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Timber

Silvertop Ash

Silvertop Ash is a class 2 durable hardwood. This means it has a natural durability of 15-40 years. It has many uses but is predominately sold as cladding or decking.

This wood has a medium texture with an interlocking grain and noticeable growth rings. As the word ‘Silver’ suggests, the timber of this species can be left to silver of to an aged patina look
and is reasonably easy to work with. Silvertop Ash is a very pale timber and accepts paint, stain and polish readily.

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Vertical Shiplap

Silvertop Ash

Factory coat of clear oil

Silvertop Ash is a wonderful cost effective hardwood with character.

Appearance

Silvertop ash has a narrow sapwood, which is not clearly distinguishable from the heartwood. Its heartwood is brown and sometimes pinkish in colour and often features the grain interlocked with growth rings.

With a medium texture, silvertop ash is also recognisable by the common occurrence of gum veins, the markings of pinhole borers and pencil streaks.

Common Applications

Silvertop ash is mainly used as a building timber, such as in timber framing, cladding and decking, It is often used for building framework on the south coast and tablelands of NSW. It is strong and reasonably durable, plus it has also been found to provide good fire resistance.

Other common applications include flooring, furniture and high-end joinery. Silvertop ash is also used for vehicle construction, handles, fence posts, amongst many other uses.

COMMON NAME
Silvertop Ash

LOOK & FEATURES
Moderately coarse & even texture, heavy, hard & compact

BOTANICAL NAME
Eucalyptus sieberi

COLOUR
White, yellow, pale straw to light brown.

COMMON USES
Cladding, flooring, decking, fencing.

Shrinkage
Tangential10.60%
Radial5.70%
Unit Movement Tangential0.36%
Unit Movement Radial0.25%
Strength Group
Unseasoned S3
SeasonedSD3
Stress Grade
UnseasonedF7/f8/F11/F14/F17
SeasonedF11/F14/F17/F22/F27
Density per Standard
Unseasoned850kg/m3
Seasoned1100kg/m3
Joint Group
UnseasonedJ2
SeasonedJD2
Mechanical Properties
Modulus of Rupture - Unseasoned78
Modulus of Rupture - Seasoned137
Modulus of Elasticity - Unseasoned13.2
Modulus of Elasticity - Seasoned17.3
Maximum Crushing Strength - Unseasoned41,6
Maximum Crushing Strength - Seasoned75
Impact - Unseasoned19.5
Impact - Seasoned20.3
Toughness - UnseasonedMedium - 15 - 24 Nm
Toughness - SeasonedMedium - 15 - 24 Nm
Hardness - Unseasoned6.7
Hardness - Seasoned9.7
Durability
In-Ground(5 - 15 yrs)
Above ground(15 - 40 yrs)
Marine Borer Resistance(0 - 20 yrs, usually < 5)
Lyctid Borer SusceptibilityNot Susceptible
Termite ResistanceNot Resistant
Fire Properties
EFH Spread-of-Flame Index6
EFH Smoke-Developed Index3
Critical Radiance Flux - Lower >2.2 and <4.5
Critical Radiance Flux - Higher>2.2 and <4.5
Smoke Development Rate<750
Average Specific Extinction Area<250
Bushfire ResistanceBushfire Attack Level (BAL) 12.5, 19 and 29 - All AS 3959 Required Applications

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