Concrete, Cement & Bonding Agents

Concrete, Cement & Bonding Agents for Retaining Wall Post Footings

Every steel post in a concrete sleeper retaining wall needs a solid footing — and that footing is only as good as the concrete mix used to set it. Getting the footing right is one of the most critical steps in the entire build. An undersized or poorly mixed footing is the most common cause of post movement and wall failure over time.

Our range of concrete, cement, and bonding agents is selected specifically for retaining wall post footing applications — trade and DIY quantities available, with Australia-wide delivery.

Post Footing Basics

Steel retaining wall posts are typically set in concrete footings that extend below the base of the wall. The footing depth should be at least one-third of the total post length — and often more in soft, wet, or expansive soils. The footing diameter should be sufficient to resist the lateral loads imposed by the retained soil.

As a general guide for residential walls:

• Use a minimum 20MPa concrete mix for post footings
• Footing diameter typically 300–450mm depending on post size and wall height
• Allow concrete to cure fully (minimum 24–48 hours) before backfilling and loading the wall
• In wet or reactive soils, consult your engineer for footing specifications

Note: For walls over 1.0m or in challenging soil conditions, footing design should be confirmed by a licensed structural engineer.

What's in This Range

• Rapid-set concrete — ideal for post footings where you need to backfill and continue work quickly
• Standard concrete mix — for larger footing pours or where extended working time is needed
• Cement & sand — for mixing custom batches on larger projects
• Bonding agents — for repairs, patching, and bonding new concrete to existing surfaces

Works With Your Post System

• H-beam & universal column steel posts
• C-channel & PFC steel posts
• Corner, L-posts, joiner & end posts

Complete Your Wall System

• Drainage kits, ag pipe & weep holes — essential for long-term wall performance
• Hardware, brackets & cleats — fixings to complete the installation
• Retaining wall starter kits — sleepers, posts & drainage in one order

Not sure how much concrete you need for your footings? Use our cost calculator or contact our team for a material estimate.