Specifying structural void fill systems starts with understanding the role of the space being filled. The designer on a retaining-wall project in Australia needs to distinguish that space from the ground supporting the wall. The category includes Void Fill, Landscape Structural Lightweight by Atlantis Corporation, a lightweight option for landscape construction.

Structural Void Fill Systems

A product such as Void Fill, Landscape Structural Lightweight needs to be assessed against the completed wall design, including loads from the ground above it. Establish the required performance with the project engineer rather than treating a lightweight fill as equivalent to conventional backfill. Installation planning should also account for how the product will be placed before the surrounding construction closes off access.

Can lightweight void fill replace compacted backfill?

Do not treat the two as interchangeable without approval from the wall designer. Confirm which parts of the design require compacted material and where a void fill product is permitted.

Does void fill remove the need for drainage?

Keep drainage as a separate design requirement unless the selected system’s documentation explicitly addresses it. Allow access for the specified drains and outlets when detailing the fill.

When should the void fill be specified?

Resolve the selection before the retaining-wall details are finalised, so product dimensions and installation access can be accommodated. Include the approved product and its placement requirements in the construction documentation.