{{ propApi.closeIcon }}
Our industry
Our industry $vuetify.icons.faArrowRight
Economic research and forecasting Economics Housing outlook Tailored market research Economic reports and data Inspiring Australia's building professionals HOUSING The only place to get your industry news Newsroom
Business support
Business support $vuetify.icons.faArrowRight
Become an apprentice host Hire an apprentice Why host an HIA apprentice? Apprentice partner program Builder and manufacturer program Industry insurance Construction legal expenses insurance Construction works insurance Home warranty insurance Tradies and tool insurance Paperwork gone digital Contracts Online HIA Tradepass HR Docs SafeScan - managing workplace safety Planning and safety services Building and planning services How can HIA Safety help you? Independent site inspections Trusted legal support Legal advice and guidance Professional services Industrial relations
Resources & advice
Resources & advice $vuetify.icons.faArrowRight
Building it right Building codes Australian standards Getting it right on site See all Building materials and products Concrete, bricks and walls Getting products approved Use the right products for the job See all Managing your business Dealing with contracts Handling disputes Managing your employees See all Managing your safety Falls from heights Safety rules Working with silica See all Building your business Growing your business Maintaining your business See all Other subjects COVID-19 Getting approval to build Sustainable homes
Careers & learning
Careers & learning $vuetify.icons.faArrowRight
A rewarding career Become an apprentice Apprenticeships on offer Hear what our apprentices say Advice for parents and guardians Study with us Find a course Get your builder's licence Qualifications Learn with HIA
HIA community
HIA community $vuetify.icons.faArrowRight
Join HIA Sign me up How do I become a member? What's in it for me? Get involved Become an award judge Join a committee Partner with us Get to know us Our members Our people Our partners Mates Rates What we do Mental health program Charitable Foundation GreenSmart
Awards & events
Awards & events $vuetify.icons.faArrowRight
Awards Australian Housing Awards Awards program National Conference Industry networking Events
HIA products
HIA products $vuetify.icons.faArrowRight
Shop @ HIA Products Digital Australian Standards Contracts Online Shipping and delivery Purchasing terms & conditions
About Contact Newsroom
$vuetify.icons.faTimes
$vuetify.icons.faMapMarker Set my location Use the field below to update your location
Address
Change location
{{propApi.title}}
{{propApi.text}} {{region}} Change location
{{propApi.title}}
{{propApi.successMessage}} {{region}} Change location

$vuetify.icons.faPhone1300 650 620

Using AS 1684 for timber framing

How should AS 1684 Residential Timber Framed Construction be interpreted for installation of residential timber – and which part of the Standard suits your needs?

AS 1684 – Four parts

AS 1684 Residential Timber Framed Construction has four parts: 

  • Part 1 relates to design criteria that can be used as a basis for the preparation of span tables and design data for the other parts. This is the document commonly used by engineers 
  • The other three parts provide building practices and procedures that assist in the correct specification and determination of timber members, bracing and connections. Part 2 and 4 are used in non-cyclonic areas and Part 3 is designed for the cyclonic areas of northern Australia. Part 4 is referred to as the ‘Simplified’ version.

As the name suggests, Part 4 being the ‘simplified’ version was developed as a more user-friendly document than Part 2. But there are differences between the two Standards that users must be aware of that places limitations on the simplified version.

The criteria in both versions are specifically for conventional timber-framed buildings of one or two storeys.

Part 4 can only be used in the two lower wind classifications of N1 and N2 where Part 2 covers wind classifications up to N4.

The maximum width of a building designed under Part 4 is 12m where Part 2 can be used for building widths up to 16m and maximum external wall heights are 2.7m and 3m respectively.

There is a limit placed on the maximum roof pitch in both documents of 30 degrees for Part 4 and 35 degrees for Part 2.

To assess the amount of bracing a building requires under Part 4 only requires four steps, the bracing units are expressed as type A or type B and a simple table will indicate how many units are required.

Part 2 is a lot more complex in relation to bracing calculation and requires the raking forces to be determined and the calculation of bracing expressed in kilo Newtons per metre designed to counter that force.

The simplified version is popular for its hard copy span tables and minimal information is required to determined spans. Part 2 has supplementary span tables on CD that requires more input to calculate timber sizes but delivers more choice.

The disadvantage of using Part 4 is that it generally over-engineers building components, the span tables are less comprehensive and can be less economical to use than Part 2, so this should be considered when deciding which part to adopt. 

To find out more, contact HIA’s Building Services team.

Email us

Share with your network:

More articles on:

{{ tag.label }} {{ tag.label }} $vuetify.icons.faTimes
Find guides, how-tos, resources and more

Business support


 

Supporting building professionals with custom built services and products.

  • Legal support
  • Contracts Online
  • Host an HIA apprentice
  • Insurance services
  • Managing safety

Explore Business support

Building it right topics


 

Can’t find what you need, check out other resources that might be closer to the mark.