Jarrah – Western Australian
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:
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.