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Understanding Investigations of Damage: Geology, Roots, and Crack Patterns

This document outlines various types of investigations conducted by Dr. Martin Dobson to assess property damage. Key areas of focus include the site geology, detailed analysis of crack patterns, and the timeline for damage development, particularly during the autumn surge. Additional investigations involve evaluating tree and shrub growth rates and identifying roots using DNA testing. The report also discusses the excavation of trial pits to measure foundation depth and conducting drain surveys using CCTV. Each investigation provides critical insights for accurate interpretation of damage causes.

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Understanding Investigations of Damage: Geology, Roots, and Crack Patterns

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  1. Types of investigation and their interpretation Part 1 Dr Martin Dobson

  2. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  3. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  4. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  5. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  6. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  7. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  8. Investigations • Site geology • Crack pattern description and interpretation • Time of development of damage (autumn claims surge) • Tree/shrub information (past and present growth rate) • Root identification including DNA testing • Trial pits (foundation depth) • Drain survey

  9. 1. Site geology http://www.bgs.ac.uk http://maps.bgs.ac.uk/geologyviewer_google/googleviewer.html Search: Geology of Britain viewer

  10. 2. Crack pattern description and interpretation

  11. Typical damage • Small, usually diagonal, cracks which suddenly appear indoors in plaster work and outside in brickwork or render. • Cracks occur at weak points, such as around doors and windows • Cracks usually become noticeable in late summer. • The cracks will normally be wider at the top. • Doors and windows may also “stick” due to the distortion of the building.

  12. Basingstoke Road, Reading

  13. 3. Timing of damage

  14. 3. Timing of damage

  15. 4. Tree/shrub information (past and present growth rate) • Measured survey • Species of tree/shrub • Water demand • Age (increment core) • Height/crown spread • History of management

  16. 5. Root identification including DNA testing

  17. 5. Root identification including DNA testing

  18. 5. Root identification including DNA testing

  19. DNA fingerprinting • Very small roots • To distinguish between trees of the same species • To distinguish trees of different clones

  20. 6. Trial pits (foundation depth)

  21. 6. Trial pits (foundation depth) 830 mm

  22. 7. Drain survey (CCTV)

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