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AS 4970-2009


Protection of trees on development sites

Provides guidance on the principles for protecting trees on land subject to development.
Published: 26/08/2009
Pages: 27
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.4 Definitions
2 Planning and the tree management process
2.1 Tree management process
2.2 Determining authorities
2.3 Planning
2.3.1 Site survey
2.3.2 Preliminary tree assessment
2.3.3 Preliminary arboricultural report
2.3.4 Development design and review
2.3.5 Arboricultural impact assessment
3 Determining the protection zones of the selected trees
3.1 Tree protection zone (TPZ)
3.2 Determining the TPZ
3.3 Variations to the TPZ
3.3.1 General
3.3.2 Minor encroachment
3.3.3 Major encroachment
3.3.4 TPZ encroachment considerations
3.3.5 Structural root zone (SRZ)
3.3.6 Crown protection
4 Tree protection measures
4.1 General
4.2 Activities restricted within the TPZ
4.3 Protective fencing
4.4 Signs
4.5 Other tree protection measures
4.5.1 General
4.5.2 Trunk and branch protection
4.5.3 Ground protection
4.5.4 Root protection during works within the TPZ
4.5.5 Installing underground services within TPZ
4.5.6 Scaffolding
4.6 Maintaining the TPZ
4.6.1 Mulching
4.6.2 Watering
4.6.3 Weed removal
5 Monitoring and certification
5.1 General
5.2 Tree protection plan
5.3 Pre-construction
5.3.1 Tree removal and pruning
5.3.2 Installing tree protection fencing and other protection measures
5.4 Construction stage
5.4.1 General
5.4.2 Site establishment
5.4.3 Construction work
5.4.4 Landscape works
5.4.5 Practical completion
5.5 Post-construction
5.5.1 Defects liability period
5.5.2 Final certification
Appendix A
Appendix B
B1 Introduction
B2 Background biology
B2.1 General
B2.2 Leaves
B2.3 Trunks and branches
B2.4 Roots
B3 Effects of development on trees
B3.1 General
B3.2 Crown damage
B3.3 Trunk damage
B3.4 Root damage
B4 Conclusions
Appendix C
Appendix D
Appendix E
Amendment control sheet
Cited references in this standard
Safety signs for the occupational environment
Pruning of amenity trees
Composts, soil conditioners and mulches
Temporary fencing and hoardings
Content history
AS 4970-2009 REC:2020
DR AS 4970
Inclusive of GST
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