Timber Species: Tasmanian Oak (Eucalyptus delegatensis / Eucalyptus regnans / Eucalyptus obliqua)
Dry Density: 650 kg/m³
Janka Hardness: 5.5 kN
These properties are only a guide, as timber is a natural product there will be variations within any species. The Janka Dry Hardness rating measures the hardness of the wood. The higher the number the harder the wood.
Species Description: Tasmanian Oak
Timber marketed as Tasmanian, or “Tassie Oak” is most often a combination of three distinct species of tree, all of which are found most often in – you guessed it – Tasmania, and while they are all certainly similar there is a wide amount of variation between the three.
Most commonly made from a combination of alpine ash, mountain ash, and messmate, Tasmanian oak is characterised by the commonalities between all three species. All closely related eucalyptus varietals, these trees tend to be straight-trunked, hardy, sub-alpine evergreens that require moderate to high levels of rainfall.
While referred to as “Tasmanian” or “Tassie” oak, all three varietals that are used in the construction of this timber aren’t found exclusively in Tasmania. Many examples can be found in Victoria and New South Wales as well in more mountainous or hilly regions, or anywhere there’s well-drained soil with temperate to cool climate conditions.
Providing straight and uniformly even grain because they’re quarter split, Tasmanian oak mixes are used to produce blends of pleasantly coloured blonde woods that range in shade from reddish-brown, pink, to pale cream.
Easy to work but not known for its durability, Tasmanian oak timbers are on average low on the Janka hardness scale at just 5.5 and relatively light with densities ranging from 650 to 1050 kg/m³ on average, but this will, of course, vary greatly depending on the ratio of the three different types of wood used to create the flooring.
Parquetry and solid timber flooring are the two most common places to see Tassie Oak used, as it allows this unique timber blend to showcase the variations in colour and texture. As a soft, light wood, Tasmanian oak isn’t suited to outdoor decking or use in engineered wood.
Technical Properties of Tasmanian Oak
Eucalyptus delegatensis / Eucalyptus regnans / Eucalyptus obliqua
Janka (Hardness) Rating – Dry
Natural Durability Class
Outside above ground contact
Critical Radiant Flux
Smoke Development Rate
Naturally bushfire-resisting Timber
>2.2 to <4.5
Tangential Shrinkage %
Naturally Termite Resistant to AS3660
(NR) NON RESISTANT
Naturally Lyctus Susceptible
This page was updated at 4.36pm, 23 February 2018