Resistance Drill Testing

Internal decay in trees and palms is common, and it can increase the chance of failure. This can happen as a result of disease, fungal rot, or even animals, resulting in damage or loss of woody tissue that reduces the tree's cross-sectional strength. Decay does not necessarily indicate that a tree will fail; rather, the manner in which it breaks is determined by a variety of factors. As a result, it's critical to consult with knowledgeable and qualified arborists to ensure that human life, infrastructure, and the surrounding environment are protected against excessive risk.

There are many ways that an arborist can assess a tree. One common practice is to complete a tree survey or conduct a risk assessment on each individual tree to identify potential risks or diagnose any existing issues or diseases that may result in an increased likelihood of failure. The International Society of Arboriculture classifies this as a ‘Level 2: Basic risk assessment.'

However, in some instances, visual assessments have limitations. Technical instruments are therefore used to detect, quantify, and map internal decay. Common practice to detect decay and cavities in trees and timber is through Resistance Drilling. This is known as a ‘Level 3: Advanced Assessment.’

We use specialised resistance drilling equipment known as an IML RESI PD-400. The IML-RESI PowerDrill ® PD-400 is an electronic resistance drill that drives a small diameter (3mm) spade bit to a maximum depth of 400mm into a tree. As the bit penetrates, the drill’s resistance is simultaneously plotted as a graphic profile which is used to determine the internal strength of the wood. From this, we can create a "map" of internal decay—a visual representation of what is occurring inside the tree. This information is overlaid with specific site and tree characteristics so we can provide an educated assessment of the likelihood of failure at the test location. Each cross-section that is tested is risk assessed using the internationally recognised tree risk assessment method developed by the International Society of Arboriculture known as TRAQ.

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Canopy Consulting
Macquarie Park NSW 2113
1300 122 667
(1300 1CANOPY)

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