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AS 1684.4-2010

[Available Superseded]

Residential timber-framed construction, Part 4: Simplified - Non-Cyclonic Areas

AS 1684.4 2010 specifies requirements for 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 construction in non-cyclonic wind classifications N1 and N2. Also referred to as the timber framing code.
Published: 21/06/2010
Pages: 194
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Companion documents
1.3 Normative references
1.4 Limitations
1.4.1 General
1.4.2 Wind classification
1.4.3 Plan
1.4.4 Number of storeys of timber framing
1.4.5 Width
1.4.6 Wall height
1.4.7 Rafter overhang
1.4.8 Roof pitch
1.4.9 Spacing Rafters or trusses Bracing
1.4.10 Roof types
1.4.11 Building masses
1.5 Design criteria
1.6 Load paths—Offsets and cantilevers
1.7 Durability
1.8 Dimensions
1.9 Bearing
1.10 Stress grades
1.11 Engineered timber products
1.12 Size tolerances
1.13 Alternative timber dimensions
1.14 Steel grade and corrosion protection
2 Terminology and definitions
2.1 General
2.2 Terminology of framing members
2.3 Vertical nail lamination
2.4 Stud lamination
2.5 Horizontal nail lamination—Wall plates only
2.6 Definitions
3 Substructure
3.1 General
3.2 Site preparation and drainage
3.3 Ground clearance and subfloor ventilation
3.4 Termite management
3.5 Substructure bracing
3.6 Subfloor supports
3.6.1 General
3.6.2 Footing classification
3.6.3 Stumps or posts Sizes Height Embedment
3.6.4 Footing type support limitations
4 Floor framing
4.1 General
4.1.1 Application
4.1.2 Materials
4.1.3 Framing configurations
4.1.4 Weatherproofing
4.1.5 Shrinkage
4.1.6 Cuts, holes and notches in bearers and joists
4.2 Building practice
4.2.1 Bearers General Fixing of bearers to supports Built-up bearers
4.2.2 Joists General Location of joists Deep joists Fixing of joists to bearers or lower wall plates External floors (decks, verandahs)
4.3 Member sizes
4.3.1 General
4.3.2 Bearers Bearers supporting loadbearing walls Bearers supporting floor loads only Single- or upper-storey bearers supporting loadbearing walls at right angles Single- or upper-storey bearers supporting roof point loads
4.3.3 Floor joists General Floor joists supporting non-loadbearing gable or skillion end walls Floor joists with loadbearing walls at right angles to joists Single- or upper-storey floor joists supporting roof point loads or loadbearing walls parallel to joists Openings in floors
5 Flooring and decking
5.1 General
5.2 Fitted floors (cut-in floors)
5.3 Expansion joints
5.4 Laying and fixing
5.4.1 Strip flooring Laying Fixing Fixing to structural plywood underlay
5.4.2 Structural plywood flooring Laying Fixing (See Figure 5.5)
5.4.3 Particleboard
5.5 Joist spacing—Flooring
5.6 Decking
6 Wall framing
6.1 General
6.1.1 Application
6.1.2 Bracing
6.2 Building practice
6.2.1 Studs Straightening of studs (crippling) Common studs Wall junctions Notching, trenching and holes in studs and plates Nogging
6.2.2 Wall plates General Bottom plates Stiffening of top plates Joints in top plates
6.2.3 Openings
6.2.4 Framing around chimneys and flues
6.2.5 Lateral support for non-loadbearing walls External walls Internal walls—(trussed roofs)
6.3 Member sizes
6.3.1 General
6.3.2 Wall studs Common studs Studs supporting concentrated loads Jamb studs (studs at sides of openings) Gable or skillion end wall studs Mullions Concentrated loads on non-loadbearing internal walls
6.3.3 Bottom plates
6.3.4 Top plates
6.3.5 Studs, plates and noggings in non-loadbearing internal walls
6.3.6 Lintels General Lintels in loadbearing walls Lintels in gable end walls Lintels in non-loadbearing walls Windowsill trimmers
6.3.7 Verandah beams (plates)
6.3.8 Verandah posts supporting roof loads
7 Roof framing
7.1 General
7.1.1 Application
7.1.2 Types of roofs and limitations General Coupled roofs Non-coupled roof Trussed roof
7.2 Building practice
7.2.1 Ceilings
7.2.2 Construction loads on ceiling framing
7.2.3 Ceiling battens
7.2.4 Ceiling joists General Splices and joints in coupled roof Connection to hanging beams Trimming around openings Platforms in roof spaces
7.2.5 Hanging beams General End support of hanging beams
7.2.6 Counter beams General Intersection of hanging and counter beams
7.2.7 combined strutting/hanging beams
7.2.8 Combined strutting/counter beams
7.2.9 Strutting beams
7.2.10 Underpurlins General Joints in underpurlins Cantilevered underpurlins Support of underpurlins
7.2.11 Rafters General Birdsmouthing
7.2.12 Ridgeboards General Joints in ridgeboards
7.2.13 Hip and valley rafters
7.2.14 Scotch valleys
7.2.15 Roof strutting Roof struts Tied and braced strut system Fan struts Opposing struts
7.2.16 Collar ties
7.2.17 Hip ends
7.2.18 Alternative support systems
7.2.19 Non-coupled roofs General Ridge and intermediate beams
7.2.20 Roof battens
7.2.21 Trussed roofs General Structural fascias Truss layout Support of trusses
7.2.22 Bracing for raftered and trussed roofs
7.2.23 Fixing of ceiling framing to internal bracing walls
7.2.24 Eaves construction General Boxed eaves
7.2.25 Gable or verge construction General Open gables Boxed gables
7.2.26 Lateral restraint of hanging, strutting, strutting/hanging beams, and similar members
7.2.27 Framing around chimneys and flues
7.3 Member sizes
7.3.1 General
7.3.2 Ceiling battens
7.3.3 Ceiling lining and non-trafficable roof decking General Tongued and grooved non-trafficable roof decking Structural plywood for non-trafficable roof decking
7.3.4 Loads on ceilings
7.3.5 Binders
7.3.6 Ceiling joists
7.3.7 Hanging beams
7.3.8 Counter beams
7.3.9 Combined strutting/hanging beams
7.3.10 Combined strutting/counter beams
7.3.11 Strutting beams
7.3.12 Underpurlins
7.3.13 Rafters and purlins General Rafter overhangs Birdsmouthed and non-birdsmouthed rafters Dressed rafters
7.3.14 Ridge or intermediate beams—Cathedral, skillion roofs, or similar roofs
7.3.15 Roof battens
7.3.16 Cantilevered gable ends
7.3.17 Other members/components
8 Bracing
8.1 General
8.2 Temporary bracing
8.3 Permanent bracing
8.3.1 Subfloor bracing General Full perimeter masonry base Diagonal bracing
8.3.2 Wall bracing General Procedure Rules and allowances Nominal wall bracing Structural wall bracing Distribution of bracing Connection at the bottom of bracing units Connection at the top of bracing units Bracing units under eaves
8.3.3 Roof bracing Pitched roofs (coupled and non-coupled roofs) Trussed roofs
9 Fixings and tie-down design
9.1 General
9.2 General connection requirements
9.2.1 General
9.2.2 Straps, bolts, screws, coach screws and framing anchors
9.2.3 Steel washers
9.2.4 Drilling for bolts
9.2.5 Drilling for coach screws
9.2.6 Screw and coach screw penetration
9.2.7 Framing anchor and strap nails
9.2.8 Joining of top plates
9.3 Procedure for determining fixing and tie-down requirements
9.4 Nominal and specific fixing requirements
9.5 Nominal fixings (minimum fixings)
9.6 Specific fixing (tie-down)
9.6.1 General
9.6.2 Rafter to ridge connection for sheet roof, N2 wind classification only
Appendix A
A1 General
A2 Floor and wall framing (External loadbearing walls)
A3 Floor and wall framing (Internal loadbearing walls)
A4 Substitution of seasoned timber member sizes
Appendix B
Appendix C
Appendix D
Cited references in this standard
Plywood - Structural, Part 0: Specifications
AS/NZS 1604
Specification for preservative treatment (all Parts)
Reconstituted wood-based panels — Specifications, Part 4: Wet process fibreboard
Particleboard Flooring, Part 1: Specifications
Building Code of Australia
Content history
DR AS 1684.4
Inclusive of GST
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