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    AS/NZS 1170 — Structural Design Actions


    AS/NZS 1170 is the standard for the loads (actions) a structure must be designed to resist — permanent, imposed, wind, snow and earthquake. For housing, its wind part sits behind the simpler AS 4055 wind classification.

    2 August 20263 min readAdam Gates · QBCC Lic. 1318443 · Building Inspector · Verify on QBCC
    On-site building inspection photo from a VG Inspect AS/NZS 1170 job in SEQ
    On-site building inspection photo from a VG Inspect AS/NZS 1170 job in SEQ

    AS/NZS 1170 is the engineer's loads standard — the rulebook for the forces a building has to withstand. For a house, you meet it mostly through the wind classification it underpins.

    What AS/NZS 1170 actually means

    AS/NZS 1170 sets out the design actions — the loads — that structures must resist: permanent (dead) loads, imposed (live) loads, wind, snow and earthquake. Each is covered in a part of the series. Part 2 deals with wind actions, and it is the basis for the housing-specific wind classifications in AS 4055.

    Where it applies in your new home

    Every structural element of your home is designed to carry the loads AS/NZS 1170 defines. For most houses this reaches you indirectly, through the engineer's design and — for wind — through the AS 4055 wind class assigned to your site.

    What VG Inspect checks against it

    An inspector does not re-derive the loads; that is engineering. What is verified on site is that the built structure matches the engineered design that accounts for those loads — particularly the wind-related bracing and tie-down at frame stage, where the consequences of getting it wrong are greatest.

    What it does and doesn't cover

    AS/NZS 1170 covers the loads. How the frame is built to resist them is covered by AS 1684 (timber) or the NASH Standard (steel), and the wind class by AS 4055.

    A VG Inspect QBCC-licensed inspector (QBCC Licence 1318443) verifies your frame against its engineered design at frame stage. Call 07 3180 8041 or book a frame inspection online.

    Frequently Asked Questions

    How is AS/NZS 1170 different from AS 4055?

    AS/NZS 1170 is the general structural-loads standard used by engineers for all kinds of structures; its Part 2 covers wind actions. AS 4055 is a simplified, housing-specific route that turns those wind principles into a straightforward N1-N6 / C1-C4 classification a home can be designed to. For most houses, AS 4055 is the practical tool built on the AS/NZS 1170 foundation.

    Ready to book?

    From $660 · Same week availability. A VG Inspect QBCC-licensed inspector attends every inspection across Brisbane and SEQ. QBCC Lic. 1318443.

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