Overview
MB Trees (East Anglia) Ltd carried out a PiCUS Sonic Tomograph test on a mature Sycamore tree located on The Hambros, Thurston. Commissioned by Mid Suffolk District Council, the test aimed to assess the structural integrity of a multi-stemmed union near the tree’s base.
Tree and Site Characteristics
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Species: Sycamore
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Height: Approximately 13 metres
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Crown Spread: 10 metres
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Inspection Height: 55 cm above ground
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Location Context: Situated on a grassed verge at the edge of a small housing estate. The tree is adjacent to a recently reduced Lombardy Poplar. Although no footpaths run directly beneath the canopy, the open setting is used frequently by residents.
Condition Assessment
The Sycamore tree appeared healthy at the time of inspection. The crown structure was visually sound, with no significant deadwood observed, despite the inspection occurring prior to full leaf development.
A notable structural feature was the tree’s multi-stemmed form, with several stems arising from a shared base around 70 cm above ground level. This type of union is known to present a potential structural weakness, prompting the need for PiCUS testing.
The multi-stemmed Sycamore tree at The Hambros, Thurston, prior to PiCUS testing.
PiCUS Testing Details
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Test Level: 55 cm above ground
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Purpose: To assess the internal wood condition at the multi-stemmed union.
The PiCUS test showed a solid and uniform wood density across the scanned cross-section. No signs of internal decay or structural defect were detected.
Sonic tomograph image of a Sycamore tree stem showing solid wood throughout.
Testing Process
The test involved placing multiple sensors around the tree’s circumference just below the union point. These sensors transmitted sound waves to assess internal wood density, providing a visual map of the tree’s internal structure.
Close-up of a sensor being installed for the PiCUS test.
Analysis and Recommendations
The area of concern—where the stems emerge from a shared base—showed no signs of decay or internal defects. As a result, no immediate remedial action is required. However, because of the inherent risks associated with multi-stemmed trees, we recommend:
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Routine monitoring as part of scheduled tree inspections
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Reassessment using PiCUS in two years or after extreme weather conditions
Legal Considerations
As the tree is under local authority ownership and located in a public space, any future works should consider local Tree Preservation Orders or conservation area restrictions. Additionally, it is advised to inform local residents in advance of any planned maintenance.
Conclusion
The PiCUS Sonic Tomograph test confirmed that the structural condition of the Sycamore is currently sound. This evidence-based approach enables appropriate risk management and ensures the long-term safety and health of the tree within its community setting.
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