Sydney Blue Gum (Eucalyptus saligna)

Sydney Blue Gum is an Australian native hardwood timber species that is widely used in general construction and for flooring, furniture and joinery.

Sydney Blue Gum is a large hardwood species growing to a height of 60 metres or more. It occurs natively in forests along the coast of New South Wales and southern Queensland. Sydney Blue Gum is also extensively grown as a plantation species in South Africa and South America, where rapid growth yields timber of much lower density than Australian material.

Sydney Blue Gum is an important general construction timber, particularly in New South Wales. It is widely used for flooring, cladding, fencing, paneling and boat building. Other common applications include landscaping (as garden sleepers), furniture and joinery.

The heartwood of the species ranges in colour from dark pink to a reddish brown. Sapwood is distinctly paler. The grain of Sydney Blue Gum timber is typically straight, with occasional interlocking of grain. Texture is moderately coarse and gum veins are common.

Sydney Blue Gum is a moderately durable timber with a life expectancy for in-ground applications of between eight and 15 years. Untreated sapwood is susceptible to Lyctid borer attack.

Sydney Blue Gum timber is easy to dry relative to most other eucalypts. It is also easy to work, dress and fix. It responds well to most finishes and takes a good polish, making it popular for decorative applications where moderate durability is required.

SHRINKAGE

  Very Low Low Medium High Very High
This is the measure of the percentage reduction in dimension from the unseasoned to 12% moisture content condition.
Tangential This is the measure of the percentage reduction
9.5
Radial
>5
Unit Movement
0.35%

STRENGTH GROUPS

  Very High High Reasonably High Medium High Medium Reasonably Low Low Very Low
Uneasoned
S1
S2
S3
S4
S5
S6
S7
Seasoned
SD1
SD2
S3
SD4
SD5
SD6
SD7
SD8

STRESS GRADE A stress grade is defined in AS 1720 as the classification of timber for structural purposes by means of either visual or machine grading. The stress grade indicates the basic working stresses and stiffnesses to be used for structural design purposes. Measured in MPa.

  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 density is based on moisture content of 12%. Unseasoned density is an approximation as it depends on the moisture content at the time of measurement. Measured kg/m3.

Unseasoned 1070kg/m3
Seasoned 850kg/m3

JOINT GROUP The joint group is a classification of the strength of a species in joint design. The values are from 1 (very high strength) to 6 (very low strength)

  Very High High Reasonably High Medium Low Very Low
Unseasoned
J1
J2
J3
J4
J5
J6
Seasoned
JD1
JD2
JD3
JD4
JD5
JD6

COLOUR The colour of seasoned heartwood can vary between species and often within a species. The information provided should be used as a general guide only. In most cases, the colour of sapwood is either a lighter shade of the heartwood or a white/cream colour

  White, Yellow,Pale Straw to Light Brown Pink to pink brown Light to dark red Brown, chocolate, mottled or streaky
Shade
 
   

MECHANICAL PROPERTIES

Modulus of Rupture – Unseasoned
91
Modulus of Rupture – Seasoned
140
Modulus of Elasticity – Unseasoned
16
Modulus of Elasticity – Seasoned
18
Maximum Crushing Strength – Unseasoned
44
Maximum Crushing Strength – Seasoned
68
Impact – Unseasoned
16
Impact – Seasoned
18
Toughness – Unseasoned
Medium – 15 – 25 Nm
Toughness – Seasoned
Medium – 15 – 25 Nm
Hardness – Unseasoned
6.4
Hardness – Seasoned
9
 
 

DURABILITY

  Low Moderate Reasonably High High
 
(0-5 years)
(5-15 years)
(15-25 years)
(> 25 years)
In Ground  
 
 
(0-7 years)
(7-15 years)
(15-40 years)
(>40 years)
Above Ground    
  (0-20 years, usually <5) (21-40 years) (41-64 years) (>65 years)
Marine Borer Resistance  
   
Lyctid Borer Susceptibility
Susceptible
Termite Resistance
Not Resistant

FIRE PROPERTIES

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
EFH Ignitability
                       
             
                                       
EFH Spread of Flame Index
1
2
3
4
5
6
7
8
9
10
                 
           
                                       
EFH Smoke Developed Index
1
2
3
4
5
6
7
8
9
10
   
             
                                       
Critical Radiance Flux – Lower
>2.2 and <4.5kWm 2
Critical Radiance Flux – Higher
>2.2 and <4.5kWm 2
Smoke Development Rating
<750
Fire Properties Group Number
1 – Non Combustible
2 – reasonably non combustible
3 – slightly combustible
4 – combustible
                   
         
                                       
Average Specific Extinction Area
<250
Bushfire Resistance
BAL 12.5, 19 and 29 – All AS3959 required applications
                                         

Botanical Name:

Eucalyptus saligna

Common Name:

Sydney Blue Gum

AKA:

Blue Gum

Type:

Hardwood

Appearance

The heartwood of this species ranges in colour from dark pink to reddish brown. The paler sapwood is readily distinguishable. Grain is typically straight with occasional interlocking. Texture is moderately coarse and gum veins are common.

Common Applications

Sydney Blue Gum timber is an important general construction timber, particularly in New South Wales. It is widely used for flooring, cladding, fencing, paneling and boat building. Other common applications include landscaping (as garden sleepers), furniture and joinery.

Common Form

Sawn

Workability

Sydney Blue Gum is easy to work, dress and fix. It responds well to most finishes and takes a good polish, making it popular for decorative applications where moderate durability is required.

External Cladding

The natural appeal, versatility and strength of timber makes it the superior choice for external cladding. Through specification, planning, design and finishing processes, timber cladding not only creates a building of superior strength, acoustic and thermal performance but also creates a place of beauty, style and natural appeal.

Fencing

When it comes to fencing, timber is your natural choice. A material that is durable, strong and reliable it compliments almost every outdoor landscape and environment. Clear specification, detailed installation and appropriate maintenance will see any timber fence provide a natural and lasting property boundary and back drop for years to come.

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.

Retaining Walls & Landscaping

When it comes to retaining wall, landscape design and construction, timber is the natural choice. A material that is durable, sturdy and reliable, it boasts natural aesthetics that help it blend seamlessly with the outdoors. Careful consideration during the specification and design process will facilitate the creation of a long lasting, durable and eye catching timber retaining wall that will complement its surrounding landscape for years to come.

Timber Joinery Products

Timber joinery products offer a classic, unique and stylish touch to any interior design.

Timber Portal Frames

For buildings that require large spans and column free interiors, timber portal frames provide one of the most aesthetically pleasing solutions. Utilising modern engineering technology, portal frame design transforms timber into a highly effective, efficient and economical structural product. This application guide provides a comprehensive overview of the process of using timber in the specification, fabrication and erection of portal frame structures.