Free standing walls should not exceed the 2:1 ratio

Std retaining walls should not exceed the 2:1 ratio

Walls less than the 2:1 ratio need internal supports to prevent collapse

Retaining walls with additional loads on top of them, e.g. driveways, banks, buildings, will require extra depth, and possibly an engineer's design.

Gabion support posts must extend to at least 1.5 x Depth from the top of the gabion basket

Gabion support posts spacing should be no greater than 1.0m apart.