Slab Rocking is concrete slabs constructed on unbound sub-bases can cause ‘steps’ at joints, the main cause being movement of the sub-base. As heavy vehicles such as forklifts travel over a joint, the slab on the approach side is deflected downward. When the wheel leaves, it quickly deflects upwards creating a gap of low pressure between the slab and the sub-base drawing minute amounts of material from beneath the departure slab to the other side of the joint.

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There is a common misconception that the cause of foundation settlement is due to the design (or under-design) of the structure itself. Instead, the real culprit of damage can be attributed to changes in soils beneath and surrounding the foundation and structure. Here is a list of the most common changes that occur in soil which cause foundation settlement.

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Surprisingly, foundation settlement problems are very common. Why? Well, mainly because buildings are heavy and many types of soils beneath their foundations have poor load-bearing capability.

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