Fence posts are the element most property owners pay insufficient attention to — until the first panel starts leaning. Posts carry all the wind and mechanical load of the fence structure. The panels between them can be anything at all, but if the posts are incorrectly installed, the entire fence will tilt after the first winter.
A recurring pattern: the owner orders beautiful designer fence panels, cuts costs on the posts, and a year later calls asking why the sections have gone crooked. The answer is almost always the same: tube too thin, insufficient installation depth, or no drainage around the post. All three mistakes are made at selection stage and can only be corrected by full removal and reinstallation.
Fence Post Materials: What Actually Holds Up
Material selection depends on the panel type and weight, local climatic conditions, and the required service life.
| Material | Service life | Maintenance | Max load | Best for |
|---|---|---|---|---|
| Powder-coated steel | 20–30 years | Minimal | High | Metal panels, gates, heavy sections |
| Galvanised steel | 15–25 years | None required | High | Mesh fencing, industrial sites |
| Aluminium | 30+ years | None required | Medium | Light panels, coastal locations |
| Reinforced concrete | 30–50 years | None required | Maximum | Brick pillars, heavy gates |
| Treated timber | 5–10 years | Annual | Low | Decorative lightweight fences |
Cross-Section Shape: Square, Rectangle or Round
Square profile (60×60, 80×80, 100×100 mm) — the most common choice. Distributes load evenly; brackets, hinges, and locks attach with ease. The standard used by most panel manufacturers.
Rectangular profile (60×40, 80×60 mm) — slightly cheaper, suitable for lighter non-load-bearing fences. Not recommended for gate posts: load distribution is uneven.
Round tube — the most affordable option but awkward to work with. Suitable for simple mesh fences but not for designer panels or automated gates.
Installation Depth: The Formula That Matters
Incorrect installation depth is the most common reason for leaning fence posts.
- General rule: a minimum of one third of the total post length must be in the ground. For a 3 m post: depth of 100 cm.
- Climate adjustment: the base of the post must sit 20–30 cm below the local frost line.
- Gate posts carry the weight of the gate panel: minimum installation depth of 120 to 150 cm.
- On slopes and loose soils: increase depth by 20–30%, or use a broadened base foot.
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Concreting vs Driving: Which Is More Reliable
Concreting is the standard for heavy panels, gate posts, and all load-bearing structures. One important detail: a drainage gap must be left at the base to prevent water accumulation and corrosion.
Driving is faster and cheaper for light panels on firm ground. For gate posts, heavy panels, and areas with seismic activity: concreting only.
Post Spacing and Number of Supports
- Welded metal mesh panels (3D mesh): 2.0–2.5 m between posts.
- Designer metal sections with louvres: 1.5–2.0 m.
- Corrugated sheet and solid constructions: 2.0–2.5 m, but no more than 2.0 m when height exceeds 2 m.
- Timber and WPC sections: no more than 1.5–2.0 m.
- Fencing along a road or exposed windy site: 1.5 m regardless of panel type.
Conclusion
Correctly specified fence posts are the invisible foundation that nobody notices as long as the fence stands straight. Saving on material or installation depth means starting from scratch after the first severe wind or frost.
📖 Read also on the Miradex blog:
Fence Foundation: Types and Selection Rules | Automatic Sliding Gates
💬 Book a free consultation — a Miradex specialist will help you find the right solution for your property.
