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NZ Building Code guide

🌏 Site Conditions — the plain-English guide

Wind zones, exposure (coastal), seismic, soil — drive fixings, framing, foundations. Free, plain-English NZ Building Code reference for builders — 7 topics.

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Wind Zones (L/M/H/VH/EH)A wind zone is the design wind pressure a building must resist on that site, classified Low → Extra High in NZS 3604.…
Exposure / Coastal ZonesExposure zones (NZS 3604 §4.2.3) grade how corrosive the air is at the site — mostly from airborne sea salt, and from…
Seismic Zones (1-4)How shaky a site is sets how much earthquake bracing a house needs. NZS 3604 simplifies New Zealand into earthquake…
Soil & Ground ConditionsNZS 3604's whole simple-foundations approach rests on one assumption: that you're building on "good ground" . If the…
NZS 3604 Soil Classes A-ENZS 3604:2011 §5.3.3 classifies sites into 5 subsoil classes — A (strongest) to E (weakest). The class drives bracing…
Geothermal Zone (Rotorua/Taupō)The geothermal belt through Rotorua, Taupō, and surrounding areas releases hydrogen sulphide (H₂S) gas that corrodes…
Toolie Site IntelSite Intel is Toolie's built-in shortcut for the four site factors that cascade through a whole quote. Type the job…

More of the NZ Building Code guide: Standards & Codes · Contracts & Compliance · Quality & Defects · Build Sequence · Materials · Structural · Linings & GIB · Weathertightness · Fire & Acoustic · Energy & H1 · Trades · Healthy Homes · Health & Safety · BRANZ Research · Pro Tips & Facts

Plain-English guide, not advice. This page helps you understand and navigate the rules — it is general information, not design, engineering or consent advice, and it does not reproduce the copyrighted tables of NZS 3604 or any Standard. Always check the current Standard or Acceptable Solution and your BCA, and use a suitably qualified LBP, engineer or QS where it matters.

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