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Stringybark, Brown

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Brown stringybark is a hardwood species occurring in coastal and high-rainfall regions of southern New South Wales, Victoria, South Australia and Kangaroo Island. It can grow to heights of up to 40 metres.

As its trade name suggests, brown stringybark heartwood is pale brown in colour. Its texture is medium and even, with considerable variation in grain. Gum veins are common.

Brown stringybark timber exhibits moderate strength and durability, and is not recommended for in-ground applications. The sapwood of the species, not always visually distinct from the true wood, is immune to lyctid borer (powder post beetle) attack.

Although the timber of this species is not especially difficult to work, common applications are limited to general construction, notably building framework, and firewood. 

Brown stringybark timber products are readily available throughout Victoria, and parts of New South Wales and South Australia.

Appearance

The heartwood of this brown stringybark is a pale brown colour. Sapwood may not be clearly defined. Its texture is medium and even with considerable variation in grain. Gum veins are common.

Common Applications

Brown stringybark is commonly used for building framework and for fuel.

Common Form

Sawn

Workability

Brown stringybark is not difficult to work.

Origin of Timber

NSW

Readily Available

NSW

Availability - Further Information

Brown stringybark is mainly available in Victoria.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

10.40%

Radial:

5.10%

Unit Movement Tangential:

0.33%

Unit Movement Radial:

0.24%

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:

F17

F14

F11

F8

F7

Seasoned:

F27

F22

F17

F14

F11

Density per Standard

Seasoned:

840kg/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:

73

Modulus of Rupture - Seasoned:

126

Modulus of Elasticity - Unseasoned:

13

Modulus of Elasticity - Seasoned:

17

Maximum Crushing Strength - Unseasoned:

39

Maximum Crushing Strength - Seasoned:

70

Impact - Unseasoned:

15

Impact - Seasoned:

17

Toughness - Unseasoned:

Medium - 15 - 24 Nm

Toughness - Seasoned:

Medium - 15 - 24 Nm

Hardness - Unseasoned:

5.4

Hardness - Seasoned:

7.5

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:

Not Susceptible

Lyctid Borer Susceptibility - Other:

Termite Resistance:

Not Resistant

Fire Properties

Group Number - Other:

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

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications

Portal Frames

Timber portal frames are one of the most favoured structural applications for commercial and industrial buildings whose functions necessitate long spans and open interiors. As a material choice, timber offers designers simplicity, speed and economy in fabrication and erection.

Timber portal frames offer a strong, sound and superior structure. Structural action is achieved through rigid connections between column and rafter at the knees, and between the individual rafter members at the ridge. These rigid joints are generally constructed using nailed plywood gussets and on occasion, with steel gussets.

From material selection to finishing, this application guide provides a comprehensive overview of the process of using timber in the specification, fabrication and erection of portal frame structures.

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