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two-storey

Standards
construction with wall height, including any gable, not exceeding 8.5 m and including two trafficable floors
Source - AS 2870-2011: Residential slabs and footings
Standards
in any section through the house, construction that includes not more than two levels of timber-framed trafficable floor. trafficable floors in attics and lofts are included in the number of storeys
This requirement does not preclude the application of this Standard to up to a two-storey timber-framed construction supported—
  1. (a) by a bearer and joist substructure designed in accordance with this Standard; or
  2. (b) by lower levels of timber wall framing or other support systems designed in accordance with engineering principles and approved by the regulatory authority.
Spacing and span Bearers and joists Rafter Two supports Joint or sawcut over supports Continuous span

The design span is the average span unless one span is more than 10% longer than another, in which case the design span is the longest span.
Source - AS 1684.4-2010: Residential timber-framed construction
HB50
construction with wall height, excluding any gable, not exceeding 8.0 m and including two trafficable floors