100 Standard Series Steel Posts Brisbane & Queensland

100 Standard Series Steel Posts for Retaining Walls — Brisbane & Queensland

The 100 Standard Series is the most widely used steel post system for residential concrete sleeper retaining walls across Brisbane and South East Queensland. Covering both C-Channel (PFC) and H-Beam (UC) profiles in the 100mm flange width range, the 100 Series suits the majority of standard residential retaining wall projects — from low garden bed walls to boundary walls up to 1.5m with the right post selection and embedment depth. Retaining Walls Direct has supplied 100 Series posts to Brisbane builders, landscapers, and homeowners for over 40 years.

100 Series Post Types

• 100 C-Channel (PFC) — the standard residential post for walls under 1.0m in stable, well-drained ground. Lightweight and cost-effective for DIY and trade projects.
• 100 H-Beam (UC) — the structural choice for walls over 1.0m, on clay soils, or with surcharge loading. The post most commonly specified by engineers for Brisbane residential projects.
• 100 Series Corner Posts (45° & 90°) — purpose-built corner posts for direction changes in the 100 Series system.
• 100 Series End Posts & Joiners — for clean wall terminations and step-down sections.

Features & Specifications

• Hot-dip galvanised to AS/NZS 4680 — corrosion-resistant in Queensland's subtropical conditions
• 100mm flange width — accepts standard 75mm and 100mm concrete sleepers
• Supplied in standard lengths — cut to embedment depth on site
• Compatible with our full Brisbane and Queensland concrete sleeper range
• Suitable for standard residential retaining walls up to 1.5m (engineer certification required above 1.0m)

When to Upgrade to the 150 Heavy Duty Series

The 100 Standard Series is appropriate for most residential projects. Upgrade to the 150 Heavy Duty Series when:

• Your wall exceeds 1.5m in height
• There is significant surcharge loading — vehicles, structures, or steep embankments above the wall
• Your structural engineer has specified 150 Series posts in their design
• The project is commercial or requires a higher factor of safety

QLD Council & Engineering Requirements

In Queensland, retaining walls over 1.0m require a building development approval and structural engineer's certification. Key references:

• QBCC — Building Approvals Queensland
• AS 4678-2002 — Earth Retaining Structures
• Retaining Wall Regulations — State-by-State Guide

Delivery Across Brisbane & Queensland

We deliver 100 Series steel posts direct to your site across Brisbane metro, the Gold Coast, Sunshine Coast, Ipswich, Logan, Moreton Bay, and regional QLD. Bulk and trade pricing available — open a trade account for priority pricing and faster dispatch.

Related Products

• Retaining Wall Steel Posts — Brisbane QLD
• C-Channel Steel Posts — Brisbane & QLD
• H-Beam Steel Posts — Brisbane & QLD
• 150 Heavy Duty Series — Brisbane & QLD
• Concrete Sleepers — Brisbane QLD

Guides & Resources

• H-Beam vs C-Channel Steel Posts — Which Do You Need?
• How to Choose the Right Steel Post for Your Retaining Wall
• How to Build a Retaining Wall with Concrete Sleepers