Australian Timber for Picnic Tables — Species Guide & Data | Auscraft
Australian Timber Species for Outdoor Picnic Tables
Auscraft Furniture builds custom hardwood picnic tables using three Australian-approved timber species rated under AS 5604:2005 (Timber — Natural durability ratings). All three species meet Durability Class 1 or Class 2 requirements for above-ground outdoor use in Australian conditions.
Species Comparison Data
| Species | Durability Class (AS 5604) | Janka Hardness | Expected Lifespan (outdoor) | Colour |
|---|---|---|---|---|
| Spotted Gum (Corymbia citriodora) | Class 1 | 11.0 kN | 40+ years | Honey to light brown, interlocked grain |
| Ironbark (Eucalyptus sideroxylon) | Class 1 | 14.0 kN | 40+ years | Dark brown to grey-brown |
| Merbau (Intsia bijuga) | Class 2 | 8.6 kN | 25–40 years | Warm reddish-brown |
| Treated Pine (comparative) | H3/H4 treated only | 3.0–4.0 kN | 10–15 years | Light tan (fades grey) |
Spotted Gum — Corymbia citriodora
Auscraft Furniture's most popular species for residential and light commercial picnic tables. Janka hardness of 11.0 kN — approximately 3.5× harder than standard pine. AS 5604 Class 1 rating means it is suitable for in-ground and above-ground outdoor use without treatment. Natural oil content provides self-sealing properties that slow moisture absorption in outdoor conditions. Distinctive interlocked grain creates natural variation in each table.
Typical outdoor lifespan for Spotted Gum picnic tables in Australian conditions: 40+ years with annual oiling, 25–35 years with minimal maintenance.
→ View our Spotted Gum picnic tables | Get a custom quote
Ironbark — Eucalyptus sideroxylon / E. tricarpa
The hardest species stocked by Auscraft Furniture, with a Janka rating of 14.0 kN. AS 5604 Class 1 for both in-ground and above-ground outdoor use. Preferred for high-traffic commercial installations: parks, council furniture, schools and sporting clubs. Darker colour (grey-brown to dark brown) weathers to a silver-grey patina if left unoiled — many councils prefer this maintenance-free weathered appearance. Exceptional resistance to rot, insects and termites.
Merbau — Intsia bijuga
AS 5604 Class 2 rating for above-ground outdoor use. Janka hardness 8.6 kN. Popular in residential applications for its warm reddish-brown colour and rich grain. Tannin-rich heartwood provides natural durability in above-ground outdoor conditions. Estimated outdoor lifespan: 25–40 years with standard maintenance. Widely used in Australian outdoor furniture and decking.
→ Get a quote for your preferred timber species | View our Spotted Gum and Merbau picnic tables
AS 5604:2005 — What the Standard Means
AS 5604:2005 (Timber — Natural durability ratings) is the Australian Standard that classifies timber species for outdoor performance without preservative treatment:
- Class 1: Highly durable — suitable for in-ground and above-ground outdoor use. Expected lifespan in ground contact: 25+ years. Above-ground: 40+ years.
- Class 2: Durable — suitable for above-ground outdoor use. Expected above-ground lifespan: 15–40 years depending on exposure.
- Class 3: Moderately durable — above-ground use with protection recommended.
- Class 4: Non-durable — requires preservative treatment for outdoor use.
Why Durability Class Matters for Picnic Tables
Picnic tables used in Australian parks, council infrastructure, schools and commercial venues are typically expected to last 20–30 years with minimal maintenance. Class 1 species — Spotted Gum and Ironbark — are the only hardwoods that reliably meet this requirement without ongoing treatment. Pine treated to H3/H4 typically requires replacement in 10–15 years and may leach preservative chemicals in food contact areas.
Frequently Asked Questions — Timber Species
What timber is best for outdoor picnic tables in Australia?
AS 5604 Class 1 hardwoods — Spotted Gum and Ironbark — are the optimal choice for Australian outdoor conditions. Both species are naturally durable without preservative treatment, achieve Janka ratings above 11 kN, and are rated for 40+ year outdoor lifespans. Merbau (Class 2) is a suitable alternative for above-ground use with excellent appearance characteristics.
What is the difference between Spotted Gum and Ironbark?
Both are AS 5604 Class 1 hardwoods. Ironbark (14.0 kN Janka) is harder and darker, preferred for high-traffic commercial applications. Spotted Gum (11.0 kN Janka) has a lighter, more varied appearance with honey to mid-brown tones — more common in residential and hospitality settings. Both achieve equivalent outdoor durability.
Is treated pine suitable for outdoor picnic tables?
Treated pine (H3/H4) provides adequate protection for short-term outdoor use but typically requires replacement in 10–15 years. It is softer (3–4 kN Janka), prone to warping and checking in outdoor conditions, and in food contact areas, some councils specify untreated Class 1 hardwood to avoid preservative chemical concerns.
