Subsidence Investigation

Subsidence investigation

Subsidence damage is common in times of drought due primarily to shrinkage in clay and other underlying materials.  Typical damage is localised settlement around property resulting in cracking to walls, failed drainage and in severe cases structural failure.

Clays are susceptible to swelling and shrinkage as natural moisture content varies due to patterns in rainfall and the effects of trees. Man made factors including failed drainage can also contribute to the cause of subsidence.

Our team of experienced engineers and technicians understand and are sympathetic to the needs of the property owner and insurance providers, delivering a comprehensive professional service to desired timeframes both on site and within our reporting teams.  We ensure our site presence minimises disturbance to the property owners, leaving the site clean and tidy following our exploratory investigations.

Nicholls Colton undertakes a comprehensive range of on-site and UKAS Accredited*laboratory investigations and tests to assess the damage to buildings and provide detailed a single comprehensive survey report.  Our services include:

  • trial pits externally and internally to examine the structure’s foundations
  • boreholes, window sampling and dynamic probing – click here
  • handheld sampling by auger and hand-held window sample
  • coal and shallow mine investigations
  • CCTV survey of existing drainage – click here
  • clearance of blocked drains – click here
  • repair due subsidence damage – click here
  • desk study reports detailing historical land use
  • hydraulic testing of drainage
  • a structural survey  including crack survey and monitoring of buildings – click here
  • laboratory testing of soils in accordance with BS 1377: 1990 and BRE information Paper: IP 4/93: 1993 – click here
  • in-situ testing for cohesive materials including handheld Shear Vane and Mackintosh Probe
  • tree root identification
  • Ground heave assessment in general accordance with BRE Digest 412: 1996 Desiccation in Clay Soils
  • Calculation of equilibrium Suction Values