One reason for stumps to move is when there is excessive rain fall and inadequate drainage. Rain can run under the property, the soil at the base of the stumps washes away and causes the stumps to drop or move from their original position, which can cause structural building cracks, floor movement and eroded or rust floor lintels.

Another reason is because the property was built on reactive soils, such as clay, which means in wet weather the soil will rise with the added moisture and when the moisture evaporates in warm or hot weather it contracts causing the building to drop.