburb lies on the Cumberland Plain over Wianamatta Group shale.
Across the old Austral market garden blocks, a thin light topsoil usually gives way to heavy clay beneath.
That clay swells after wet months and shrinks back in dry ones.
How well a slab resists that movement depends on its edge beams, the steel placed in it and the concrete cover over that steel.
AS 2870 site class comes from your lot's soil report, not from the suburb.
More about Austral
- Building a new home in Austral NSW
- Buying a home in Austral NSW
- Growth and development in Austral NSW
- Certifiers, council and building disputes in Austral NSW
- Weep holes and ground clearance in Austral NSW
- Common building defects in Austral NSW
- Wet area waterproofing in Austral NSW
Written by our local inspection team from work carried out in Austral. Licensed building practitioners.
