Protecting your lawn from a digger (excavator) comes down to choosing the right track matting and laying it correctly before the machine moves onto your property. The good news is that with proper matting, most lawns recover well — but skip this step and you could be left with deep ruts, compacted soil, and a costly repair job.
Why Track Matting Matters
Even a small 1.5-tonne mini excavator exerts significant ground pressure per square centimetre of track. On soft or wet ground — common across much of New Zealand, especially in winter or after rain — this can cause serious compaction and tearing of turf. Track matting spreads the load over a larger area, reducing ground pressure and protecting both your lawn and any underground services like irrigation lines or drainage pipes.
Types of Track Matting
There are several options available, and the right choice depends on the size of the machine, the condition of your ground, and how far it needs to travel.
1. Rubber Crane Mats (Bog Mats)
Rubber bog mats are the gold standard for heavy machines. Made from recycled rubber or composite rubber and timber, they are extremely durable and provide excellent grip. They're typically used for larger excavators (3 tonnes and above). These are usually hired rather than purchased — check with your local plant hire company.
2. Timber Bog Mats
Traditional hardwood or laminated timber bog mats (sometimes called swamp mats) are widely used in NZ for medium to large excavators. They are heavy and require machinery or multiple people to position safely. Like rubber mats, these are generally available through plant hire firms.
3. Plastic or HDPE Trackway Panels
High-density polyethylene (HDPE) ground protection panels are a popular choice for mini excavators and smaller machines. They are lightweight enough for one or two people to handle, interlock together, and can be purchased or hired. Brands vary — check with your local hire company or suppliers such as Bunnings or Mitre 10 for availability of lighter-duty options, though heavy-duty panels are typically a hire-yard item.
4. Plywood Sheets
For very small mini diggers (under 1 tonne) on reasonably firm ground, structural plywood sheets (minimum 17 mm, ideally 25 mm) can provide basic protection. This is a budget option and not suitable for wet or soft conditions, or for machines over about 1.5 tonnes. Use exterior-grade ply and overlap sheets by at least 150 mm.
5. Geotextile Fabric
Geotextile matting alone is not sufficient to protect a lawn from tracked machinery, but it can be used underneath timber or HDPE panels on very soft ground to prevent panels sinking and to protect the turf layer.
Choosing the Right Mat for Your Machine
| Machine Size | Recommended Matting |
|---|---|
| Under 1 tonne (micro digger) | 25 mm plywood or light HDPE panels |
| 1–3 tonnes (mini excavator) | HDPE ground protection panels or timber mats |
| 3–8 tonnes | Timber bog mats or heavy rubber mats |
| 8 tonnes+ | Heavy rubber/composite bog mats — specialist hire required |
Always confirm the machine's operating weight with your excavator operator before selecting matting.
How to Lay Track Matting Correctly
- Plan the route before the machine arrives. Identify the shortest, firmest path to the work area.
- Check for underground services — water, gas, electrical, and drainage lines. Call Dial Before You Dig (0800 248 344) or check your local council records. Matting reduces but does not eliminate the risk of damage to shallow services.
- Lay mats end to end with a slight overlap (at least 150–200 mm) so the tracks transition smoothly without dropping between panels.
- On slopes, ensure mats are secured or pinned where possible to prevent sliding.
- Remove mats promptly after work is complete. Leaving them in place for extended periods can kill grass underneath through lack of light.
- After removal, lightly aerate and top-dress any compacted areas with a quality lawn mix to aid recovery.
Ground Conditions and Timing
New Zealand's variable climate means ground conditions change quickly. Avoid scheduling excavator work on your lawn during or immediately after heavy rain. If your soil is clay-heavy (common in many parts of Auckland, Waikato, and Manawatū), it will be far more susceptible to compaction and rutting. Sandy or free-draining soils are more forgiving. For guidance on soil health and compaction, BRANZ publishes useful technical information on ground conditions and construction impacts.
Protecting Underground Services
Before any excavation work begins, make sure you understand your obligations under the MBIE Building Performance guidelines and your local council's requirements. Some excavation work requires a building consent — always check with your council first, as Schedule 1 exemptions have specific conditions and vary by situation.
When to Call a Professional
If you're hiring an excavator and operating it yourself, track matting is your responsibility to arrange. However, if you're engaging a professional excavator operator or contractor, discuss matting requirements with them upfront — many operators carry their own matting or can arrange hire as part of the job.
For any work near gas lines, electrical cables, or water mains, a licensed professional must be involved. Electrical work is restricted under the Electrical Workers Registration Board (EWRB), and plumbing and drainlaying is restricted under the Plumbers, Gasfitters and Drainlayers Board (PGDB).
If you need a qualified, experienced excavator operator in your area, you can find local professionals on tradedirectory.co.nz.
Sources & Further Reading
- MBIE Building Performance – Building Consent information
- BRANZ – Technical guidance for construction and ground conditions
- WorkSafe NZ – Safe use of plant and machinery
- Bunnings NZ – Ground protection and site supplies
- Mitre 10 NZ – Building and site materials
- Licensed Building Practitioners – Finding licensed tradespeople
Licensed Building Practitioner (LBP)
