Internal Panelling

External Cladding

Decking

Screening

Spotted Gum

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.

Properties

Species Name Spotted Gum
Botanical Name Eucalyptus maculata, Syn: Corymbia maculata, C. citriodora, Syn: E. citriodora, C. henryi, Syn: E henryi
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
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

R
Naturally Lyctus SusceptibleS = Susceptible

NS = Non susceptible

S
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