AS 1684 is the Australian Standard that governs how timber-framed homes are built. It is the rulebook behind the frame stage of construction — the point at which the structural skeleton of your home is assembled, and the last moment most of it can be easily inspected.
What AS 1684 actually means
AS 1684 provides the engineering basis for residential timber framing. It specifies how each structural member should be sized and graded, how members should be spaced, how openings such as doors and windows should be framed with appropriate lintels, and how the whole assembly should be braced and tied down. The standard accounts for the loads a home carries — its own weight, the weight of occupants and contents, and the wind forces of its location.
In Queensland, wind classification matters a great deal. AS 1684 includes span tables and bracing and tie-down requirements that scale with wind category, so a home in a higher wind area needs more robust connections than one in a sheltered location.
Where it applies in your new home
AS 1684 applies throughout the timber structure: the wall frames, the floor framing where timber floors are used, and the roof framing including rafters, trusses' bearing points and the connections between them. It governs the studs and plates in your walls, the lintels over every window and door, the bracing panels that stop the building racking sideways, and the tie-down chain that holds the roof down.
What VG Inspect checks against AS 1684
A frame inspection is carried out after the frame is erected but before it is lined and clad. At this stage an inspector can verify member sizes and spacings against the relevant span tables, confirm lintels are correctly sized for their openings, check that bracing is installed and fixed as required, and follow the tie-down load path from roof to footing to confirm it is continuous.
Fixing details matter as much as the members themselves — the right strap, bolt or bracket, installed with the correct number of fixings in the correct positions. All of this is documented in writing with photographs while it is still visible.
What can go wrong
Common issues found at frame stage include undersized or notched members, missing or incomplete bracing, lintels that are not adequate for their span, and gaps in the tie-down chain where a strap or connection has been omitted. Individually small, these items can undermine the structural performance the standard is designed to guarantee.
The difficulty is timing. Once plasterboard and cladding go on, these elements are concealed. Verifying them later may mean opening up finished surfaces, which is invasive and costly.
What AS 1684 does and doesn't cover
AS 1684 covers timber-framed construction within defined limits of building size, geometry and wind classification. Homes that fall outside those limits — unusually large spans, complex shapes or high wind exposure — require specific engineering design rather than the standard's span tables. AS 1684 also does not cover steel framing, which is verified against its own standards.
A VG Inspect QBCC-licensed inspector (QBCC Licence 1318443) attends every frame inspection personally, working alongside your builder to confirm the structure is right before it is covered. Call 07 3180 8041 or book a frame inspection online.