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Standards and Guidelines

Tree Care Guidelines

The three following Guideline documents produced by NZ Arb are currently under review; Trees on Development Sites, Tree Protection Fencing, Amenity Tree Pruning Guide. These guidelines are being contextualised for NZ conditions and regulations.

NZ Arb would like to thank all of those who had input into these draft documents and those involved in the review process, in particular, Gavin Donaldson, Rob Graham, Tim Errington and the members of the Auckland Regional Consents Arborist Forum.

In the absence of NZ specific standards, The New Zealand Arboricultural Association supports and recommends the use of the following international standards:

Tree Pruning:
              

Australian Standard:
               AS 4373 - 2007 Pruning of amenity trees

               The British Standard:      
               BS 3998: 2010 Tree work. Recommendations

               The American National Standard:
               ANSI A300 (Part 1) -2017: Pruning

Tree Care on construction/ development sites:

               Australian Standard:
               AS 4970 - 2009 Protection of Trees on Development Sites

               The American National Standard:             
               ANSI A300 (Part 5)-2012: Management of Trees and Shrubs During Site Planning, Site Development, and
               Construction


The New Zealand Arboricultural Association also supports and recommends tree protection zones as;

  • The Tree Protection Zone (TPZ) which is a is a circle taken from the centre of the trunk with a radius equal to 12 times the diameter of the trunk measured at    1.4m (DBH) above ground level. An incursion of any more than 10% of the area of the TPZ is considered a ‘major incursion'
  • The Structural Root Zone (SRZ) which is a circle taken from the centre of the trunk with a radius equal to 3.31 times the diameter of the trunk measured just above the above the root buttress. No works should take place within the SRZ

Utility line clearance:

               The American National Standard:
               ANSI A300 (Part 7) - 2012: Integrated Vegetation Management

 
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