Raised and cracked concrete, and sewer pipes, retaining wall damage, reduced water pressure, foundation damage
- Camphor laurels are generally well anchored with large root systems. This tree is sufficiently large and vigorous to be causing such damage, but it is also far enough from the house and retaining wall that it is not necessarily the case. There are also alternative damage explanations to consider.
- Given that the onus is on the applicant to prove her case (Roberts vand Denham [2010] NSWLEC 1269 at [11]), Mr Jayne, Solicitor for the respondents, noted the applicant's claims lacked substantiating evidence.
- In Smith & Hannaford v Zhang & Zhou [2011] NSWLEC 29 at [62], Craig J said ""something more than a theoretical possibility is required in order to engage the power under the Trees (Disputes between Neighbours) Act to make an order to remedy, restrain or prevent damage".
- In Stevens v Russell [2016] NSWLEC 1233 at [40], Commissioner Fakes notes that:
"it is a common assumption that the mere presence or proximity of a tree is sufficient to conclude that the tree is the cause of the damage. It is not. It is necessary to find evidence to substantiate the assumption that the tree has caused the damage. In the case of alleged root damage, some excavation is usually required."
- Though excavation of concrete and areas of the retaining wall would be disruptive, in absence of this having occurred, there was no exposed root presence to illustrate a nexus between the tree and the damage, beyond a theoretical possibility. The respondents note that the structure of the retaining wall and nature of its foundations are unknown, and that stormwater may flow towards the wall, and thus eroded and damaged it.
- The applicant noted that her sewer pipe had been cracked about 13 years ago and that she feared further damage as a result of tree roots, but no invoices or other evidence was provided to confirm the tree as the cause of prior sewer pipe damage, and nor was concern about future damage substantiated.
- Even if damage to sewer pipes in the applicant's property had been found to engage the jurisdiction of the Trees Act, the Court considers wear and tear that is likely to have occurred over time when contemplating apportioning the costs of repairs between the parties, as some pre-existing jointing defects or other cracks are likely to have existed before the tree's roots could enter the pipe. This normally arises at junctions of pipes that were not adequately sealed upon installation, and/or where the joint sealant has deteriorated over time. Presuming the pipes were adequately installed and/ or repaired about six years ago, there is no reason to be unduly concerned about roots entering sewer pipes.
- Ms Johnson's concerns about reduced water pressure are ambiguous and, though the two appear unrelated, have been conflated with downpipe issues. Reduction of water pressure is unlikely to relate to the tree unless water supply pipes have been crushed or bent, and no evidence has been provided to support such a notion.
- Ms Johnson fears that recent internal cracks in walls and ceilings indicate that 'intrusive roots' have moved her home foundation, but she provided no evidence to support her concerns. Houses move in response to shrinking and swelling of clay soils, and the 2018 repair of the respondents' previously unregulated storm water, the vastly altered weather patterns after the drought broke in early 2020, and the surface flow of stormwater from rear downpipes close to foundations, may have individually or collectively altered moisture levels, and caused internal cracking. Given this range of possible causes, it is certainly unreasonable to link such damage to tree roots without evidence to prove a nexus.
- As a result of insufficient evidence, Ms Johnson's claims regarding damaged concrete and retaining wall, cracked sewer pipes, walls and ceilings, and reduced water pressure are set aside.