Cracked concrete, lifted pavers, and buckled asphalt caused by tree roots are among the most common property issues in Australia. As roots expand beneath hard surfaces, they generate upward pressure that makes driveways, footpaths, and patios uneven and unsafe. Here is what you can do about it.
Why Tree Roots Lift Hard Surfaces
Tree roots naturally grow in the upper soil layers where oxygen and moisture are concentrated. When a root meets a hard surface, it continues expanding beneath, gradually pushing it upward. Species with vigorous, shallow root systems are particularly problematic, including figs, coral trees, poplars, and some eucalyptus varieties.
The severity depends on the tree species, its proximity to the surface, the type of paving material, and how much the root has developed. Concrete is rigid and cracks, while pavers can be individually lifted, and asphalt tends to bulge and crack along the root path.
Assessing the Damage
Before deciding on a solution, assess the full extent of the problem:
- Is it a trip hazard? – Raised sections over 10 to 15 mm can cause falls, creating a liability risk.
- How many roots are involved? – A single surface root is easier to manage than a network of roots.
- Is the tree healthy and structurally sound? – This affects whether the tree is worth preserving.
- Is the damage ongoing? – Active root growth means repairs will only be temporary unless the root issue is addressed.
Solutions for Root-Damaged Driveways and Paths
Root Shaving or Pruning
For minor lifting caused by one or two surface roots, an arborist can shave down or prune the offending roots and the surface can be relaid. However, this approach has limitations — removing too much root material from one side of the tree can compromise its stability, and cut roots often regrow. A tree root removal professional can advise on how much root can be safely cut without risking the tree.
Bridging Over Roots
Rather than cutting roots, another option is to bridge over them by raising the path or driveway section to accommodate the root. This is often the best solution when the tree is valuable and healthy, and the root cannot be safely cut.
Root Barriers
Installing a root barrier between the tree and the hardscape can redirect future root growth downward and away from the surface. This works best as a preventive measure or when combined with root pruning and surface repair. For detailed guidance, see our tree root barrier guide.
Surface Material Changes
Replacing rigid concrete with flexible materials like permeable pavers, decomposed granite, or rubber surfacing can accommodate minor root movement without cracking or creating trip hazards. This is particularly practical for garden paths and secondary walkways.
Tree Removal
When root damage is extensive, the tree is in poor health, or repairs would be prohibitively expensive and temporary, tree removal may be the most practical long-term solution. This is especially true when the same tree is also affecting nearby building foundations or underground pipes.
Council and Legal Considerations
If the tree causing damage is a council street tree, report the issue to your local council. In most cases, the council is responsible for managing their trees and repairing damage caused by council-owned tree roots on public infrastructure. For trees on your property, check whether a permit is required before removal.
Dealing with root damage to your driveway or paths requires a balanced approach between preserving trees and maintaining safe, functional surfaces. Connect with a qualified arborist near you to assess your situation and find the right solution for your property.