Galvanised Steel Corner Posts 100mm are designed for concrete sleeper retaining wall systems where the wall changes direction at a corner. These posts provide a strong, clean connection point for 90-degree retaining wall corners, helping concrete sleepers sit securely in both wall directions while maintaining a neat and structurally stable corner detail.
Manufactured from galvanised steel, these 100mm corner posts provide long-term protection against corrosion, soil moisture, weather exposure, termites, insects, and fire. They are commonly used with concrete sleeper retaining walls in residential landscaping, boundary walls, garden walls, raised garden beds, driveway retaining walls, and stepped retaining wall layouts.
Galvanised Steel Corner Posts 100mm are available in multiple lengths so the correct post can be selected to suit the finished wall height, required embedment depth, soil conditions, wall layout, and engineering requirements. The total post length must allow for both the visible retaining wall height above ground and the required in-ground footing depth below ground.
| Post Length | Typical Use |
|---|---|
| 800mm | Low garden corners, small retaining wall returns, raised garden beds, and shallow landscape walls. |
| 1200mm | Low residential retaining wall corners where additional embedment depth is needed. |
| 1600mm | Common garden and boundary retaining wall corners in suitable ground conditions. |
| 2000mm | Medium retaining wall corners where extra post length and footing depth are required. |
| 2400mm | Higher corner sections, stepped wall returns, and engineer-approved retaining wall layouts requiring deeper embedment. |
A corner post is used where a concrete sleeper retaining wall changes direction, most commonly at a 90-degree corner. Unlike a standard C post that supports sleepers from one side, or an H post that supports sleepers in a straight continuous run, a corner post is shaped to receive sleepers from two directions. This allows the wall to turn neatly while keeping both wall faces aligned.
Corner posts are important because corners can concentrate load and create alignment challenges during installation. A correctly selected galvanised steel corner post helps keep the wall square, supports the sleeper ends, and provides a clean structural transition between the two wall runs.
Post selection should always consider wall height, soil type, footing depth, drainage, surcharge loads, and whether the wall is supporting a fence, driveway, structure, or sloping ground above. For walls over 1.0m, clay soil sites, surcharge conditions, or engineer-specified projects, post size, footing depth, and post spacing should be confirmed before installation.
Each retaining wall post type has a specific role. C posts are generally used at the start or end of a wall run where sleepers are supported from one side. H posts are used in the middle of straight wall runs where sleepers continue from one bay to the next. Corner posts are used where the wall changes direction and sleepers need to be supported from two angled directions.
Using the correct post type improves wall alignment, reduces installation issues, and helps the retaining wall system perform as intended. For a complete concrete sleeper retaining wall, most projects use a combination of C posts, H posts, and corner posts depending on the wall layout.
Correct installation is critical for retaining wall performance. Galvanised Steel Corner Posts should be set plumb or to the required back lean, aligned carefully with both wall runs, and embedded into correctly sized concrete footings. The two connecting wall runs should be set out before concreting the corner post so the post sits square and sleepers can be installed cleanly.
The footing must be deep and wide enough to resist lateral earth pressure from the retained soil. Corner posts can be subject to load from two directions, so footing size, embedment depth, soil type, and drainage should be carefully considered. Where engineering drawings are supplied, always follow the specified post size, footing depth, concrete strength, and post spacing.
Drainage should always be installed behind the retaining wall. A suitable drainage system normally includes free-draining aggregate, geotextile fabric, and slotted agricultural pipe at the base of the wall discharging to a legal outlet. Poor drainage can increase hydrostatic pressure behind the sleepers and may lead to movement, leaning, cracking, or wall failure.
Galvanised Steel Corner Posts 100mm are available in 800mm, 1200mm, 1600mm, 2000mm, and 2400mm 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.
