As well as water interference due to factors such as burst pipes, there are also several natural causes of
• Cohesive soil shrinking and swelling – Soils such as clay and silt are particularly susceptible to causing subsidence. Changes in weather cause the cohesive soils to shrink and swell leading problems within the foundations.
• Non-cohesive soils being washed away – Soils such as sand and gravel are susceptible to being washed away by water flow.
• Movement of soil structures – A combination of soil types underneath a buildings foundations can result in movement and subsidence.
• Soil decomposition – Natural soils such as peat can decompose and cause ground movement.
• Trees and other vegetation – Roots from nearby vegetation can absorb moisture from the soil, causing it to shrink. This is more common in dryer conditions where plants expand their roots in search of water.