Jarrah – Western Australian

Red Timber Species

Species Name: Jarrah

Botanical name(s): Eucalyptus marginata

Size and location information: Jarrah is a large sized hardwood found only in the south west of Western Australia. It is Western Australia’s principal tree in terms of both the extent of forest and in the versatility of its timber.
The bark is rough, covering the whole trunk to the smallest branches and is similar to that of the stringybarks.

Description: The heartwood varies from rich reds to deep browns, with sapwood being a clearly distinguished pale yellow. The texture is course and generally straight grained although some interlocked grain may feature.

Density: Green: 1100kg/m3 Dry: 850kg/m3

Janka Hardness Rating: Green: 5.7, Dry: 8.5

Shrinkage: 5% Radial, 7.4% tangential

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

Lyctids Susceptibility: Yes

Termite Resistance (AS3660): Yes

Strength Group: S4/SD4

Fire Hazard properties:
Ignitability: 13
Spread of flame: 6
Smoke Development: 3

The material works well.

Flooring, joinery, panelling, sleepers, poles and piles, heavy construction and domestic structural framing.

Becoming less as Jarrah forests are being protected.

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