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Design wind speed

NCC
means the design gust wind speed for the area where the building is located, calculated in accordance with AS/NZS 1170.2 or AS 4055 (see Table 3 for wind classes).
Table 3 Wind classes

Non-cyclonic Region A and B

Cyclonic Region C and D

N1, N2, N3

C1

N4, N5, N6 (these wind classes are covered by Volume Two Part 3.0 , Structural provisions).

C2, C3, C4 (these wind classes are covered by Volume Two Part 3.0 , Structural provisions).

Notes:

  • 1. Wind classification map identifying wind regions is contained in Volume Two Part 3.0 (see Figure 3.0.1 ).
  • 2. Information on wind classes for particular areas may be available from the appropriate authority.
  • 3. “N” = non-cyclonic winds and “C” = cyclonic winds.
    • HB50
    <1> wind speed for use in design adjusted for annual probability of exceedance, wind direction, geographic position, surrounding environment and height
    For structures over 25 m, design wind speed is expressed as a function of height.
    <2> means the design gust wind speed for the area where the building is located, calculated in accordance with AS 1170.2, AS/NZS 1170.2 or AS 4055 (see Table 1.1.1 for Housing Provisions design wind speed descriptions and equivalent values)
    Source - BCA Vol 2 terminology