AS 1684.2:2021

This Standard specifies requirements for building practice and the selection, placement and fixing of the various structural elements used in the construction of timber-framed Class 1 and Class 10 buildings as defined by the National Construction Code. The provisions of this Standard also apply to alterations and additions to such buildings. This Standard is to be used in conjunction with the Supplements to this Standard.

AS 1684.2:2021 governs how residential buildings with timber frames are designed and constructed. The Standard aims to make these buildings safe, secure and durable. It does this by providing clear instructions on load-bearing capacity, structural integrity, and material usage.

The Standard states that timber-framed properties must be designed to withstand environmental loads (wind, snow, rain, thermal expansion), structural forces (dead loads, live loads, impact loads), and structural elements (beams, rafters, joists, foundations). 

Purchasing the AS 1684.2:2021 is a must for architects, designers, builders, and contracts involved in designing and erecting timber-framed structures. It ensures buildings are safe for people to live in, and that construction complies with local building code requirements and regulatory demands.

The AS 1684.2:2021 Standard also promotes:

• Better material usage: The Standard provides a full rundown of timber sizes, spacing, and connections, so structures are built efficiently and safely.


• Improved safety: The Standard ensures the timber framing system works and is structurally stable; improving safety for workers on site and reducing risk to homeowners and occupants thereafter


• Cost efficiency: The Standard promotes design and construction of the highest quality; reducing expensive repairs and amendments in the long term


• Better structural integrity: The Standard takes into account a range of forces and loads that are a risk to timber-framed homes; ensuring they are safe to work or live in


• Homeowner confidence: The Standard is industry-recognised, giving homeowners peace of mind that their homes are structurally sound

First published as AS O56-1946.
Second edition 1948.
Revised and redesignated as AS CA38-1971.
Revised and redesignated as AS 1684-1975.
Third edition 1992.
Revised and redesignated in part as AS 1684.2-1999.
Previous edition AS 1684.2-2010.
Fourth edition AS 1684.2:2021.
Reissued incorporating Amendment No 1 (June 2024).