Timber Technical Information

Red Iron Bark
Spotted Gum
Forest Red Gum

Red Ironbark

The technical information below is based on a report undertaken by the Queensland Government's Department of Primary Industries and Fisheries in November 2004.


Description:

Red-brown to dark red, with paler-coloured sapwood.
Fine texture and extremely hard-wearing.
Grain usually interlocked.

Species:

Narrow-leaved red ironbark: Eucalyptus crebra
Broad-leaved red ironbark: E. fibrosa subsp. fibrosa

Application:

Red Ironbark is referred to as “an excellent engineering timber renowned for outstanding durability in weather-exposed applications.”
Red ironbarks have a “proven record for long-term performance in weather-exposed structural applications.”
The narrow-leafed species has “superior weathering properties and is less prone to surface checking than many other timbers used in outdoor applications such as decking.”
External: suited for all building construction materials from poles, framing, flooring, decking, cladding, and furniture.
Internal: flooring, furniture.

Fire rating:

Red ironbark timber components 18mm thick or greater do not require fire retardant treatment for use in construction in bush-fire prone areas.

Wood properties: Narrow-leaved Broad-leaved
Air dry density kg/m3 1090 1120
Shrinkage (green to air-dry) 5% tangential
3.5% radial
6.5% tangential
4.5% radial
Hardness (Janka value) kN 12(green); 14 (dry) 12(green); 14 (dry)
Strength groups S2 (green); SD3(dry) S1(green); SD1 (dry)
Stress grades F11, F14, F17, F22 (green)
F14, F17, F22, F27 (dry)
F14, F17, F22, F27 (green)
F22, F27, F34 (dry)
Joint group 1 1
In-ground durability 1 (very durable) 1 (very durable)
Above-ground durability 1 (very durable) 1 (very durable)
Fixing No difficulties with standard fittings and fasteners
Finishing Accepts paints, stains, polish and paint

Spotted Gum

The technical information below is based on a report undertaken by the Queensland Government's Department of Primary Industries and Fisheries in November 2004.


Description:

A “premium” Australian hardwood timber.
Colour range varies depending on the location of the source forest. Heartwood ranges from light-brown to definite browns to deep red-brown hues. Sapwood is white to light-brown in colour and can be up to 50mm wide.
Texture: moderately coarse and uneven. Some material includes additional features: wavy grain, fiddleback figure and gum (kino) veins.
Slightly greasy feel aids machining and boring.
In comparison with other Australian hardwoods spotted gum is a minimal staining timber that's less prone to bleed-through of tannins than other species.

Species:

Corymbia citriodora subs. citriodoraa

Application:

A proven long history for engineering applications.
External: suited for all building members - posts, poles, framing, decking and cladding. Furniture..
Internal: flooring, lining, furniture.

Fire rating:

Spotted gum components 18mm thick or greater do not require fire retardant treatment for use in construction in bush-fire prone areas.
One of only seven species tested (as of Nov 2004) satisfying the Australian Standards Criteria for fire rating:
   Ignitability index (0-20) 13
   Spread of flame (0-10) 3
   Heat-evolved index (0-10) 4
   Smoke-developed index (0-10) 3

Wood properties:  
Air dry density kg/m3 1010kg/m3
Shrinkage (green to air-dry) 6.1% tangential; 4.3% radial
Hardness (Janka value) kN 8kN (green); 11 kN (dry)
Strength groups S2 (green); SD2(dry)
Stress grades F11, F14, F17, F22 (green)
F17, F22, F27, F34 (dry)
Joint group 1
In-ground durability 2 (durable)
Above-ground durability 1 (very durable)
Fixing Green timber is corrosive to aluminium fittings
Finishing Accepts paints, stains, polish and paint

Forest Red Gum

The technical information below is based on a report undertaken by the Queensland Government's Department of Primary Industries and Fisheries in November 2004.


Description:

A versatile timber with excellent hardness and durability properties.
Red in colour varying from light to dark red with paler sapwood.
Course but even-textured. Grain often interlocked.

Species:

Eucalyptus tereticornis

Application:

A proven long history for engineering applications.
External building members: posts and poles, framing, flooring, lining, decking and cladding. Outdoor furniture.
Internal: flooring and furniture.

Fire rating:

Does not require fire retardant treatment for use in construction in bush-fire prone areas.

Wood properties:  
Air dry density kg/m3 1010kg/m3
Shrinkage (green to air-dry) 8.6% tangential; 4.8% radial
Hardness (Janka value) kN 12kN (green); 12 kN (dry)
Strength groups S3 (green); SD4(dry)
Stress grades F8, F11, F14, F17 (green)
F11, F14, F17, F22 (dry)
Joint group 1
In-ground durability 1 (very durable)
Above-ground durability 1 (very durable)
Fixing No difficulties with standard fittings and fasteners
Finishing Accepts paints, stains, polish and paint

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