AS 1684.2:2021 Residential timber-framed construction, Part 2: Non-cyclonic areas
The objective of this Standard is to provide the building industry with procedures that can be used to determine building practice, to design or check construction details, and to determine member sizes, and bracing and fixing requirements, for timber-framed constructions in non-cyclonic areas.
The objectives of this revision are to —
(a) make editorial revisions and some technical changes to correct mistakes and clarify the application of the document;
(b) amend Section 5: Flooring and Decking to remove ambiguities and to reflect current research and experience which is able to provide for a quieter and more robust floor;
(c) amend Table 9.25 of AS1684.2 to include suitable nail and screw fixings for 45mm thick roof battens;
(d) reversing the values in Table 8.18 to represent JD5 capacities, while continuing to recognise JD4 capacities (an increase the values by 12.5%) where this is known;
(e) amend AS 1684.2 and AS 1684.3 to provide a suitable deemed-to-satisfy detail for metal tie down to timber connection that is compatible with AS 4773; and
(f) relaxing the notching requirements for non-load bearing walls.
This is Part 2 of a series of Standards for residential timber-framed construction. The Standards in the series are as follows:
AS 1684.1, Residential timber-framed construction, Part 1: Design criteria
AS 1684.2, Residential timber-framed construction, Part 2: Non-cyclonic areas
AS 1684.3, Residential timber-framed construction, Part 3: Cyclonic areas
AS 1684.4, Residential timber-framed construction, Part 4: Simplified — Non-cyclonic areas
While AS 1720.3-2016 Design Criteria for timber-framed residential building supersedes AS 1684.1:1999, notwithstanding this, AS 1684.1:1999 is not withdrawn as a standard, and remains relevant as the basis for Parts 2-4. AS 1684.4:2010 (derived from AS 1684.2:2010) remains current.
This Standard refers to Supplements that are an integral part of this Standard. Statements expressed in mandatory terms in Notes to the Span Tables in the Supplements are deemed to be requirements of this Standard.
Notes to the text contain information and guidance. They are not an integral part of the Standard.
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.
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 and within the limitations given in Clause 1.4. The provisions of this Standard also apply to alterations and additions to such buildings.
This Standard also provides building practice and procedures that assist in the correct specification and determination of timber members, bracing and connections, thereby minimizing the risk of creating an environment that may adversely affect the ultimate performance of the structure.
This Standard may also be applicable to the design and construction of other classes of buildings where the design criteria, loadings and other parameters applicable to those classes of building are within the limitations of this Standard.
NOTE 1: Refer to AS 1684.1 for details of design criteria, loadings and other parameters.
NOTE 2: While this Standard may be used to design Class 10 buildings, less conservative levels of design for this building class may be permitted by building regulations and other Australian Standards.
NOTE 3: Advisory information for the construction and specifications of timber stairs, handrails and balustrades is provided in FWPA’s Design Guide 8, see Bibliography.
Section 1: Scope and general
Section 2: Framing members
Section 3: Substructure
Section 4: Floor framing
Section 5: Flooring and decking
Section 6: Wall framing
Section 7: Roof framing
Section 8: Racking and shear forces (bracing)
Section 9: Fixings and tie-down design
Appendix A: (informative) Determination of roof mass
Appendix B: (informative) Durability
Appendix C: (normative) Interpolation
Appendix D: (informative) Examples — Foundation bearing area, distribution of bracing and shear force
Appendix E: (informative) Moisture content and shrinkage
Appendix F: (normative) Racking forces — Alternative procedure
Appendix G: (informative) Timber species and properties
Appendix H: (informative) Storage and handling
Appendix I: (normative) Collar ties with multiple rows of underpurlins
Appendix J: (informative) Building practices for engineered wood products (EWPs)
Timber Structures and Framing.
Australian Building Codes Board; Australian Forest Products Association; Australian Institute of Building Surveyors; Australian Timber Flooring Association; Engineers Australia; Forest and Wood Products Australia; Forest Industries Federation, WA; Frame&Truss Manufacturers Association of Australia; Glued Laminated Timber Association of Australia; Griffith University; Housing Industry Association; Housing SA; Institution of Fire Engineers; James Cook University; Master Builders Australia; Timber Development Association, NSW; Timber Queensland; University of Technology Sydney.