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Stringybark, Red

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Red stringybark is a medium-sized hardwood species native to southeast Australia. It features pale red or pinkish-brown heartwood, with cream-coloured sapwood approximately 50 millimetres wide. Red stringybark timber is close-textured. Interlocking of its grain often produces an attractive fiddleback figure.

Uses of this moderately durable timber range from light construction (fencing, framing, weatherboards, posts, poles) to engineering (sleepers, utility pole cross-arms, bridge and wharf construction). Red stringybark has also found favour as a cabinet timber in the manufacture of furniture and bench tops.

The timber of this species machines, routs, saws and sands well. It occasionally exhibits some natural feature and surface cracking. It is amenable to the use of standard fastenings and fittings. Due to the timber’s natural density, polyurethane glues are best for bonding red stringybark, The timber accepts most standard coatings, and responds particularly well to oil-based finishes.

Red stringybark timber products are not very common and supplies are usually limited.

 

Appearance

Red stringybark features pale red or pinkish-brown heartwood with a creamy sapwood approximately 50 millimetres wide. Its grain is close-textured, and interlocking often produces an attractive fiddleback figure.

 

Common Applications

Uses of this moderately durable timber range from light construction (fencing, framing, weatherboards, posts, poles) to engineering (sleepers, utility pole cross-arms, bridge and wharf construction). Red stringybark has also been successfully used as a cabinet timber in the manufacture of furniture and benchtops.

 

Common Form

Sawn

Workability

Red stringybark machines, routs, saws and sands well. The timber will occasionally exhibit some natural feature and surface cracking. It accepts standard fastenings and fittings. Polyurethane glues are best for bonding red stringybark, due to the timber’s natural density. The timber readily accepts most standard coatings, and particularly for cabinetmaking purposes, responds well to oil-based finishes.

 

Origin of Timber

NSW

Readily Available

NSW

Availability - Further Information

Red Stringybark timber products are also available in Victoria, however supplies are usually limited.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

9.80%

Radial:

5.70%

Unit Movement Tangential:

0.37%

Unit Movement Radial:

0.23%

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:

F22

F17

F14

F11

F8

Density per Standard

Seasoned:

860kg/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:

75

Modulus of Rupture - Seasoned:

116

Modulus of Elasticity - Unseasoned:

11

Modulus of Elasticity - Seasoned:

13

Maximum Crushing Strength - Unseasoned:

39

Maximum Crushing Strength - Seasoned:

65

Impact - Unseasoned:

13

Impact - Seasoned:

12

Toughness - Unseasoned:

Medium - 15 - 24 Nm

Toughness - Seasoned:

Medium - 15 - 24 Nm

Hardness - Unseasoned:

6.6

Hardness - Seasoned:

8.8

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

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

Joinery

Timber joinery products offer a classic, unique and stylish touch to any interior or exterior design. The products are produced for a variety of internal applications including door and window frames, cabinetry, skirtings, mouldings and architraves. When looking to the outdoors, joinery products range from decorative eaves and posts to eye-catching railings.

Many timber species are suitable for joinery products and care should be taken in selecting the perfect timber for the particular product and its intended finish. Rare and exotic species such as Teak and Rosewood can generate pieces of outstanding beauty but material cost and availability are also important considerations.

Commercially available species like Tasmanian oak, Australian cypress, spotted gum and the like, often make the more practical choice, with the added benefit that they can be easily matched with other timber products within the building, like flooring.

Solid timber for joinery products is generally supplied as ‘clear finish grade' but ‘paint grade' options are available and these are usually comprised of a composite material like MDF or glulam.

A large number of specialist suppliers and producers offer the consumer extensive choice of profiles for all of the most common and popular joinery products. Choice is in many cases, limited only by imagination.

Cabinetry is often associated with joinery and most typically includes, cupboards, benches and other similar ‘built in' furniture. Like joinery, cabinetry is generally specified as either paint or clear finish grade and naturally for clear finish grade timbers, appearance and surface finish are critical in achieving a successful application.

 

Fencing

The inherent appeal and strength of timber makes it the obvious choice for fencing. Timber fencing not only provides a natural look in keeping with the outdoor environment but it also enables the construction of a long lasting, durable property boundary. Fences come in many forms including the traditional paling, picket, post and railing styles. Most rely on a structural frame of posts embedded into the ground and two or more rails spanning between the posts. The ultimate selection of a suitable fence type or style is determined by application and aesthetics. A fence can serve a variety of purposes, including the provision of security, privacy and safety in addition to defining property boundaries. Specification for durability is important, especially for posts, given their exposure to high moisture in the ground.

This section provides an overview to best practice methods in specifying, installing and finishing a timber fence.

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