Timber Species: Tasmanian Oak (Eucalyptus delegatensis / Eucalyptus regnans / Eucalyptus obliqua)

Physical Properties

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.

Tasmanian Oak, Australian Hardwood Species

Tasmanian Oak, Australian Hardwood Species used for Timber Plank Flooring and Parquet.

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.

 

 

Australian Hardwood Timber Species | Turpentine

 Technical Properties of Tasmanian Oak

Species Name

Tasmanian Oak

Botanical Name

Eucalyptus delegatensis / Eucalyptus regnans / Eucalyptus obliqua

Colour Range

Blondes

Janka (Hardness) Rating – Dry

5.5

Natural Durability Class

In-ground contact
Outside above ground contact

4

3

Density (kg/m³)

Unseasoned (Green)
Seasoned (Dry)

1050

650

Strength Group

Unseasoned (Green)
Seasoned (Dry)

S4

SD4

Joint Group

Unseasoned (Green)
Seasoned (Dry)

J3

JD3

Fire Indices

Spread-of-Flame Index
Smoke-Developed Index
Critical Radiant Flux
Smoke Development Rate
Group Number
Naturally bushfire-resisting Timber

8

3

>2.2 to <4.5

<750

3

UNKN OWN

Tangential Shrinkage %

13.3

Toughness (Nm)

Naturally Unseasoned(Green)
Seasoned (Dried)

13

 15

Naturally Termite Resistant to AS3660

(NR) NON RESISTANT

Naturally Lyctus Susceptible

 SUSCEPTIBLE

This page was updated at 4.36pm, 23 February 2018

Summary
Tasmanian Oak. Hardwood Species Specification Data
Article Name
Tasmanian Oak. Hardwood Species Specification Data
Description
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.
Author
Publisher Name
Better Timber Flooring
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