What is subsidence and how is it caused?
-Water leaks into the ground from a broken pipe or sewer and washes away the soil supporting the foundations
-Large trees in close proximety to the foundation of a house can cause unwanted movement in the soil around and under the house.
-Insufficient foundation design leading to unwanted structural movement
-Some soils are prone to shrinkage when the moisture content is lowered by drying out etc. Seasonal changes in the weather can be a significant factor in this instance