What is Subsidence?

Subsidence is a term that describes the sudden sinking or gradual downward settling of the ground's surface with little or no horizontal motion. This issue predominantly affects structures by altering the ground on which they stand, leading to potential damage and stability concerns.

Common Causes of Subsidence

Subsidence can be triggered by a variety of factors:

• Soil type: Clay soils are particularly susceptible to changes in moisture levels, expanding and contracting as the water content varies.
• Tree roots: Large trees growing too close to the foundation of a building can draw moisture from the soil, causing it to shrink.
• Leaking drains: Water from leaking pipes can soften or wash away soil, which reduces its load-bearing capacity.
• Previous mining activity: Old mine workings can leave voids that collapse and result in subsidence.

Identifying Subsidence

Detecting subsidence early can mitigate much of the potential damage. Here are key indicators:

• New or widening cracks in plasterwork or external brickwork.
• Doors and windows becoming misaligned, sticking or failing to close.
• Rippling wallpaper that's not caused by dampness.

Addressing Subsidence Issues

If subsidence is suspected, a comprehensive property survey is crucial. Professional surveyors utilize precise tools and techniques to assess the extent of movement and determine the appropriate remedial action. Solutions may include:

• Underpinning the foundation to strengthen and stabilize the structure.
• Removing or pruning problem vegetation.
• Repairing or replacing damaged drains or pipework.

Proper diagnosis and timely intervention can often prevent more severe consequences and help maintain the property’s value. Consulting with a qualified building surveyor can provide guidance tailored to your specific circumstances.