SUPERSEDED - Approved Plans & Documents - OPW22 0299 · OPW22/0299

                                                                                                       Consult Arborist

                 9.3 ESTABLISHING TREE PROTECTION
                 Figure 10 shows a typical representation of a tree protection system. Tree root systems are
                 generally shallow in nature with most of the roots found within the top 1m of soil and a higher
                 density of roots found closest to the surface where moisture and nutrients are more readily
                 available. The function of the TPZ is to ensure that the tree has a viable root system, so the
                 tree has a functional future as an amenity asset within the development.

                 The structural standing of a tree is linked to critical aspects of roots (found in the TPZ) to bind
                 the soil and create a mass that the tree can anchor to. These roots consist of ‘Secondary roots’
                 (medium size) and ‘Tertiary roots’ (small size).

                 Primary roots (large size) found in the SRZ connect the tree to the anchor system. Primary
                 roots by themselves do not bind enough soil to create a stable anchor system.

                 The shallow nature of tree roots should be taken into consideration when working close to
                 trees and when installing the tree protection fencing for the Tree Protection Zone.




                                       Figure 10: Example of an ideal generic Tree Protection System




                 9.4 TPZ SIGNS
                 The signs identifying the TPZ / ‘No-Go Zone’ are to be placed around the edge of the TPZ in
                 locations visible to the site as per Tree Protection Fencing Standards Australia marketing
                 media AS4970 – 2009.

                 9.5 TRUNK PROTECTION
                 Trunk protection, to prevent direct contact with the tree’s trunk and buttress roots can be
                 installed. This can comprise Geo fab/20mm thick hessian and wooden battens strapped/taped
                 to the tree’s trunk with a skirt over the buttress roots.




                 22_10_31_AIA_Markbain_Natasha Katharina                                                 Page 18 of 26
Document Set ID: 22190640
Version: 1, Version Date: 28/11/2022