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Retaining Walls

Retaining walls are both structural and aesthetic elements that must perform for decades under lateral earth pressure, moisture, and seasonal movement. We supply purpose-designed concrete mixes for gravity, cantilever, and reinforced retaining walls, with the pumpability needed to fill narrow forms and the durability to resist freeze-thaw and sulfate attack.

Quick Specifications

Strength Range3,500 – 5,000 PSI
Water-Cement RatioMax 0.45 (high durability)
Air EntrainmentAvailable for freeze-thaw exposure
Sulphate ClassDS-2 or DS-3 mix available
AdmixturesSuperplasticizer, crystalline waterproofing
Slump for Pumping150–200mm

Key Features of Our Retaining Walls

High-Durability Mix Design

Low water-cement ratio mixes with supplementary cementitious materials for reduced permeability and long-term resistance to ground chemicals.

Pumpable for Narrow Forms

High-flow mixes fill narrow retaining wall forms completely, eliminating voids that cause long-term structural weakness.

Freeze-Thaw Protection

Air-entrained mixes for walls in exposed locations subject to freeze-thaw cycling, preventing surface scaling and spalling.

Drainage Design Advice

Our team advises on weep-hole placement and backfill drainage to reduce hydrostatic pressure on finished walls.

Block and Reinforced Options

Concrete supply for both in-situ reinforced retaining walls and precast block fill cores, depending on your wall type.

Tiered Wall Capability

We plan multi-stage pours for tiered retaining systems, ensuring each level reaches required strength before the next is loaded.

Typical Applications

  • Garden and landscaping terraces
  • Driveway level-change walls
  • Road and embankment retention
  • Swimming pool surrounds
  • Cut-and-fill site retention
  • Commercial loading dock walls
  • Basement perimeter walls

Mix Specifications

Strength Range3,500 – 5,000 PSI
Water-Cement RatioMax 0.45 (high durability)
Air EntrainmentAvailable for freeze-thaw exposure
Sulphate ClassDS-2 or DS-3 mix available
AdmixturesSuperplasticizer, crystalline waterproofing
Slump for Pumping150–200mm

Frequently Asked Questions

How thick does a concrete retaining wall need to be?
This depends on the retained height and soil type. A rule of thumb is that wall thickness should be at least 1/12 of the retained height for cantilever walls. Our engineers will check your specific conditions.
Do retaining walls need drainage behind them?
Yes. Poor drainage is the primary cause of retaining wall failure. We advise on weep holes, drainage aggregate, and membrane systems as part of every retaining wall project.
Can you pour a retaining wall against a cutting?
Yes. For walls poured against a soil cutting, we use retarder admixtures to extend workability and ensure complete consolidation against the irregular face.
What is the maximum height for a single-pour retaining wall?
We typically pour retaining walls in lifts of 1–1.5m to manage formwork pressure. Taller walls are poured in staged lifts with appropriate form stripping times between pours.

Ready to Start Your Retaining Walls Project?

Get a free, itemized quote from our team within 24 hours. No obligation, no pressure.