The H Section Steel Middle Post is designed for the straight middle sections of concrete sleeper retaining walls. Also known as an H-beam or Universal Column retaining wall post, this steel post allows concrete sleepers to slot into both sides of the post, creating a strong continuous wall run between end posts, corner posts, and corner connections.
Manufactured from hot rolled steel and finished with hot dipped galvanising, this H Section Steel Middle Post provides long-term protection against outdoor exposure, soil moisture, corrosion, termites, insects, and fire. It is suitable for 75mm thick concrete sleepers and is commonly used where a stronger post specification is required than a standard C-channel post.
The H Section Steel Middle Post is available in multiple lengths so the correct post can be selected to suit the finished retaining wall height, required footing depth, soil type, sleeper length, and engineering requirements. Post length should always allow for both the visible wall height and the required in-ground embedment depth.
| Post Length | Typical Use |
|---|---|
| 900mm | Low garden walls, edging walls, and short retaining wall sections where limited retained height is required. |
| 1200mm | Low residential retaining walls where additional in-ground embedment is needed. |
| 1600mm | Common residential retaining wall heights where stronger H-section support is preferred over C-channel. |
| 1800mm | Medium retaining walls, boundary walls, and walls requiring deeper footing support. |
| 2000mm | General retaining wall projects where wall height, soil pressure, or site conditions require a stronger middle post. |
| 2400mm | Taller wall sections or projects requiring additional embedment depth and stronger post stiffness. |
| 2700mm | Higher retaining walls, sloping blocks, reactive soil sites, and engineer-specified layouts. |
| 3000mm | Heavy-duty residential retaining walls requiring greater in-ground depth and lateral resistance. |
| 3600mm | Tall retaining walls, stepped retaining walls, and more demanding structural applications. |
| 4200mm | Maximum listed length for taller walls, deep embedment, and engineer-specified retaining wall systems. |
An H Section Steel Middle Post provides support on both sides of the post. This makes it the correct post type for the straight internal sections of a concrete sleeper retaining wall, where sleepers continue from one bay into the next. The H-shaped profile holds the end of one sleeper bay on one side and the start of the next sleeper bay on the other side, keeping the wall aligned and helping transfer lateral soil pressure into the concrete footing.
The 100 UC steel section provides greater stiffness than a standard C-channel profile. This makes H-section posts suitable for retaining wall sections where wall height, clay soil, surcharge loads, post spacing, or engineering requirements call for stronger lateral resistance.
Post length should not be selected based only on the visible wall height. The full post length must allow for the finished retained height above ground plus the required in-ground embedment depth. Embedment depth depends on soil conditions, retained height, footing diameter, footing depth, post spacing, surcharge load, and engineering requirements.
As a general installation principle, taller retaining walls require longer posts because more steel must be embedded into the concrete footing to resist overturning and lateral earth pressure. For walls over 1.0m, walls in clay soils, or walls with surcharge loads above, post size, post spacing, and footing depth should be confirmed by a qualified structural engineer.
A C Section Steel End Post is typically used at the start or end of a retaining wall run, while an H Section Steel Middle Post is used between wall bays. The C-shaped profile holds sleepers on one side only, making it suitable for wall ends and some lower wall applications. The H-shaped profile holds sleepers on both sides and provides stronger support for the continuous middle sections of the wall.
For low walls in stable, well-drained ground, C-channel posts may be suitable. For taller walls, clay soils, surcharge loads, or engineer-specified designs, H-section posts are generally the stronger and more appropriate choice.
Correct installation is critical for retaining wall performance. H Section Steel Middle Posts must be set plumb, aligned accurately, spaced to suit the concrete sleeper length, and embedded into correctly sized concrete footings. Poor alignment can make sleeper installation difficult and may create visible gaps or uneven wall lines.
The concrete footing must be designed to resist overturning and lateral pressure from the retained soil. The hole diameter, depth, concrete strength, and embedment depth should suit the wall height and ground conditions. Where engineering drawings are supplied, always follow the specified post spacing, footing size, and concrete requirements.
Drainage should be installed behind the wall to reduce hydrostatic pressure. A typical drainage system includes free-draining aggregate, geotextile fabric, and slotted agricultural pipe at the base of the wall discharging to a legal outlet. Drainage is especially important in clay soils because retained water can significantly increase load on the wall.
Custom gauges, custom lengths, step-downs, and welded steel fence brackets are available by request. These options may be required for stepped retaining walls, fence-over-wall applications, unusual site levels, non-standard wall heights, or engineer-specified projects.
H Section Steel Middle Posts are available in 900mm, 1200mm, 1600mm, 1800mm, 2000mm, 2400mm, 2700mm, 3000mm, 3600mm, and 4200mm lengths. Delivery is available across Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra, Gold Coast, and regional Australia. Get a free quote for your retaining wall project.
You'll get the inside scoop on flash sales, new product releases and be entered in a contest for a year's worth of fresh content!
