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Spotted Gum Timber Flooring Guide

Spotted Gum Timber Flooring Guide

Spotted Gum (Corymbia maculata) is widely regarded as Australia's most popular hardwood for flooring and decking. Native to the eastern seaboard from Victoria to Queensland, this stunning timber combines exceptional hardness with a remarkable range of natural colours and a distinctive grain that sets it apart from every other species.

Appearance & Character

Spotted Gum is celebrated for its extraordinary colour variation — ranging from pale creamy browns and soft greys through olive greens to rich dark chocolate. The grain is typically wavy or interlocked, often producing a sought-after fiddleback figure that gives each board unique character. The "spotted" name comes from the tree's bark, which sheds in patches to reveal smooth new bark beneath.

Technical Specifications

Scientific Name Corymbia maculata
Janka Hardness 11.0 kN
Density 950–1100 kg/m³ (air-dry)
Durability Class Class 1 (AS 5604)
Termite Resistance Resistant
Bushfire Rating BAL-29 compliant
Above-Ground Life 40+ years

Why Choose Spotted Gum for Flooring?

  • Outstanding hardness — 11.0 kN Janka makes it one of the hardest commercial flooring timbers
  • Stunning colour variation — natural palette from cream to chocolate creates a visually rich floor
  • Distinctive fiddleback grain — wavy interlocked grain gives each board unique character
  • Bushfire resistant — meets BAL-29 requirements for fire-prone areas
  • Class 1 durability — highest rating for above-ground and in-ground applications
  • Naturally termite resistant — dense heartwood provides excellent protection
  • Versatile use — equally suited to indoor flooring, outdoor decking, and cladding
  • Sustainably available — highest-volume native hardwood harvested in QLD

Considerations

  • High colour variation means careful board selection is needed for uniform appearance
  • Very hard timber requires professional sanding equipment
  • Interlocked grain can cause surface checking if not properly finished
  • Tannin bleed can stain surrounding surfaces if not sealed properly
  • Some boards may contain gum veins — a natural feature

Sanding & Refinishing

Spotted Gum is a challenging but rewarding timber to sand. The interlocked grain requires careful technique to avoid scratching or tearing the surface. Professional-grade equipment with sharp abrasives is essential. Once properly sanded, Spotted Gum reveals extraordinary depth of colour and grain. Both polyurethane and oil finishes work beautifully, with oil finishes particularly enhancing the natural colour variation.

Maintenance Tips

  • Sweep or vacuum regularly to prevent grit causing micro-scratches
  • Damp-mop with a pH-balanced hardwood floor cleaner — never wet-mop
  • Avoid vinegar, ammonia, and steam mops
  • Use felt pads under furniture legs and doormats at all entries
  • Protect from prolonged direct sunlight to slow colour change
  • Re-coat every 7–10 years for polyurethane; re-oil annually for oil finishes

Sustainability

Spotted Gum is the highest-volume native hardwood harvested in Queensland and is also widely available from managed forests in NSW. It remains one of Australia's most sustainably sourced domestic hardwoods, with strong regrowth characteristics and well-managed forestry operations ensuring long-term supply.

Frequently Asked Questions

Is Spotted Gum harder than Blackbutt and Jarrah?

Yes. With a Janka hardness of 11.0 kN, Spotted Gum is harder than both Blackbutt (9.1 kN) and Jarrah (8.5 kN). Only Ironbark (14.0 kN) commonly exceeds it among Australian flooring timbers.

Why does Spotted Gum vary so much in colour?

The natural colour range is one of Spotted Gum's defining features. Variation occurs between trees, within individual logs, and even within single boards. This is considered a premium characteristic, not a defect, and creates visually dynamic floors.

Is Spotted Gum good for outdoor decking?

Excellent. Spotted Gum's Class 1 durability, BAL-29 bushfire rating, and natural resistance to termites and decay make it one of Australia's top choices for outdoor decking, particularly in coastal and bushfire-prone areas.

Does Spotted Gum need special finishing?

Spotted Gum's high tannin content means it benefits from a sealer coat before the main finish to prevent tannin bleed. Both polyurethane and oil finishes work well, with oil finishes particularly popular for enhancing the natural colour variation.

How does Spotted Gum compare to European Oak?

Spotted Gum is significantly harder (11.0 kN vs 5.0 kN Janka) and more durable than European Oak. Oak offers a more uniform, contemporary look, while Spotted Gum provides more natural character and colour variation. Spotted Gum is also better suited to Australian conditions.