Chainwire Fencing for Schools and Industrial Sites: Mesh Specs, Coatings, and Australian Standards Explained
Chainwire fencing is the backbone of school perimeters, industrial estates, and commercial sites across Australia. It's durable, cost-effective, and when specified correctly, fully compliant with Australian standards. The problem is most buyers don't know what "specified correctly" actually means until they're staring at a failed inspection.
This guide gives you the technical specs you need: mesh sizes, wire gauges, coating types, and the exact requirements for DET school projects and industrial applications.
Why Chainwire is the Go-To for Schools and Industrial Sites
Chainwire fencing offers three things that matter most to schools, councils, and industrial operators: visibility (supervision isn't compromised by a solid barrier), durability (galvanised steel wire holds up in all Australian climate zones), and scalability (it can be specified at multiple security levels using the same basic product system).
Its open structure also means less wind loading than solid panel fencing, which reduces post embedment requirements and overall installation cost on large sites.
Chainwire Mesh Size and Wire Gauge: What the Numbers Mean
The two most important technical specs on a chainwire product are mesh aperture (the size of each diamond opening) and wire gauge (the thickness of the wire used to weave it). Together, they determine the security level, climb resistance, and applicable standard.
| Mesh Aperture | Wire Gauge | Application | Standard |
|---|---|---|---|
| 50mm diamond | 2.5mm | General commercial, rural boundary | AS 1725 Class 1-2 |
| 50mm diamond | 3.15mm | Industrial perimeter, transport | AS 1725 Class 2-3 |
| 60mm diamond | 2.25mm | Temp Fencing | General use |
| 25mm diamond | 2.5mm | Golf Course | General use |
Fuse Bonded vs PVC Coated Chainwire: Which Should You Specify?
Both fuse bonding and PVC coating add a protective layer over the galvanised steel wire. They serve the same purpose, but work differently:
- Fuse bonded chainwire: A polymer coating is applied to each wire before the mesh is woven. This means the coating covers the entire wire surface, including the wire-to-wire contact points inside each diamond. It provides excellent corrosion resistance and a clean appearance without the bulk of PVC.
- PVC coated chainwire: A thicker PVC sleeve is extruded over the finished wire or mesh. It adds more visual bulk and is available in multiple colours (typically green, black, or galvanised silver). The PVC layer provides an additional barrier against corrosion and abrasion.
For most commercial and school applications, fuse bonded is the preferred specification in Australia. PVC coated is more common in landscapes, parks, and agricultural settings where colour matching or aesthetics are a priority.
Galvanised Coating Mass: What AS/NZS 4534 Requires
Coating mass is measured in grams per square metre of wire surface and is the key indicator of how long galvanised chainwire will resist rust. Under AS/NZS 4534:
- Minimum 245 g/m2 for light commercial applications.
- Minimum 275 g/m2 for standard security applications (AS 1725 Class 2-3).
- Higher coating mass for coastal environments, chemical exposure, or high-security classifications.
If a supplier cannot provide the coating mass specification for their chainwire, that is a red flag for a compliance-sensitive project.
Post Spacing, Tension, and Gate Integration for Commercial Chainwire
Getting the mesh spec right is only half the job. Structural performance also depends on post diameter and embedment depth, horizontal rail spacing, tensioning method, and gate frame design. For industrial and school sites:
- Posts are typically 48mm or 60mm OD steel, hot-dip galvanised, set in concrete at a minimum depth of 600mm to 900mm.
- Line posts are spaced at 3m centres for standard commercial applications; corner and end posts are heavier gauge.
- Gates must use matching frame sections and the same chainwire spec as the perimeter fence.
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Further reading
Why buy from Fencing Components
- Steel and aluminium fencing manufactured to Australian Standards
- Over 22 powder-coat colour options across the range
- Nationwide delivery — order online or visit Chipping Norton NSW
- Open to the public — no minimum order
- Click & Collect available
58 Governor Macquarie Drive, Chipping Norton NSW 2170 | 02 9755 2666
Frequently Asked Questions
What chainwire mesh size is standard for Australian commercial fencing?
50mm diamond mesh with a 2.5mm or 3.15mm wire gauge is the most common specification for commercial chainwire fencing in Australia. Heavier gauges are used for industrial and higher-security applications. The 50mm aperture is the standard reference point in AS 1725.
Does school fencing in NSW have to meet DET spec?
For all DET-funded projects, yes. The NSW Department of Education and Training School Specification prescribes specific panel gaps, coating types, and heavy-duty requirements. Schools built or upgraded with DET funding must use DET-compliant panels. For independent or Catholic schools, compliance is strongly recommended but may not be mandated.
What is the difference between Gap 80, Gap 90, and Gap 110 in school fencing?
These refer to the clear gap between vertical pickets on steel security panels. Gap 80 (80mm maximum) is used for childcare and pedestrian areas to reduce entrapment risk for small children. Gap 90 and Gap 110 are used for standard school perimeter panels. The choice depends on the area of the school being fenced and the security level required.
Is fuse bonded or PVC coated chainwire better for a school?
For school perimeter applications in Australia, DET spec typically requires steel security panels (not chainwire mesh) for the perimeter. Where chainwire is used (e.g. internal courts, sports areas), fuse bonded is generally preferred for its clean appearance and even coating coverage. PVC coated is an option where a specific colour (green, black) is needed.
What is the minimum wire gauge for industrial chainwire fencing?
For industrial perimeter security (AS 1725 Class 2-3), a minimum 3.15mm core wire diameter is recommended. For Class 4 and heavy industrial applications, 4.0mm wire is the typical specification. Light 2.5mm wire is suitable for boundary delineation and rural applications but not for perimeter security on industrial or commercial sites.
How long does galvanised chainwire last in Australian conditions?
Well-specified galvanised chainwire with a coating mass of 275 g/m2 or above will typically last 20 to 40 years in a non-coastal, non-industrial environment. Coastal or high-humidity locations accelerate corrosion; in these environments, PVC coated or fuse bonded chainwire with a higher coating mass is a better investment.
Can chainwire fencing be used for a pool fence?
Standard chainwire fencing is NOT suitable for pool fencing under AS 1926.1. The mesh aperture (50mm diamond) allows footholds that violate the non-climbable zone requirement. Compliant pool fencing requires apertures of no more than 100mm measured any direction, combined with a non-climbable zone, which standard chainwire does not provide.
Do you supply chainwire and steel security panels for projects outside NSW?
Yes. Fencing Components supplies Australia-wide. Product specs (wire gauge, mesh size, coating type) are consistent across all states. State-specific requirements (such as Victorian or QLD education department specs) may differ from the NSW DET spec; confirm the relevant local standard before ordering for interstate government projects.
Need chainwire for a school or industrial project?
Fencing Components stocks DET school spec panels and industrial chainwire with product data sheets available on request.