Red Ironbark (broad-leaved) 

queensland forest map

Find out more about Broad-leaved Red Ironbark

The botanical name for Broad-leaved Red Ironbark is Eucalyptus fibrosa/Eucalyptus sideroxylon. It is most commonly called Red Ironbark, however, most do not know that there are two varieties - broad- and narrow-leaved. Broad-leaved Red Ironbark is grown mainly inland in Southern Queensland, south to Moruya and west to the Tablelands. It is a reputed structural hardwood due to its long-term durability and performance in weather-exposed conditions.

red ironbark native hardwood structural framing flooring

What does Broad-leaved Red Ironbark look like?

Broad-leaved Red Ironbark has a deep dark red to reddish brown heartwood that is contrasted by its pale yellow sapwood. It displays an interlocked grain with a fine, even texture.

red ironbark native hardwood structural timber decking framing flooring

What is Broad-leaved Red Ironbark used for?

Common applications for Broad-leaved Red Ironbark include:

  • In-ground framing
  • Exposed above ground framing
  • Decking
  • Internal flooring
  • External and weather exposed applications including cladding
  • Wharfs & bridges
timber merchant brisbane broad leaved red ironbark queensland timber species

Where can I purchase Broad-leaved Red Ironbark?

Red Ironbark of both varieties is readily available at all Queensland Timber Merchant Network members. Search for your local supplier via the Accredited Queensland Timber Merchant postcode search tool.


Where can I find more information about the use and application of Broad-leaved Red Ironbark?

For more detailed information than the Red Ironbark property table below, visit WoodSolutions or download 'Construction timbers in Queensland' which describes the properties of timbers used in the construction of Class 1 to Class 10 buildings (e.g. houses, carports, garages, greenhouses and sheds) in Queensland, as well as other purposes such as furniture, landscaping and outdoor structures (e.g. playgrounds, fences).

red ironbark bark native hardwood structural timber

Image via By John Tann from Sydney, Australia (Ironbark bark) [CC BY 2.0 (], via Wikimedia Commons

What are the properties of Broad-leaved Red Ironbark?

Termite resistance

Termite resistant


This is the measure of the percentage reduction from the unseasoned to 12% moisture content condition.



Mass divided by volume, expressed in kg/m3 when describing timber

Very High Density


High Toughness

Bushfire resistance

Bushfire rated


The strength of Australian timber is described in terms of "stress grades". Stress Grading is a way of classifying timber, either visually or by mechanical means to indicate the basic properties to be used for structural design purposes. The stress grade is designated in a form such as "F17", which indicates the relative bending capacity of the timber.

F17 – F27

About Us

The Accredited Queensland Timber Merchant Network (AQTMN) is a group of Queensland owned and operated businesses with the aim of growing Queensland's forest and timber industry.

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