Spotted Gum Timber Guide

Everything you need to know about spotted gum timber.

Spotted Gum Timber Technical Information


Spotted Gum (Eucalyptus maculata)

Spotted Gum is one of Australia’s premium native hardwoods with a striking appearance and a high degree of natural durability and strength, making it an ideal timber for a variety of structural, exterior and interior applications. Architects and designers throughout the world value Spotted Gum timbers for their back-sawn grain structure, attractive markings and vibrant colour palette. The colour varies with this specie from pale grey browns and soft creams to a rich chocolate brown. A very tough timber, its frequent wavy grain can produce an attractive and highly valued fiddleback effect. The wood has a slightly greasy feel, a characteristic that aids machining and boring. Spotted Gum components that are 18mm thick or greater do not require fire retardant treatment for use in construction in bush-fire prone areas.

Spotted Gum is used in engineering applications such as wharf and bridge construction, railway sleepers, cross-arms and mining timbers. It is suitable for a range of building applications, such as posts and poles, framing, flooring, lining, decking and cladding.


Physical Properties

  • Dry Density: 950 kg/m³
  • Janka Dry Hardness: 11 kN

The Janka rating is the hardness level given to each species. The higher the number, the greater the hardness.
The natural colour variation within a timber species is normal and one of its most appealing characteristics.

Fire Test Certification
Fire Test Report

Colour Range Brown
Janka (Hardness) Rating – Dry 11
Natural Durability Class In-ground contact 2
Outside above ground contact 1
Density (kg/m3) Unseasoned (Green) 1150
Seasoned (Dry) 990
Strength Group Unseasoned (Green) S2
Seasoned (Dry) SD2
Joint Group Unseasoned (Green) J1
Seasoned (Dry) JD1
Fire Indices Spread-of-Flame Index 3
Fire Rating BAL29
Smoke-Developed Index 3
Critical Radiant Flux >2.2 and <4.5
Smoke Development Rate <750
Group Number 3
Naturally bushfire-resisting Timber Yes
Tangential Shrinkage % 6.1
Toughness (Nm) Naturally Unseasoned (Green) 20
Seasoned (Dried) 24
Naturally Termite Resistant to AS3660R = Resistant

NR = Non resistant

Naturally Lyctus SusceptibleS = Susceptible

NS = Non susceptible