A major cause of foundation movement is when moisture reacts with the clay around your existing footings. It can also cause movement to any slabs or paths that are laid around the perimeter of your home. The process of using a moisture barrier is predominately aimed at remedial works for the distress caused by this moisture.



The process involves digging a trench to a depth anywhere between 600mm to 2 metres, depending on your engineer specifications, and is normally 200mm wide. Once the trench is dug layers of Micron PVC are placed down the inside of the trench on the side closest to your dwelling. This Micron PVC also covers the ground between the trench and your dwelling allowing you to replace any slab or concrete path that has been effected by movement.

Once the Micron PVC is in place the trench is filled with concrete. Your engineer will specify that a slab is to be laid next to your dwelling that becomes the moisture barrier. This slab along with the micron PVC prevents any moisture from seeping into your existing footings which may cause movement.