Merbau doesn't just look beautiful — it performs. From its Class 1 durability rating to its natural resistance to termites and moisture, every characteristic of this remarkable timber makes it purpose-built for the Australian outdoors. When it comes to external hardwood, performance credentials matter — and Merbau consistently ranks among the highest-rated timbers across every key measure, making it the specification of choice for professionals across Australia.
Why we love Mebau!
| Durability Class | Treatment Level | Termite & Ant Resistance | Heat Resistance | Strength, Density, Hardness | Moisture Resistance |
| High | High | High | High | High | High |
| Class 1 | H Rating 4 -5 | Natural | Bal 29 | F Rating 11 - 14 Jenka rating 8.6 kN Density 830 kg/m³ | Natural |
| Above Ground for 50+ years. In ground rating of 25+ years. Exceptional resistance to decay. | Suitable for use in termite-prone areas. Rated highly for in-ground and structural applications in contact with the ground and fresh water. | Naturally resistant to termite & ant attack due to high oil content — critical for Australian outdoor structures. | Merbau is highly regarded for bushfire-prone areas, meaning it can withstand intense ember attack and moderate-to-high radiant heat. | Exceptionally hard, dense, stiff and stable. Resists denting, scratching and heavy foot traffic while delivering high load-bearing capacity. | Natural resin oils repel moisture, minimising swelling and shrinkage in wet or coastal environments |
What is Merbau?
Merbau (Intsia bijuga / Intsia palembanica) is a premium tropical hardwood sourced from the tropical forests of Southeast Asia and the Pacific. It has been a cornerstone of outdoor construction across Australia for decades — and for good reason.
Its deep reddish-brown heartwood, interlocked grain, and naturally occurring oils make it uniquely resistant to moisture, insects, and decay. This is a timber that thrives in the harsh Australian climate — coastal salt air, intense UV, and extreme heat included.
At Durable Hardwoods, we source Merbau through our extensive Australian and international mill network, ensuring every piece meets strict quality and sustainability standards.
Applications
Versatile. Dependable. Beautiful.
Merbau's combination of hardness, natural oils, and visual warmth makes it the go-to choice for architects, builders, councils, and landscapers across NSW, Queensland, Victoria, and South Australia.
Decking
Merbau is the benchmark for external decking in Australia. Its hardness resists heavy foot traffic, while its oils provide natural moisture protection, delivering a deck that stays beautiful for decades.
Cladding & Screening
The rich, warm tones of Merbau make it an architect favourite for external cladding and privacy screening. It weathers with character and handles UV exposure exceptionally well.
Fencing & Posts
Merbau fencing & Posts deliver strength and longevity in equal measure. Its Class 1 durability rating makes it suitable for exposed posts and palings in all Australian climate zones.
Landscaping & Retaining
From garden edging to retaining walls and planter boxes, Merbau performs under sustained soil contact and moisture — outlasting treated pine alternatives significantly.
Jetties, Bridges & Walkways
Merbau is widely specified for public boardwalks, bridges, and jetties & Piers — including Council and Government infrastructure — due to its structural strength and resistance to marine environments.
Pergolas & Structures
The high density and structural grade of Merbau make it ideal for pergolas, carports, and feature structures — combining load-bearing performance with natural aesthetic appeal.
Species Characteristics
Understanding what makes Merbau perform so well starts with the timber itself. Here's a closer look at the species characteristics that make it one of Australia's most trusted choices for external hardwood applications.
Merbau timber profile
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