Product Range

Structural Timber

Australian hardwood structural timber supplied for residential, commercial, industrial and infrastructure applications requiring strength, durability and long-term performance.
Australian Hardwood

Sourced and milled for structural, industrial and infrastructure applications.

Structural Grades

Available in nominated structural grades including F14, F17 and F27.

Treatment Options

Supplied treated for durability and external service conditions.

Built for Performance

Suitable for structural, civil, industrial and exposed outdoor applications.

Our Structural Timber Range

DTM Timber supplies a range of Australian hardwood structural timber products prepared for residential, commercial, industrial and infrastructure applications. Products are available in both seasoned and unseasoned conditions depending on structural requirements, application needs and intended finish.

Structural timber is available in nominated F-grades including F14, F17 and F27, with products supplied for both general structural use and exposed structural appearance applications.

All products are supplied treated using recognised preservative systems including CCA and TAN-E for durability and external service conditions.

Unseasoned Structural Timber (F14 / F17)

Unseasoned structural hardwood is supplied in the green state for structural applications where drying in service is accommodated through design and installation practices. It is commonly selected for applications requiring larger section sizes, structural durability and reliable load-bearing performance under demanding service conditions.

DTM Timber supplies unseasoned hardwood structural timber in nominated structural grades including F14 and F17, depending on species, section size and application requirements. These grades are commonly specified for structural framing, support members and outdoor applications where strength and durability are more important than finished appearance.

Unseasoned structural hardwood is regularly used in subfloor construction, deck framing, posts, bearers, joists and civil applications where timber is exposed to varying environmental conditions and long-term structural performance is required.

Products are treated to support durability in external and structural service conditions.

Common Applications
Key Features
  • Bearers and joists
  • Posts and columns
  • Deck framing
  • Subfloor construction
  • Outdoor structures
  • Civil and infrastructure projects
  • Supplied unseasoned (green)
  • Available in F14 and F17 structural grades
  • Suitable for heavy structural applications
  • Treated using CCA or TAN-E
  • Available in a range of section sizes and lengths

Allowance should be made for natural shrinkage and movement as the timber dries in service. Correct detailing, fixing and ventilation practices are important for long-term performance.

Seasoned Structural Timber (F27)

Seasoned structural hardwood is supplied with reduced moisture content to improve stability in service, minimise movement and provide a more consistent finished product. DTM Timber supplies seasoned structural timber in F27 grade for demanding structural applications requiring higher engineering performance.

F27 structural hardwood is commonly selected where increased strength, stiffness and span capability are important, particularly in structural framing, floor systems and support applications. These products are typically used where structural performance is the primary requirement and the timber may be enclosed, lined or otherwise not intended as a finished visual feature.

Compared with lower structural grades, F27 hardwood provides higher engineering performance for applications requiring greater load capacity and improved structural efficiency. Seasoning also assists in reducing shrinkage, movement and moisture-related distortion after installation.

Treatment is applied where required to support durability, service life and external exposure.

Common Applications
Key Features
  • Residential framing
  • Commercial framing
  • Structural support members
  • Floor systems
  • Roof structures
  • Heavy structural applications
  • F27 structural grade
  • Seasoned for improved stability
  • Reduced shrinkage and movement
  • Higher strength and stiffness
  • Treated using TAN-E

Seasoned structural timber is primarily selected for structural performance rather than finished appearance.

Natural marks and surface variation typical of structural hardwood products may still be present.

Structural Appearance
Seasoned Structural Appearance Timber

Seasoned structural appearance hardwood is supplied for applications where both structural capability and finished presentation are important. Products are seasoned to improve stability in service and reduce movement while maintaining structural performance for exposed applications.

Unlike standard structural timber selected primarily for engineering performance, structural appearance timber is prepared with greater consideration given to visible surface quality, presentation and overall finished appearance. These products are commonly used where the timber remains exposed after installation and forms part of the finished architectural result.

Structural appearance hardwood is commonly selected for exposed beams, pergolas, verandahs, pavilions, feature posts and architectural outdoor structures where natural hardwood appearance and structural performance are both important design considerations.

Treatment supports exposed external use while maintaining the intended finished appearance.

Common Applications
Key Features
  • Exposed beams and rafters
  • Pergolas and pavilions
  • Verandahs and outdoor structures
  • Feature timber posts
  • Architectural timber applications
  • Exposed deck structures
  • Structural hardwood for exposed applications
  • Improved visual presentation
  • Seasoned for greater stability
  • Reduced surface checking and movement
  • Treated using TAN-E

Natural timber variation remains a feature of Australian hardwood products and should be expected as part of the finished appearance.

OUR STRUCTURAL SPECIES

Each hardwood species offers unique characteristics to suit a range of structural applications

SPOTTED GUM

Spotted Gum is a premium Australian hardwood recognised for its high strength, durability and versatility. It is commonly used in structural applications where performance, reliability and long-term service life are required.

Best suited for:

  • Structural timber applications
  • Posts and beams
  • Residential and commercial construction
  • Outdoor structures
  • Infrastructure projects
IRONBARK (Grey/Red)

Ironbark is one of Australia’s most durable and highest-strength hardwood species. Renowned for its exceptional density, toughness and long service life, Ironbark is widely used in demanding structural, engineering and infrastructure applications where durability and performance are critical.

Best suited for:

  • Heavy structural applications
  • Posts, beams and columns
  • Bridges and civil infrastructure
  • Commercial and industrial projects
  • High-load and high-wear environments
DARWIN STRINGYBARK

Darwin Stringybark is a durable northern Australian hardwood valued for its strength, stability and reliable structural performance. Its combination of durability and workability makes it suitable for a wide range of construction, structural and outdoor applications.

Best suited for:

  • Structural framing and support members
  • Posts, beams and outdoor structures
  • Residential and commercial construction
  • Landscaping and external applications
  • General building projects
MIXED TIMBERS

Specialty and Mixed Hardwoods encompass a range of Australian timber species selected to meet specific structural, architectural and project requirements. Species selection may vary depending on availability, performance requirements and intended end use, providing flexible solutions across a broad range of applications.

Best suited for:

  • Specialised structural applications
  • Architectural and feature projects
  • Custom construction requirements
  • Commercial and infrastructure projects
  • Project-specific timber solutions
  • Applications
Structural hardwood timber is commonly used across a wide range of residential, commercial, industrial and infrastructure applications where strength, durability and long-term structural performance are required, including:
  • Residential construction
  • Commercial construction
  • Deck and subfloor framing
  • Outdoor structures
  • Civil and infrastructure projects
  • Industrial and agricultural applications
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  • Grades Explained

Our structural hardwood is Visually Stress Graded in accordance with AS 2082.

Grade Typical Use
F14 General structural applications where reliable performance is required.
F17 Higher strength applications requiring greater capacity, stiffness and span.
F27 Higher-strength seasoned hardwood for demanding structural applications.
Other grades may be available on request.
  • Key Information
  • Treatment Systems

Products supplied treated using recognised systems including CCA and TAN-E.

  • Moisture Content
Available seasoned or unseasoned depending on structural and application requirements.
  • Structural Standards
Structural hardwood visually stress graded in accordance with applicable Australian Standards including AS 2082.
  • Sizes & Availability
Available in a range of section sizes and lengths subject to species and availability.
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