Blacktown covers a huge spread of postwar brick, fibro and project homes on the western Cumberland Plain, where reactive clay soils dominate. Clay swells and shrinks with Sydney's wet and dry cycles, cracking slabs and footings and breaking down damp-proof courses, while holding water against the base of the walls. Rising damp and slab-edge moisture follow.
The cause is usually a failed course or a cracked slab edge on moving clay. We diagnose which, then treat with DPC injection, slab-edge work or drainage and a breathable, salt-resistant render so the repair holds.
Blacktown's vast spread of brick and slab homes sits on reactive clay across western Sydney. The strong wet-dry swing makes the clay move, cracking footings and slab edges and breaking down damp-proof courses, so moisture rises through older walls and pushes in at slab edges in newer ones, leaving salts and blown plaster.
Blacktown's flat clay plains hold water under the floor. We install underfloor ventilation to move the damp air out.
Reactive clay breaks down the damp course in older brick homes. Our rising damp repair injects a new DPC.
We re-coat with breathable replastering that resists salt.
Our mould treatment removes growth and resolves the moisture source.
We waterproof wet areas and below-ground walls to stop ingress.
Get a free damp assessment with a fixed-price plan.
Blacktown's postwar and project homes sit on reactive Cumberland Plain clay that swells and shrinks, cracking slabs and footings and breaking down damp-proof courses. The clay holds water against the walls, so rising damp is common in Mount Druitt, Quakers Hill and Seven Hills.
All of them — including Blacktown, Mount Druitt, Quakers Hill, Seven Hills, Doonside, Riverstone, Glenwood, Kings Langley, Plumpton, Rooty Hill. If your suburb is not listed, call us; we cover the whole area.
It is a major factor. Reactive clay moves a lot between wet and dry spells, cracking footings and slab edges and letting moisture into the walls, while holding water against the base of the house. We assess slab edges and drainage as part of the fix.