TerraStack® Precast Modular Panel Retaining Walls
A practical retaining wall solution for residential, civil and landscape projects.
TerraStack® is a modular precast concrete retaining wall system developed by Geoquest Australia & New Zealand to meet the needs of residential developments, light civil works and professional landscaping applications.
Designed for ease of construction without compromising engineering performance, TerraStack® offers a smart alternative to traditional large‑scale retaining wall systems — particularly where speed, manual handling and cost efficiency matter.
Retaining walls from under 1 metre to 6 metres high
Suitable for retaining wall applications from below 1.0 metre to heights of up to 6.0 metres, TerraStack® is a flexible solution for:
- Residential subdivisions and housing developments
- Residential landscaping
- Landscape terraces, parks and public open spaces
- Local roads, pathways and low‑rise infrastructure
- Commercial developments and urban environments
The system balances practical site installation with the robust performance expected of a Geoquest engineered solution.
How TerraStack® works
TerraStack® is a retaining wall system comprising:
- Precast concrete facing panels designed for manual handling
- Purpose‑designed precast concrete counterforts
- Geogrid soil reinforcement (for walls greater than 1.0m)
- Compacted structural fill forming the reinforced soil mass
Gravity retaining walls or reinforced construction
For walls under 1.0 metre in height, TerraStack® can be configured as a gravity retaining wall, without the need for soil reinforcement.
For taller walls, geogrid reinforcement is incorporated to create a high‑performance reinforced soil structure, working as a single, coherent system.
Key benefits
Manual handling friendly
- Panels weigh less than 25 kg
- No requirement for cranage in most installations
- Safer, simpler handling on site
Faster to build
- Only 5.5 panels per square metre
- Fewer units compared to many modular systems
- Efficient construction sequencing
Engineered performance
- Designed in accordance with AS 4678
- Supported by full‑scale testing and Geoquest R&D
- Predictable performance over the design life
Cost‑effective and efficient
- Reduced concrete usage compared to large block systems
- Lower transport and installation demands
- Optimised for low to medium retaining heights
Aesthetics that suit the built environment
TerraStack® delivers a clean, contemporary architectural finish suitable for both residential and public‑facing spaces.
The smaller modular panels provide a refined visual scale, with options for:
- Bespoke textures and surface finishes
- Tailored layouts to suit the surrounding environment
- Paintable surface for specific colours and finishes, including anti-graffiti coatings
This flexibility allows designers and developers to achieve a strong aesthetic outcome without sacrificing constructability or performance.
Sustainability advantages
By using smaller, lighter precast elements, TerraStack® requires significantly less concrete than many traditional retaining wall systems. This results in:
- Reduced material consumption
- Lower embodied carbon
- Fewer transport impacts
TerraStack® supports more sustainable construction outcomes while maintaining durability and long‑term performance.
Backed by Geoquest expertise
TerraStack® is designed, engineered and supplied by Geoquest, drawing on six decades of international experience in mechanically stabilised earth structures, and 50 years of local operations in Australia & New Zealand.
Our local teams provide:
- Concept and detailed design support
- Engineering verification and compliance
- Construction guidance and technical assistance
A system that is simple to build — with the assurance of a trusted global specialist behind it.
Typical applications
- Residential subdivision retaining walls
- Landscape and architectural retaining structures
- Local infrastructure and streetscapes
- Commercial and mixed‑use developments
- Public realm and open space projects
Let’s talk TerraStack®
If you’re looking for a simpler, faster and practical retaining wall solution for residential, civil or landscape projects, TerraStack® is the right fit.
Contact your Geoquest Australia & New Zealand office to discuss your project requirements and explore how TerraStack® can be tailored to your site.
Learn more about the modular retaining wall solution via our Frequently Asked Questions – TerraStack®.
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