Sept 1995 NZS 3602 amended to allow for kiln-dried untreated timber (KDUT) provided in situ moisture range is 18% or less (alternative solution at this stage).
Dec 2003 NZS 3640 amended to include the new levels of timber treatment - H1.1, H1.2, H3.1, H3.2
April 2004 Part 1 of NZS 3602: 2003 'Mandatory Requirements for Compliance with the Durability Provisions of Clause B2 of the New Zealand Building Code' becomes an Acceptable Solution after being referenced in B2/AS1. (Cavity system)The previous Acceptable Solution, Part 1 of NZS 3602: 1995 (which allowed KDUT), continues to apply as an Acceptable Solution until 31 March 2005.