Ash, Victorian | E. delegatensis & E. regnans

Victorian ash the trade name of two large Australian hardwoods that can be used for timber framing, internal applications and furniture.

Other Names: Alpine Ash, Tasmanian Oak, Mountain Ash, Gum-topped Stringybark, White-top, Blue-leaf

Overview

Victorian ash is the trade name for two of the tallest hardwood species in the world. This Australian hardwood takes its name from the fact that it grows in the alpine areas of Victoria, Tasmania and New South Wales. It can refer to either mountain ash or alpine ash and is marketed under the trade names Tasmanian oak or Victorian ash, although it is important to note that the proportions of each species can vary considerably.

Victorian Ash is mainly available in Victoria, Tasmania and NSW, with limited availability to other parts of Australia.

Victorian ash timber usually has a straight grain but may also produce fiddleback markings and have visible gum veins. It has a course texture. The heartwood ranges from pale pink to yellowish brown and a walnut colour can be achieved by steaming with ammonia. The heartwood is often indistinguishable in colour from the softwood. Care needs to be taken when drying Victorian ash because of its proneness to collapse and internal checking, as well as surface checking on the tangential surface. There is minimal shrinkage after drying. To ensure good quality boards, logs are quarter-cut, which provides excellent dimensional stability. Reconditioning is standard practice.

While Victorian ash can be used for general construction, such as framing, its low to moderate durability means it is best suited for interior applications such as flooring, paneling, high value joinery and furniture. Victorian ash is also used to manufacture plywood and may also be used for boxes, crates and paper pulp. Victorian ash is grown as a plantation timber due to its quick growth and resistance to insect attack.

Properties

Shrinkage

Very Low Low Medium High Very High
Tangential:          
8.5
Radial: > 5
Unit Movement: 0.35 %

Strength Group

Very High High Reasonably High Medium High Medium Reasonably Low Low Very Low
Unseasoned:S1S2S3S4S5S6S7
Seasoned:SD1SD2SD3SD4SD5SD6SD7SD8

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

Unseasoned: 1050 kg/m3
Seasoned: 660 kg/m3

Joint Group

Very High High Reasonably High Medium Low Very Low
Unseasoned:J1J2J3J4J5J6
Seasoned:JD1JD2JD3JD4JD5JD6

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: 63
Modulus of Rupture - Seasoned: 110
Modulus of Elasticity - Unseasoned: 11
Modulus of Elasticity - Seasoned: 15
Maximum Crushing Strength - Unseasoned: 33
Maximum Crushing Strength - Seasoned: 60
Impact - Unseasoned: 13
Impact - Seasoned: 18
Toughness - Unseasoned: Medium - 15 - 25 Nm
Toughness - Seasoned: Medium - 15 - 25 Nm
Hardness - Unseasoned: 4.0
Hardness - Seasoned: 4.9

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 - Other: S – Tas, NSW   NS – Vic
Termite Resistance: Not Resistant

Fire Properties

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
EFH Ignitibility:
0 1 2 3 4 5 6 7 8 9 10
EFH Spread-of-Flame Index:
EFH Smoke-Developed Index:
Critical Radiance Flux - Lower: >2.2 and <4.5 kW/m2
Critical Radiance Flux - Higher: >2.2 and <4.5 kW/m2
Smoke Development Rate: <750
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 – Door and window joinery only

Description

Botanical Name: E. delegatensis & E. regnans
Preferred Common Name: Ash, Victorian
Other Names: Alpine Ash, Tasmanian Oak, Mountain Ash, Gum-topped Stringybark, White-top, Blue-leaf
Species Type: Hardwood

Appearance

Victorian ash timber can range from a pale pink to pale yellow or brownish colour. The heartwood and sapwood colours are generally quite hard to tell apart, with sapwood 25 to 50mm wide. Victorian ash features a moderately course texture and has a predominately straight grain, although it may be wavy in parts resulting in a fiddleback appearance. Gum veins are also a common appearance feature. It will provide a light, creamy-coloured timber for appearance applications, although a richer walnut colour can also be achieved by steaming Victorian ash with ammonia.  

Common Applications

Victorian ash can be used for protected structural applications, such as timber framing, but it is best suited to indoor applications and furniture due its low to moderate durability. Flooring, paneling and high value joinery are some of its more common applications, although it is also used for agricultural implements, oars, cooperage, boxes, crates, paper pulp and in the manufacture of plywood.

Workability

A strong and stable timber, Victorian ash offers good all round workability. It planes, sands, finishes and glues well, and will readily steam and bend. This makes Victorian ash an ideal timber for internal applications and furniture.

Origin of Timber

NSW, VIC, TAS

Availability - Further Information

Victorian ash is predominantly available in the states that it grows, being Victoria, New South Wales and Tasmania. The timber is often sold to other states mixed with mountain ash and messmate under the trade name Tasmanian oak.

Source of Timber

Native Forest

Applications

  • 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.

  • Interior Stairs

    Timber should be the material of choice for designers seeking internal staircases of strength, beauty and durability. The construction procedure described here applies to most general type stairs of either conventional or contemporary construction.

  • Internal Paneling

    Timber paneling creates interiors as warm as they are stylish. Commonly using an MDF or plywood substrate, internal timber paneling is natural and versatile and comes as either solid natural timber panels or as sheets of engineered wood products

  • Timber Joinery Products

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

  • Timber Mouldings

    Mouldings are extremely versatile and durable, enhancing the aesthetics of any interior and functioning as the icing on the cake for designs with a focus on beauty and splendour.

  • 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.

Case Studies

  • Abigroup House, Brisbane

    Abigroup House, Brisbane Cox Rayner Architects have created an interior that presents Abigroup as a forward-thinking building company, and timber is a highly visible contribution to this effect.

    Applications: Doors, Flooring, Interior Rails and Balustrades, Interior Stairs, Internal Paneling,

  • Lewis St House, Thornbury

    A stunning residential renovation and addition that uses timber and timber products throughout with a commitment to sustainable design.

    Applications: Architectural Roof Trusses, Doors, External Cladding, Flooring, Framing, Interior Stairs, Windows,

  • National Portrait Gallery, Canberra

    Jarrah, Spotted Gum, Blackbutt and Victorian Ash play an essential role in the National Portrait Gallery’s expression of Australian identity.

    Applications: Architectural Roof Trusses, External Cladding, Flooring, Framing, Interior Stairs, Internal Paneling, Windows,

  • Svarmisk Resort Centre, Mt Beauty

    A striking eco-resort that embodies the essence of new and recycled timber working together to form a unique, innovative and sustainable development.

    Applications: External Cladding, Flooring, Framing, Interior Rails and Balustrades, Interior Stairs, Internal Paneling, Pergolas, Shear walls, Structural Timber Poles,

  • The Solar Observatory

    A full scale building project designed and constructed by Monash University Architecture students for observation and engagement with specific light conditions.

    Applications: Framing, Internal Paneling, Structural Timber Poles, Timber Portal Frames,

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