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Blackbutt, Western Australian

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Western Australian blackbutt is a large Australian hardwood that grows in the wetter southwest jarrah and karri forest areas of Western Australia. It is generally in very limited supply, in part to it growing in reserves.

Also known as yarri, it is lighter in appearance than blackbutt, Eucalyptus pilularis. The heartwood is a pale yellowish brown, while the sapwood is much paler in appearance.

Western Australian blackbutt has a medium to course texture and an interlocked grain, which can make this species harder to work. Apart from this it has good workability characteristics. Pinholes may also be present but can sanded or polished out during finishing.

Western Australian blackbutt is used for general construction applications, flooring and joinery.

Appearance

Western Australian blackbutt is lighter in appearance than blackbutt, Eucalyptus pilularis. The heartwood is a pale yellowish brown, while the sapwood is much paler in appearance. 

It has a medium to course texture and an interlocked grain, whereas other blackbutt varieties tend to have a straight grain.

Common Applications

Western Australian blackbutt is mainly used in flooring.

Common Form

Sawn

Workability

Western Australian blackbutt has a medium to course texture and an interlocked grain, which can make this species harder to work. Apart from this it has good workability characteristics. Pinholes may also be present but can sanded or polished out during finishing.

Origin of Timber

WA

Availability - Further Information

Western Australian blackbutt is in quite limited supply and generally only available in Western Australia.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

10.00%

Radial:

5.00%

Unit Movement Tangential:

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:

F14

F11

F8

F7

F5

Seasoned:

F17

F14

F11

F8

F7

Density per Standard

Seasoned:

850kg/m3

Unseasoned:

1100kg/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:

66

Modulus of Rupture - Seasoned:

99

Modulus of Elasticity - Unseasoned:

12

Modulus of Elasticity - Seasoned:

13

Maximum Crushing Strength - Unseasoned:

37

Maximum Crushing Strength - Seasoned:

65

Impact - Unseasoned:

13

Impact - Seasoned:

11

Toughness - Unseasoned:

Medium - 15 - 24 Nm

Toughness - Seasoned:

Medium - 15 - 24 Nm

Hardness - Unseasoned:

5.5

Hardness - Seasoned:

6.9

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:

Resistant

Fire Properties

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

Fire Properties Group
Number:

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications

Flooring

Whether for structural or finished flooring applications, timber offers durability, versatility and adaptability. The warmth, strength and natural beauty of timber flooring has proved enduringly popular in a wide variety of interior settings.

Timber flooring is a timeless product, offering a warmth and natural beauty largely unmatched by other flooring options. This article provides an overview of the installation of solid timber strip flooring over bearers and joists, timber based sheet flooring products and concrete slabs. Timber flooring is typically supplied as either solid timber or laminated wood products, made from layers of bonded timber. It fits together with a tongue and groove joint and once in place, is sanded and finished. There is a wide variety of species to select flooring from and the right species for a given application will be dependent on numerous factors. Information relating to species selection, environmental assessment, finish selection and recommended maintenance routines are all provided in this section.

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