Australia is one of the driest places on earth. If your house slab is built on highly reactive clay soil types, the expansion and contraction of the clay may cause differential settlement within the sub base region under your house slab and also contribute to large crack formations in your brick masonry walls.
If this is the case then underpinning may not be the only remedy needed. We also utilise a technique known as slurry diaphragm walling to prevent water loss through lateral hydrodisplacement. In other words, a trench is made, and filled using a suspension mixture of bentonite, clay and possibly cement if required.
The soil bentonite slurry wall inhibits water transfer and protects the sub base area underneath your house. This inhibits differential settlement and subsequent cracking there under.
If you have type 2 clayey soil under your house then the diaphragm slurry wall method maybe your best bet. Give us a call on 0499330772 or send us through an email at firstname.lastname@example.org for further information.