Why Western Sydney soil movement is a first-order risk
Much of Western Sydney sits on Bringelly Shale — a highly reactive clay soil rated Class H1 or H2 under AS 2870. In dry summers these soils shrink, dropping footings by tens of millimetres; in wet winters they swell and lift. Lightly founded slabs and older strip footings can crack, tilt and distort as a result.
Our Western Sydney inspections always include an assessment of external crack patterns, articulation joints, and internal cornice separation to flag reactive-soil movement early — often before it becomes a costly rectification.














