Johnstone River Hardwood

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.

Botanical Name

Backhousia bancroftii

Common Form
Sawn
Species Type

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

Tangential :

6.40%

Radial :

Unit Movement Tangential:

0.39%

Unit Movement Radial:

Strength Group

Very High

High

Reasonably High

Medium High

Medium

Reasonably Low

Low

Very Low

Unseasoned:

S1

S2

S3

S4

S5

S6

S7

Seasoned:

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

Stress Grade

Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5

Unseasoned:

F27

F17

F14

F11

F8

Seasoned:

F27

F22

F17

F14

F11

Density per Standard

Seasoned:

950kg/m3

Unseasoned:

1150kg/m3

Joint Group

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

J5

J6

Seasoned:

JD1

JD2

JD3

JD4

JD5

JD6

Colour

  White, yellow, pale straw to light brown Pink to pink brown Light to dark red Brown, chocolate, mottled or streaky
   

Mechanical Properties

Modulus of Rupture - Unseasoned:

Modulus of Rupture - Seasoned:

Modulus of Elasticity - Unseasoned:

Modulus of Elasticity - Seasoned:

Maximum Crushing Strength - Unseasoned:

Maximum Crushing Strength - Seasoned:

Impact - Unseasoned:

Impact - Seasoned:

Toughness - Unseasoned:

Toughness - Seasoned:

Hardness - Unseasoned:

Hardness - Seasoned:

Durability

Low Moderate Reasonably High High
(0 - 5 yrs) (5 - 15 yrs) (15 - 25 yrs) (more than 25 yrs)

In-Ground:

(0 - 7 yrs) (7 - 15 yrs) (15 - 40 yrs) (More than 40 yrs)

Above ground:

(0 - 20 yrs, usually < 5) (21 - 40 yrs) (41 - 64 yrs) (More than 60 yrs)

Marine Borer Resistance:

Lyctid Borer Susceptibility:

Susceptible

Lyctid Borer Susceptibility - Other:

Termite Resistance:

Not Resistant

Fire Properties

1 - non-combustible 2 - reasonably non-combustible 3 - slightly combustible 4 - combustible

Fire Properties Group
Number:

Group Number - Other:

3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications
Appearance

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.

Common Applications

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.

Workability

As it is an extremely hard timber, Johnstone River hardwood is difficult to work and glue. 

Origin of timber
QLD
Readily Available
QLD
Johnstone River hardwood is a relatively rare species but can be found as parquetry flooring in main metropolitan centres.
Image

Flooring

The warmth, strength and natural beauty of timber flooring is enduringly popular in a wide variety of domestic, commercial and industrial applications.

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