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What Are The Australian Standards For Roof Trusses?

Roof-Trusses (1)

Roof trusses play a vital role in providing structural support and stability to roofs. In Australia, there are specific standards that govern the design, construction, and installation of roof trusses. These standards ensure that roof trusses are built to withstand various loads and environmental conditions. In this article, we will explore the key Australian standards for roof trusses.

AS 4440: Installation of Nailplated Timber Roof Trusses

AS 4440 is an Australian standard that outlines the requirements for the installation of nail plated timber roof trusses. This standard covers aspects such as the handling, storage, and erection of trusses. It provides guidelines for the safe and proper installation of roof trusses, including requirements for bracing, connections, and tie-downs.

AS 4440 also specifies the qualifications and competencies required for individuals involved in the installation of nailplated timber roof trusses. It ensures that only trained and skilled professionals carry out the installation process, reducing the risk of structural failures.

AS 1720.1: Timber Structures

AS 1720.1 is a comprehensive standard that covers the design and construction of timber structures, including roof trusses, in Australia. It provides guidance on the selection of timber, design principles, and load calculations for various types of timber structures.

When it comes to roof trusses, AS 1720.1 specifies the design requirements, including member sizes, connections, and bracing. It considers factors such as wind loads, snow loads, and other environmental conditions that can affect the performance of roof trusses. The standard also includes provisions for durability, fire resistance, and protection against termites.

AS 4440.2: Manufacturing of Timber Roof Trusses

AS 4440.2 focuses on the manufacturing of timber roof trusses. It provides guidelines for the fabrication process, including the selection of timber, truss design, and quality control measures. The standard ensures that roof trusses are manufactured in accordance with specified design requirements and are structurally sound.

AS 4440.2 covers various aspects of truss manufacturing, such as timber grading, plate fastening, and quality assurance procedures. It also emphasizes the importance of regular inspection and maintenance of manufacturing equipment to ensure consistent quality.

AS 1684: Residential Timber Framed Construction

AS 1684 is a series of standards that specifically focuses on the design and construction of timber-framed buildings, including residential structures. Part 3 of AS 1684 deals with the design of roof trusses in residential buildings.

This standard provides

This standard provides guidelines for the design of roof trusses, including span tables, member sizing, and load requirements. It ensures that roof trusses in residential buildings are designed to meet structural and safety standards.

AS 1684 also covers aspects such as bracing, tie-downs, and connections to ensure the overall stability and integrity of the roof truss system. It considers factors such as wind loads, snow loads, and other external forces that can impact the performance of roof trusses.

AS 3623: Domestic Metal Roofing

AS 3623 is an Australian standard that focuses on the design and installation of metal roofing systems in domestic buildings, including those supported by roof trusses. While it primarily deals with roofing materials, it also addresses aspects related to the support structure.

AS 3623 specifies requirements for the selection, design, and installation of metal roof coverings, flashings, and accessories. It provides guidance on the installation of metal roof cladding over roof trusses, ensuring proper attachment and compatibility with the truss system.


Compliance with Australian standards is crucial when it comes to roof trusses. These standards ensure that roof trusses are designed, manufactured, and installed to meet specific requirements, ensuring the safety and integrity of the overall roofing system.

From installation (AS 4440) to timber structures (AS 1720.1), manufacturing (AS 4440.2), residential construction (AS 1684), and metal roofing (AS 3623), these standards cover various aspects of roof truss design, construction, and installation.

It is important for builders, architects, and contractors to be aware of and adhere to these standards to ensure that roof trusses are built to withstand the loads and environmental conditions they will face. By following these standards, the industry can maintain high standards of quality, durability, and safety in roof truss systems across Australia.





Builders, engineers and designers alike all agree that floor trusses provide a simple solution to a variety of floor framing issues. For high-quality, strong, durable, noise-free flooring, trusses are the way to go. Want to know more? Contact us at Newcastle Frame and Truss or call on 0437 437 231.

We service Adamstown Heights, Birmingham Gardens, Bar Beach, Broadmeadow, Northern Sydney Newcastle, Callaghan, Hunter Regions, Black Hills, Wyong, Beresfield and surrounding areas.