Ground conditions and slabs in Leppington NSW

Leppington sits on the Cumberland Plain, where the soils weather from Wianamatta Group shale into clay rich profiles with a lighter surface over a dense clay subsoil. Those clays change volume with moisture through the seasons, and your slab is designed to be stiff enough to ride that out. That stiffness comes from beam geometry, reinforcement and cover, which is why the pre-pour stage is worth more here than the marketing suggests. We do not publish a site class for the suburb, because an AS 2870 classification belongs to your lot and your soil report.