Spotted Gum

Brown Timber Species

Species Name: Spotted Gum

Botanical name(s): ECorymbia maculata

Size and location information: A large hardwood of very common occurrence growing in an area ranging from the New South Wales/Victorian border to the Maryborough district in Queensland.

It is quite a tall tree up to 50 metres in height. The tree sheds elliptical strips of bark as it weathers and the resultant mottled or spotted appearance lends itself to its common name.

Description: The heartwood colour range is quite broad from very pale browns through to very dark browns. Some samples may have a slightly orange tint in the lighter variations. The sapwood is distinctly paler. The grain is often interlocked and generally features some 'fiddleback' figure. This wavy type grain may be quite distinctive.

This species is sometimes known as Spotted Iron Gum, due to the nature of the timber, which is very dense with excellent mechanical properties. The raw timber has a slightly greasy feel, a property which is well regarded and utilised in tool handles (a common use for this species).

Density: Green: 1200kg/m3 Dry: 1100kg/m3

Janka Hardness Rating: Green: 8.0, Dry: 10.1

Shrinkage: 4.5% Radial, 6.0% tangential

Durability: In ground: Class 2 Above ground: Class 1

Lyctids Susceptibility: Yes

Termite Resistance (AS3660): Yes

Strength Group: S2/SD2

Fire Hazard properties:
Ignitability: 13
Spread of flame: 3
Smoke Development: 3

Workability

Uses:
Piles, poles, flooring, joinery, decking, tool handles.

Availability:
Plentiful. Select joinery grade grade tends to have a lot shorter length spec.

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