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The barrier should be installed vertically, or if conditions allow, with the top inclined towards the tree, NEVER with the top inclined away from the tree as this will encourage upward growth of roots.
The barrier MUST be installed with root guiding ribs facing towards the roots.
GRADIENTS: It is VERY IMPORTANT that the panels are installed with tops HORIZONTAL and the root guiding ribs are therefore VERTICAL. If necessary, the panels should be 'Stepped' and the tops trimmed above grade after installation. Root guides which are not vertical can guide roots upwards as well as downwards.
Install barrier with top above grade, do not allow space for root overgrowth.