Tasmanian Oak Properties
E.regnans, E.obliqua, E.delegatensis
For further information click tables marked
Availability & Appearance
Readily available and continuously harvested.
Available (multiple thicknesses)
Dressed seasoned timber 40 to 285mm wide by 12 to 40mm thick. Undressed seasoned timber 50 to 300mm wide by 19-50 mm thick. Lengths up to 5400mm long are available, with the bulk of production between 2700 and 4200mm long.
Straw to reddish brown with intermediate shades of cream to pink.
Grain is usually straight, open and even. Occasionally coarse-grained or fiddle backed. Growth rings are visible and usually conspicuous.
Uniform and smooth.
Density (per standard)
Class 3: 7-15 yrs
Class 4: 0-5 yrs
Susceptible to Lyctid Borer
Marine Borer Resistance
Native - Wet Eucalypt and Dry Eucalypt
35% of the total Tasmanian Oak forest types are reserved.
Chain of Custody
Average Specific Extinction Area
< 250 m2/kg
Critical Radiance Flux - Higher
> 2.2 < 4.5 kW/m2
Critical Radiance Flux - Lower
> 2.2 < 4.5 kW/m2
Smoke Development Rate
< 750% per min
EFH Ignitibility: 6
EFH Smoke-Develop Index: 3
EFH Spread-of-Flame Index: 5
Fire Properties Group Number: 3
Maximum Crushing Strength
Modulus of Elasticity (MOE)
Modulus of Rupture (MOR)
0.36% per 1% MC change
0.23% per 1% MC change
Common Structural Grades
Structural #3: F8
Structural #2: F17
S1:F14, S2:F11, S3:F8, S4:F7, S5:F5
S1:F22, S2:F17, S3:F14, S4:F11, S5:F8
S3 & S4
SD3 & SD4
Highly resilient and relatively easy to work.
A good to fair bending timber. 25mm material bends reasonably well to radius of 100mm.
Moderate. Can be severe in dense material.
Easy to drill. Holes are usually clean and to size.
Readily worked to a smooth, lustrous surface. Most finishes adhere very well. Stains very well.
Glues satisfactorily with most common adhesives.
Surfaces are true and clean, even-end grain. Holds edges well.
Pre-drilling is often necessary in seasoned or denser material. Nails hold well.
Moderate feeding force is required. Surfaces very smooth and lustrous when working 'with' the grain.
Rebating + Mortising
Generally produces excellent results.
Cuts fairly cleanly with moderate feeding force.
Turns well with sharp arrises.
Sources: Centre for Sustainable Architecture with Wood (CSAW), Wood Solutions