DuraPost reinforcement bars are used in conjunction with DuraPost composite gravel boards to help retain soil and stone against your fence line. These are slipped in the hollow section of the composite gravel board during the installation process of your fencing.
The reason to use 1 bar per gravel board is to reduce the chance of the gravel board bowing with the added weight against it. Not doing this risks the panel not being supported correctly and can lead to damage to your fence panels.
If you have any questions, please do not hesitate to get in contact with a member of the team.