Chemical preservation of round and sawn timber Amendment 5 to NZS 3640 published

sawn timber

Issue 46 – February 2013

Standards New Zealand recently published Amendment 5 to NZS 3640:2003 Chemical preservation of round and sawn timber. It provides for:

  • the assessment and approval where appropriate of applications for the inclusion of new treatment chemicals. A wider range of timber treatments is now available

  • aligns the classification of existing treatments to the Ministry of Business, Innovation and Employment New Zealand Building Code Acceptable Solution for timber durability, B2/AS1, Amendment 7.

NZS 3640 sets out requirements for the preservative treatment and identification of timber to provide protection from decay and insect attack including marine borers in all likely exposure conditions throughout New Zealand, based on six hazard classes that are described in the Standard.

The Standard is used by timber treatment suppliers and treatment plants.


Published in building.

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