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The Acceptable Solution B1/AS1 now references NZS 3604:2011, the latest version of this Standard which replaces the 1999 version.
NZS 3604 is used to design most homes and other low-rise timber-framed buildings in New Zealand.
Standards New Zealand updated the Standard to align it with the loadings Standard AS/NZS 1170, particularly with regard to wind, earthquake and snow loads.
The limited technical review of the Standard was also aimed at reflecting current construction practices, and simplifying and clarifying the document.
For example, new diagrams clarify how to determine loaded dimensions and spans, while durability requirements have been clarified by new tables and diagrams describing exposure conditions.
NZS 3604:2011 is also aligned with the revised Acceptable Solution for weathertightness for timber-framed buildings, E2/AS1 (see article Changed External Moisture Documents).
There are important modifications. Changes made for the Canterbury Earthquake Region on 19 May 2011, requiring all slabs-on-ground to have reinforcing mesh which is tied to perimeter foundation reinforcing, now apply to all parts of the country. Unreinforced concrete slabs-on-ground are no longer an option anywhere (see article Changes to Concrete Slabs-on-Ground).
However, the amended definition of good ground for the Canterbury Earthquake Region , excluding ground subject to liquefaction or lateral spread, still only applies to that region.
Building officials and designers need to familiarise themselves with the changes throughout the new NZS 3604:2011, as well as the changes to Acceptable Solution
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