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

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

2 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

3 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

4 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

5 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

6 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

7 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

8 Investigations 1.Site geology 2.Crack pattern description and interpretation 3.Time of development of damage (autumn claims surge) 4.Tree/shrub information (past and present growth rate) 5.Root identification including DNA testing 6.Trial pits (foundation depth) 7.Drain survey

9 1. Site geology

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14 2. Crack pattern description and interpretation

15 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.

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17 Basingstoke Road, Reading

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24 3. Timing of damage

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26 4. Tree/shrub information (past and present growth rate) 1.Measured survey 2.Species of tree/shrub 3.Water demand 4.Age (increment core) 5.Height/crown spread 6.History of management

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28 5. Root identification including DNA testing

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31 DNA fingerprinting  Very small roots  To distinguish between trees of the same species  To distinguish trees of different clones

32 6. Trial pits (foundation depth)

33 830 mm

34 7. Drain survey (CCTV)


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