Taun

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Taun comprises several members of the Pometia species occurring in low-lying coastal and riverine areas of Sri Lanka and South-East Asia, Papua New Guinea, the Solomon Islands and Samoa. Although the species can attain heights of up to 25 metres, an irregular bole and elliptical cross-section results in relatively short log lengths.

Taun heartwood varies in colour from pink to reddish-brown, darkening with age. Sapwood is a pale, pinkish buff, not always visually distinct from the true wood. The grain of taun timber is straight, with occasional interlocking, and of moderately coarse texture.    

Taun is a moderately durable hardwood, with an above ground life expectancy of between 15 and 40 years. Its in-ground life expectancy is considerably shorter, at between five and 15 years. Taun sapwood is susceptible to lyctid borer attack and is very difficult to impregnate with preservative. Taun is not termite-resistant.

Uses of taun in construction include general house framing, cladding, fascia boards, internal flooring, and plywood. Taun's properties also lend themselves to decorative applications such as lining, paneling, joinery, cabinetwork, outdoor furniture, carving, turnery and veneers. It is also used for boat building and cooperage.

Appearance

Taun heartwood varies in colour from pink to red-brown, darkening with age. Sapwood is a pale, pinkish buff, and not always visually distinct from the true wood. The grain of this timber is straight, occasionally interlocked and of moderately coarse texture.  

Common Applications

Uses of taun in construction include general house framing, cladding, fascia boards, internal flooring, and plywood. Taun's properties lend themselves to decorative applications such as lining, paneling, joinery, cabinetwork, outdoor furniture, carving, turnery and veneers. It is also used for boat building and cooperage.

Common Form

Sawn

Workability

Taun is moderately hard (rated 3 on a 6-class scale) in relation to indentation and ease of working with hand tools. The timber saws and turns easily with only a moderate blunting effect on cutting edges. It is readily bored and holds nails and screws well, can be satisfactorily bonded using standard gluing procedures, takes paints and stains well, and can be polished to a smooth, high finish. While taun is reasonably easy to work, sanding dust may be an irritant to mucous membranes.

Origin of Timber

Asia

Readily Available

NSW

Availability - Further Information

Small quantities of taun are imported into Australia.

Availability - Further Information

Plantation

Shrinkage

Very Low Low Medium High Very High

Tangential :

6.80%

Radial:

3.80%

Unit Movement Tangential:

0.27%

Unit Movement Radial:

0.19%

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:

F22

F17

F14

F11

F8

Density per Standard

Seasoned:

700kg/m3

Unseasoned:

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:

103

Modulus of Elasticity - Unseasoned:

12

Modulus of Elasticity - Seasoned:

15

Maximum Crushing Strength - Unseasoned:

33

Maximum Crushing Strength - Seasoned:

58

Impact - Unseasoned:

Impact - Seasoned:

Toughness - Unseasoned:

Low - up to 15 Nm

Toughness - Seasoned:

Medium - 15 - 24 Nm

Hardness - Unseasoned:

4.3

Hardness - Seasoned:

6.7

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 – Door and window joinery only

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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