Need a tree assessed? Contact us to arrange a Resistograph inspection.
What Is Resistograph Testing?
A Resistograph is specialist diagnostic equipment used to investigate the internal condition of a tree. This can be particularly useful when there are concerns about a mature or potentially hazardous tree but the extent of internal defects cannot be established through external inspection alone.
Detailed Investigation of Tree Health and Structure
A tree can sometimes appear healthy externally while having significant internal defects. Resistograph testing allows us to investigate specific areas of concern and obtain a resistance profile through the wood.
Resistograph Testing for High-Risk Trees
Trees located close to homes, roads, footpaths, car parks and other areas where failure could have serious consequences may require more detailed investigation when defects are suspected.
Why Choose Resistograph Testing?
Internal defects aren't always visible from the outside. Specialist testing can provide additional information about the internal structure of the tree.
Testing can help provide objective diagnostic information when deciding how a tree should be managed.
Where retaining an important mature tree is desirable, detailed investigation may help establish whether defects are localised or more extensive.
Resistograph testing can be particularly valuable where the condition of a tree is uncertain or where there are significant concerns about structural integrity.
How Does Resistograph Testing Work?
1. Initial Assessment
We first inspect the tree and identify any visible defects or areas that may require further investigation.
2. Testing Locations
Suitable testing points are selected based on the tree's condition, structure and the specific concern being investigated.
3. Resistograph Measurement
A fine drill is used to measure resistance through the wood, producing a profile that can highlight changes in wood density.
4. Results Are Assessed
The recorded results are interpreted alongside the visual condition of the tree and other relevant factors.
5. Recommendations
Where appropriate, the findings can help inform recommendations for further monitoring, remedial work, further investigation or tree removal.
Frequently asked questions
What can Resistograph testing detect?
Resistograph testing can identify changes in resistance through the wood that may be associated with areas of decay, cavities or changes in wood density. The results should be interpreted alongside a visual inspection and other relevant information rather than considered in isolation.
Does Resistograph testing damage the tree?
The equipment uses a very fine drill to take a resistance measurement through the wood. This creates a small drilling point, but the procedure is minimally invasive compared with more extensive investigative techniques. The suitability of testing should be assessed on an individual tree basis.
Does Resistograph testing mean a tree needs to be removed?
No. The purpose of testing is to obtain additional information about the tree's internal condition. The results may support a range of management options, including retention and monitoring, remedial work or further investigation. Tree removal is not an automatic outcome of a Resistograph test.