Subsidence Investigation Services
Complete Investigation, Monitoring and Reporting for Domestic and Commercial Projects
With over 20 years of experience in this sector, Chelmer provide a comprehensive subsidence investigation service for both domestic and commercial properties. Working closely with loss adjusters, insurers and engineers, Chelmer deliver a fully integrated approach that combines site investigation, testing, monitoring and reporting into a single coordinated service.
Subsidence investigations require a detailed understanding of ground conditions, structural behaviour and potential external influences. Chelmer’s “one-stop” service is designed to ensure that all relevant information is obtained efficiently, helping to simplify what can often be a complex and sensitive process for all parties involved.
Recognising that subsidence claims can be disruptive, Chelmer’s site teams are fully trained, well presented and experienced in working within occupied environments. All operatives are equipped to carry out investigations safely and with consideration for the property and its occupants, ensuring that works are completed with minimal disruption wherever possible.
Comprehensive Investigation Services
Chelmer offer a full range of investigation techniques as part of their subsidence service, allowing a detailed assessment of both the structure and the ground beneath it. These methods are often used in combination to provide a complete understanding of the cause and extent of movement.
Trial pits are commonly used to expose existing foundations, allowing inspection of their depth, construction and condition. Detailed records, including photographs and measured sections, are taken during excavation and incorporated into the final report. Where required, extended trial pits can be carried out to expose structural elements such as underpinning, ground beams, pads or pile caps.
Boreholes are typically undertaken to depths of between 3 and 6 metres using hand augering techniques, although mechanical methods can be used where ground conditions require. These boreholes allow soil conditions to be assessed at depth and provide access for further testing and monitoring installations.
In-situ testing may also be carried out within trial pits or boreholes, using methods such as shear vane testing or Mackintosh probing to assess soil strength and consistency. These tests provide valuable information when determining the behaviour of the ground and its influence on structural movement.
Soil Testing and Root Identification
Soil samples obtained during the investigation are tested in Chelmer’s UKAS accredited laboratory, ensuring accurate and reliable results. A full range of testing can be undertaken, including moisture content, Atterberg limits, soil suction and particle size distribution, all of which contribute to understanding ground behaviour.
Where vegetation is present, root identification can play a critical role in determining the cause of subsidence. Root samples may be collected and analysed to identify the species responsible, particularly in cases where clay soils are affected by root-induced desiccation. This information is often essential in identifying the source of the problem and determining appropriate remedial measures.
Drainage Investigation and Assessment
Drainage systems can both contribute to and be affected by subsidence. Chelmer carry out detailed drainage investigations using CCTV survey equipment, allowing the condition of underground drainage systems to be assessed accurately. Hydraulic testing can also be undertaken to determine whether sections of drainage are leaking.
In addition to standard surveys, Chelmer are able to investigate complex or inaccessible systems, including “blind” drainage where no direct access is available. Where defects are identified, recommendations can be made and quotations provided for repair works, helping to streamline the overall process.
Leak detection of water supply pipes and other services can also be undertaken as part of the investigation, providing further insight into potential causes of ground movement.
Monitoring and Movement Assessment
Monitoring forms a key part of many subsidence investigations, allowing movement to be measured over time. Chelmer offer a range of monitoring techniques, including crack monitoring, level monitoring and verticality surveys.
Crack monitoring installations can be set up during the initial investigation, with readings taken at specified intervals using digital equipment. Level monitoring is carried out using datum points installed within stable ground, allowing precise measurement of vertical movement in accordance with established guidance.
Additional methods such as floor distortion surveys and verticality surveys can also be undertaken to assess how a structure is moving. These techniques provide a detailed understanding of the pattern and extent of movement, supporting accurate analysis and reporting.
Integrated Reporting and Recommendations
All aspects of the investigation are brought together into a single, comprehensive report prepared by Chelmer’s consultancy team. This report includes findings from site investigations, laboratory testing and monitoring, along with a clear interpretation of the data.
Recommendations for remedial measures are also provided where appropriate, helping clients and their professional teams to determine the next steps. By delivering a single, easy to understand report, Chelmer simplify the process and ensure that all relevant information is presented clearly.
A Complete and Coordinated Service
Chelmer’s subsidence service is designed to provide a complete solution, combining investigation, testing, monitoring and reporting within one organisation. This integrated approach reduces the need for multiple contractors, improves communication and ensures that projects are delivered efficiently.
With extensive experience in the sector and a strong focus on quality and service, Chelmer continue to support clients across the UK with reliable and thorough subsidence investigations. Their ability to deliver a coordinated and technically robust service ensures that each project is handled with the care and attention it requires.