Your engineering report will state that these must be done, unfortunately this can be overlooked for many years, resulting in areas of concern.
This week I looked at a house that was built 10 years ago and still had incomplete external pathway areas.
The builders timber debris was still lying around in the mud, resulting in termite activity.
The mud had breached the concrete slab damp proof course and encapsulated the brick expansion joints and the lower course of the brickwork. This had resulted in moisture transfer on to the house brickwork, as well as breaching the termite control systems done when the house was built.
Moisture salting can be noticed on the brick and mortar face.
Termite attacked timber was located right next to this area.
Inspections are a must in all houses that you want to purchase.