As communities increasingly seek nature-based public spaces, designers and councils are balancing the desire for natural materiality with concerns around durability, maintenance and asset longevity. More often than not, the only data available is the capital expenditure: what it costs to supply and install the equipment.
But the purchase price of a piece of equipment is just one consideration. Asset performance plays out over years and decades. When the full cost of ownership is considered — inspection obligations, maintenance, remediation, early replacement and the liability exposure that comes with a deteriorating public asset — the initial price difference between a timber product manufactured with retained sapwood and one manufactured from heartwood only
often represents only a small fraction of the asset’s total lifecycle cost.
Your Legal Obligations as an Asset Owner
Before examining the numbers, it is worth understanding the framework within which any
playground asset operates.
Under Australian Standard AS 4685:2021, asset owners (e.g. councils, schools, developers)
are legally required to undertake routine visual inspections, regular operational inspections and comprehensive annual inspections of all playground equipment. Records of every inspection, finding and rectification must be maintained as part of a Safety Management System that can be audited.
This obligation does not diminish because an asset is deteriorating. It intensifies. A playground element that has been inspected, found to be in poor condition and not remediated becomes a documented liability. The inspection record becomes evidence.
Asset owners are also required to maintain manufacturer warranties; and warranty protection
requires documented maintenance.
Understanding Manufacturer Warranties
When evaluating any timber playground product, it is important to understand exactly what the warranty covers and what it does not. Structural warranties on timber playground equipment typically range from five to 15 years. But a structural warranty does not cover ‘cosmetic’ deterioration, and in fact, many suppliers will go as far as to specifically state this as an exclusion.
Sapwood that is cracking, splitting and splintering may not constitute structural failure in warranty terms. It may, however, present a safety risk. Splinters can cause injury, and surface checks may create entrapment hazards if severe enough. A product that is technically within
its structural warranty can simultaneously generate safety inspection findings that require
immediate rectification, with no obligation on the manufacturer.
A structural warranty is therefore only as valuable as the product it supports. If a product retains sapwood or is made from a timber not suitable for Australian conditions, questions need to be asked as to what is and is not covered under warranty. In comparison, a 15-year warranty on a heartwood-only product provides meaningful assurance because the timber is
far less likely to experience the surface failures that commonly fall outside warranty coverage in the first place.
Typical Exclusions
Examples of common structural warranty exclusions, drawn from publicly available manufacturer warranty documentation current at the time of publication, include:
- cosmetic deterioration
- normal splitting and surface checking
- natural degradation of sapwood that does not result in structural risks
- weathering, colour variation or surface movement.
A Scenario in Two Timelines
Consider two single-bay swing installations. Product A is a timber swing with sapwood retained, purchased for approximately $10,000. Product B is a heartwood-only timber swing, purchased for approximately $15,000. Both are made from Australian Red Ironbark and carry a 15-year structural warranty. The only difference is how the timber was processed.
Product A — Sapwood Retained, 7-Year Timeline
Year 1: Installation complete. The product looks similar to Product B. Routine inspections begin as required under AS 4685:2021.
Years 2–3: Checking and splitting become visible at the sapwood boundary. The product remains in service but is generating inspection findings. Rectification work begins — filling splits, smoothing surfaces, managing splintering. The manufacturer’s structural warranty remains technically in force, but the deterioration observed is classified as cosmetic, not structural, and is not covered. The safety risk to users remains, regardless of how the warranty classifies the deterioration.
Years 3–5: Inspection findings continue to accumulate. The asset owner manages the
deterioration rather than replacing the asset, as it remains technically serviceable, despite requiring increasing maintenance. Each inspection cycle generates documentation, rectification costs and servicing time. The compliance record is growing.
Years 5–7: Deterioration has progressed beyond what rectification can address cost-effectively. The inspection record now documents a product in sustained decline. At year seven, removal is no longer avoidable. The asset is taken out of service, disposed of and replaced — despite remaining within the 15-year structural warranty period.
The replacement cost is deferred, but only while rectification costs, inspection obligations and maintenance effort continue to accumulate.
At year seven, the asset owner is starting again with a second product, a second
installation cost and no guarantee the replacement specification (if made from the
same material) is any different to the first.
Product B — Sapwood Retained, 15-Year Timeline
Year 1: Installation complete. The product looks similar to Product A. Routine inspections begin as required under AS 4685:2021.
Years 2–15: Routine inspections and cleaning continue as required under AS 4685:2021. Annual maintenance consists of cleaning, light sanding where required and reapplying one to two coats of timber treatment. The protective barrier is renewed annually and the asset continues to perform as specified.
Comparative indicative lifecycle costs of Product A and Product B
| Cost item | Product A (7-year scenario) | Product B (15-year scenario) |
|---|---|---|
| Initial purchase | $10,000 | $15,000 |
| Annual servicing and maintenance | $500–$800 | $500–$800 |
| Total maintenance | $3,500–$5,600 | $7,500–$12,000 |
| Rectification / remediation | $2,000–$5,000 | Not required |
| Removal and disposal | $500–$1,000 | Not required |
| Replacement purchase | $10,000–$15,000 | Not required |
| Replacement installation and site remediation | $3,000–$5,500 | Not required |
| Total indicative cost | $29,000–$42,100 | $22,500–$27,000 |
| Stated warranty period | 15 years* | 15 years |
At year seven — the point at which Product A has already been removed and replaced — Product B is at the midpoint of its structural warranty period and continues to perform as intended, with no remediation required. At year 15, the structural warranty period concludes. The asset is still in sound condition and continues to remain serviceable.
Case Study — Queensland School
We have observed this cost curve play out in a direct, controlled environment. At a Queensland school, products from the same hardwood species were installed simultaneously — some with sapwood retained, some with sapwood fully removed. Both products carried a 15-year structural warranty.
The sapwood-retained products began showing significant deterioration within two years of
installation. A balance beam was removed from service on safety grounds — splintering and
entrapment risk made it unsuitable for continued use. The damage was classified as cosmetic
deterioration, not structural failure.
The beam was subsequently removed by our team, stripped of its sapwood, treated
and reinstalled. The trade-off was a reduction in diameter — removing sapwood means losing
material, and the finished post was smaller than the original. However, following appropriate
treatment, it was assessed as safe and compliant for re-installation.
The heartwood-only products on the same site showed none of these issues. They continued performing as specified, remained covered under their 15-year structural warranty and required no remediation.
Same species. Same warranty period. Same installation date.
The only variable was whether the sapwood had been removed before the timber left the manufacturer’s facility. The difference in outcome was determined entirely by that single step.
What Maintenance Looks Like When Timber Is Properly Specified
When high-quality, Class 1 Australian hardwood timber is properly specified (heartwood only,
sapwood fully removed, appropriately treated during manufacture), ongoing maintenance is
minimal and straightforward.
Routine visual inspections should be conducted regularly, as required under AS 4685:2021, to
identify any obvious hazards. Quarterly, the structure should be cleaned and washed down,
fixings checked and any minor surface smoothing undertaken if needed.
Once a year, a more detailed inspection is to be carried out. The timber is cleaned, lightly sanded if required and one to two coats of timber treatment reapplied while the wood is still wet from cleaning. The timber treatment is fast drying — typically one to two hours at 25°C — and, depending on the condition of the existing coating, a single application may be sufficient.
The entire annual treatment process is anticipated to take no more than eight hours per installation, outside of normal cleaning and inspection activities.
Because the timber has been appropriately processed and treated, there is no need for
rectification, management of splintering or decaying sapwood, or the safety issues that arise from these issues. This means less maintenance burden and a product that remains fit for purpose for the full asset life.
The Specification Decision Is the Cost Decision
As demonstrated, the difference in upfront price between a sapwood-retained and a heartwood-only timber product is, in most cases, a fraction of the difference in
total cost of ownership. It is also a fraction of the liability exposure created by an asset that
deteriorates in a public environment while inspection records accumulate.
The specification decision is made once. The consequences of that decision play out for years. Getting it right at the start is not simply a premium investment. It is the more economical choice over the life of the asset.
The most economical asset is rarely the one that costs the least to build. It is the one that delivers the greatest value over its intended lifespan.
Key Takeaways
- The purchase price of a playground asset represents only a fraction of its total lifecycle cost.
- Inspection, maintenance, rectification, replacement and compliance obligations should
all be considered when evaluating timber products. - Structural warranties do not necessarily cover the forms of deterioration most likely to
generate maintenance and safety obligations. - Timber manufactured from heartwood only requires significantly less remediation over its service life, reducing maintenance burden and extending asset performance.
- A small difference in upfront cost can result in a significant difference in whole-of-life value.
Specification Implications
When evaluating timber playground products, consider:
- What is the anticipated lifecycle cost of this product — not just its purchase price?
- What maintenance activities are expected over the life of the asset, and how frequently will they be required?
- What is excluded from the manufacturer’s warranty?
- Does the proposed specification minimise future maintenance burden, operational costs
and asset replacement risk?
Read the full white paper
This article is an excerpt from Specifying with Confidence: Rethinking Timber in Public Play, an educational white paper exploring the considerations, challenges and opportunities of specifying timber in public play spaces. Discover practical insights and expert guidance to help inform material selection, design decisions and long-term performance.
Download the full white paper via the link below to explore the complete guide.