Posted on

Ironbark A Brief Guide to the Hardwood Timber Type

plan PNF

Do you know what timber species is used the most for decking and flooring projects? It’s the Ironbark, a type of hardwood that offers a high level of durability and strength. Here, we will learn more about the species including its origin and best uses.

The Origin of Ironbark Timber

The New South Wales native, Ironbark is also known as the Grey Ironbark. It is harvested from the Eucalyptus Paniculata trees that grow in coastal areas with high rainfall. Although the usual height of an ironbark tree is 20-30 metres, some have grown up to 56 metres high with 1.96 metres diameter. Its bark features heat and fire resistance and appears like an iron slag, which is where it gets its name from.

The Color

Most of the ironbark timber species are red but the colours can vary from pale brown to dark brown to dark red.

Susceptibility to Pests

It varies with the type of ironbark timber. The heartwood offers class 3 resistance while the sapwood isn’t susceptible to lyctid borers. It has termite resistance above the ground.


With 1 as its rating, ironbark’s class 1 timber carries the highest durability. Besides its durability and hardness, its heaviness makes it a great choice for structural constructions.

Best Uses

The density and weight of ironbark hardwood make it a great material for big jobs but it isn’t the right wood for precision work. Primary applications include outdoor framing, handrails, decking, and flooring that use timber. It is also used for industrial applications in railway sleepers, construction, and shipbuilding.

Are you planning to invest in a timber business? You should get a PNF plan prepared for a compliant and rewarding private forest.