Australia’s Hardest Hardwood, Built to Last Outdoors
Ironbark (Eucalyptus sideroxylon and related Red Ironbark species) grows across eastern and southern Australia and takes its name from the thick, dark, deeply furrowed bark that protects the tree. The heartwood ranges from deep red to dark red-brown, occasionally almost chocolate, contrasting with a paler sapwood, with an interlocked grain and a moderately coarse, even texture. As screening, that rich colour and dense grain make a bold, premium statement that weathers handsomely over time. What sets Ironbark apart is its sheer density — around 1,120 kg/m³, among the heaviest commercial timbers in Australia — which translates directly into performance: a Class 1 durability rating (the highest), a Janka hardness around 14 kN, natural termite and decay resistance, and approval for use up to BAL-29 in bushfire-prone areas. For an outdoor screen that needs to perform for decades with minimal fuss, Ironbark is the benchmark. The sapwood is lyctid-susceptible, so heartwood should be specified.
Why Choose Ironbark Screening
Technical Specifications
Botanical name
Eucalyptus sideroxylon (and related Red Ironbark species)
Colour
Deep red to dark red-brown; paler, distinct sapwood
Natural durability
Class 1 above ground (highest rating)
Janka hardness
approx. 14 kN
Density (seasoned)
approx. 1,120 kg/m³
Termite resistance
Naturally resistant (heartwood); sapwood lyctid-susceptible
Bushfire rating
Suitable up to BAL-29 (confirm per AS 3959)
Grain & texture
Interlocked grain, moderately coarse even texture
Typical applications
Outdoor screening, decking, cladding, posts, structural
Where Ironbark Screening Performs Best
Premium outdoor privacy screens along boundaries, decks and pool areas.
Feature fences and entry screens that make a bold statement.
Slatted sunscreens and louvres in exposed positions.
Screens in designated bushfire-prone areas up to BAL-29 (confirm per AS 3959).
Carport, pergola and structure infill exposed to the weather.
High-traffic commercial screening that must resist wear and last.
Ironbark Screening Profiles & Spacing
Ironbark screening is supplied as battens and slats in a choice of square and rectangular sections. The section size and the spacing you set between battens together determine how the finished screen looks and performs: narrower battens with tight gaps read as fine and private, while wider battens or generous gaps feel bold, open and airy. As a guide, closer spacing increases privacy and shade but reduces airflow and light, so it pays to set out a sample bay or mock-up to confirm the look before committing to the full run. Because Ironbark is so dense and rich in colour, even relatively fine battens make a substantial, premium-looking screen, and the deep red tones look striking against render, masonry and greenery. Whatever profile and spacing you choose, fixing the battens to a sound, well-set-out frame is the key to a crisp, professional result. Our team can talk through batten sizes, spacings and frame options and help you order the right quantity with minimal waste. It is also worth thinking about orientation and viewing angle when you design a Ironbark screen. Vertical battens tend to draw the eye upward and suit boundary and privacy screens, while horizontal battens give a low, contemporary, streamlined look; the angle a screen is viewed from changes how open or private it appears, so a screen that looks airy head-on can read as near-solid from an angle. For privacy screens in particular, we recommend building a small sample bay and checking it from the key sightlines — from a neighbour’s window, a deck or the street — before locking in the final batten size and spacing. A little planning here makes the difference between a screen that merely looks good and one that does exactly the job you need.
Get Your Free QuoteWorking With and Maintaining Ironbark
Ironbark is extremely dense, so pre-drill every fixing to prevent splitting and use high-quality stainless steel screws (304 or 316 grade near the coast) that can handle the timber’s density and resist corrosion; keep tooling sharp. Fix battens to a sound, well-set-out frame or posts with consistent gaps, allow for natural movement, and seal cut ends. Where the screen forms part of a bushfire-rated assembly or balustrade, confirm the relevant detailing. Maintenance is refreshingly low. Left uncoated, Ironbark weathers to an attractive silver-grey while retaining its strength. To keep the rich red tones, clean the screen periodically and apply a quality exterior decking-grade oil once or twice a year depending on exposure. Because the heartwood is so naturally durable, no chemical treatment is required for above-ground screening, though sealing exposed end-grain is good practice.
Get Your Free QuoteSustainable & Ethically Sourced
JVS Timber sources Ironbark from certified Australian producers and supplies product compliant with Australian industry standards. Choosing a Class 1 hardwood that lasts for decades is itself a sustainable decision — an outdoor screen that does not need replacing saves material and waste over its lifetime. FSC-certified options are available on request.
Get Your Free QuoteIronbark Screening Sizes & Availability
JVS Timber supplies Ironbark screening as battens and slats in popular square and rectangular sections and a choice of lengths. Whether you need a small quantity for a single screen or bulk battens for a fencing run or commercial project, our team can confirm current stock, sections, profiles and competitive trade pricing, delivered Australia-wide. As Ironbark is a premium, in-demand hardwood, we recommend confirming availability early.
Get Your Free QuoteIronbark Screening — Frequently Asked Questions
Ironbark carries a Class 1 durability rating — the highest available — and is among the hardest, most decay- and termite-resistant timbers in Australia. For a long-lasting, low-maintenance outdoor screen, it is at the very top tier.