Johnstone River hardwood is a native Queensland tree that produces a rich, striped, attractive timber. It is prized for its hard wearing yet handsome properties and makes excellent flooring.
Backhousia bancroftii
The Johnstone River hardwood is a medium sized hardwood from the Cairns district of northern Queensland. Its heartwood features various shades of brown, and is often dark and sometimes striped. The timber's texture is fine and even with a variable grain that is usually free of defects. Sapwood is distinctly paler.
Johnstone River hardwood timber is popular as a flooring material, as its beautifully rich appearance also resists indentation. Parquetry featuring this timber is particularly fine and readily available in most metropolitan centres.
Shrinkage
| Very Low | Low | Medium | High | Very High | |
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Tangential :
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6.40% | ||||
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Radial :
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Unit Movement Tangential:
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0.39% | ||||
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Unit Movement Radial:
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Strength Group
| Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
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| Unseasoned: | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
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| Seasoned: | SD1 | SD2 | SD3 | SD4 | SD5 | SD6 | SD7 | SD8 |
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Stress Grade
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Structural No. 1 |
Structural No. 2 |
Structural No. 3 |
Structural No. 4 |
Structural No. 5 |
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| Unseasoned: | F27 | F17 | F14 | F11 | F8 |
| Seasoned: | F27 | F22 | F17 | F14 | F11 |
Density per Standard
| Seasoned: | 950kg/m3 |
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| Unseasoned: | 1150kg/m3 |
Joint Group
| Very High | High | Reasonably High | Medium | Low | Very Low | |
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| Unseasoned: | J1 | J2 | J3 | J4 | J5 | J6 |
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| Seasoned: | JD1 | JD2 | JD3 | JD4 | JD5 | JD6 |
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Colour
| White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
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Mechanical Properties
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Modulus of Rupture - Unseasoned:
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Modulus of Rupture - Seasoned:
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Modulus of Elasticity - Unseasoned:
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Modulus of Elasticity - Seasoned:
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Maximum Crushing Strength - Unseasoned:
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Maximum Crushing Strength - Seasoned:
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Impact - Unseasoned:
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Impact - Seasoned:
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Toughness - Unseasoned:
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Toughness - Seasoned:
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Hardness - Unseasoned:
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Hardness - Seasoned:
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Durability
| Low | Moderate | Reasonably High | High | |
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| (0 - 5 yrs) | (5 - 15 yrs) | (15 - 25 yrs) | (more than 25 yrs) | |
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In-Ground:
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| (0 - 7 yrs) | (7 - 15 yrs) | (15 - 40 yrs) | (More than 40 yrs) | |
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Above ground:
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| (0 - 20 yrs, usually < 5) | (21 - 40 yrs) | (41 - 64 yrs) | (More than 60 yrs) | |
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Marine Borer Resistance:
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Lyctid Borer Susceptibility:
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Susceptible |
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| Lyctid Borer Susceptibility - Other: | |
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Termite Resistance:
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Not Resistant |
Fire Properties
| 1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
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Fire Properties Group Number: |
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| Group Number - Other: | 3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm |
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Average Specific Extinction Area:
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<250 |
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Bushfire Resistance:
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BAL 12.5 and 19 – All AS3959 required applications |
Johnstone River hardwood produces a fine and attractive timber. The heartwood offers various shades of brown, is often dark and sometimes striped. The timber's texture is fine and even with a variable grain that is usually free of defects. The sapwood is distinctively paler than the heartwood.
Johnstone River hardwood timber is popular as a flooring material, as its beautifully rich appearance also resists indentation. Parquetry featuring this timber is particularly fine and readily available in most metropolitan centres.
QLD
