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Box, Coast Grey

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Coast grey box is a tough, highly durable large Australian hardwood. It grows in eastern Victoria and along the southern and central coast of New South Wales.

Its heartwood is a pale brown with the sapwood paler in appearance. It has a fine and even texture and usually features an interlocked grain. Gum veins are rarely present. It is similar in appearance to grey box, Eucalyptus moluccana.

Coast grey box is also a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. It is also satisfactory for steam bending.

Coast grey box is used for heavy construction, round timber and sleepers. Like Grey Box, it is mainly available in the areas it grows.

Appearance

Coast grey box features heartwood that is pale brown, sometimes with a tinge of pink. The sapwood is paler in appearance. It has a fine, even texture and usually features an interlocked grain. Gum veins are rarely present.

Coast grey box is very similar in appearance to grey box, Eucalyptus moluccana.

Common Applications

Tough and highly durable, Coast grey box is mainly used for heavy engineering construction and round timber. It is also used for sleepers.

Common Form

Sawn

Workability

Coast grey box is a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. Coast grey box is also satisfactory for steam bending.

Origin of Timber

NSW

Readily Available

NSW

Availability - Further Information

Coast Grey Box is mainly available in those areas in which it grows.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

8.20%

Radial:

3.90%

Unit Movement Tangential:

0.42%

Unit Movement Radial:

0.31%

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:

F22

F22

F17

F14

F11

Seasoned:

F34

F34

F27

F22

F17

Density per Standard

Seasoned:

1100kg/m3

Unseasoned:

1200kg/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:

101

Modulus of Rupture - Seasoned:

163

Modulus of Elasticity - Unseasoned:

17

Modulus of Elasticity - Seasoned:

20

Maximum Crushing Strength - Unseasoned:

53

Maximum Crushing Strength - Seasoned:

87

Impact - Unseasoned:

23

Impact - Seasoned:

26

Toughness - Unseasoned:

High - 25 Nm and above

Toughness - Seasoned:

High - 25 Nm and above

Hardness - Unseasoned:

10

Hardness - Seasoned:

13

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

0 1 2 3 4 5 6 7 8 9 10

EFH Spread-of-Flame Index:

EFH Smoke-Developed Index:

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

Structural Timber Poles

Timber pole construction is typically utilised to provide support for gravity loads and resistance against lateral forces. The natural appeal of timber ensures that its role is not purely structural however, with timber poles complimenting architectural designs aimed at harmonisation with the natural environment. The small number of footings required in pole frame construction also ensures minimal disturbances to the site.

With a double bearer system, poles can be spaced further apart than is usual, creating a more spacious building interior, that allows greater interior design flexibility. While poles are usually placed in a grid like system this is not compulsory and the flexibility of the application means the system can cope with a wide variety of designs, enabling designers to take full advantage of beautiful outlooks.

This article provides a comprehensive overview of the process involved in specifying, designing and constructing a solid timber pole construction.

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