Gabion Walls: Wire Gauge, Coating & Stone Fill

Quick answer

For gabion retaining and erosion-control walls, use heavily galvanised or Galfan-coated welded or woven mesh baskets with a 50–100mm aperture and around 3.0–4.0mm wire; add PVC coating for coastal, polluted or aggressive sites, and fill with angular stone larger than the mesh aperture.

By the WireMeshQA editorial team · Independent wire mesh reference

What Gabions Are For

Gabions are wire mesh baskets filled with stone, used for retaining walls, erosion control, riverbank protection, noise barriers and landscaping. Their strength comes from the confined stone mass, so the wire must survive decades of outdoor exposure and the stone must be sized so it cannot escape the mesh.

Welded vs Woven Gabion Baskets

Welded gabions give crisp, rigid faces ideal for architectural and landscape walls. Woven (double-twist hexagonal) gabions flex without unravelling if a wire breaks, which suits riverbanks, slopes and ground that may settle. Choose welded for appearance and rigidity, woven for flexibility and ground movement.

Wire Gauge & Aperture

Gauge and aperture are matched to wall height and stone size. The values below follow common gabion conventions. Heavier walls and larger stone need thicker wire.

Aperture	Typical wire diameter	Typical use
50 x 50mm	3.0–4.0mm	Decorative / lower walls, smaller stone
80 x 100mm	2.7–4.0mm	Standard woven gabion
100 x 100mm	3.0–4.0mm	Larger walls, larger stone

Coatings: Galvanised vs Galfan vs PVC

Because gabions are structural and long-life, coating matters more than for ordinary fencing. Heavy galvanising is the baseline. Galfan (a zinc-aluminium alloy coating) lasts significantly longer than standard galvanising for similar cost. PVC over galvanised or Galfan adds the best corrosion resistance for coastal, polluted or chemically aggressive sites. See galvanised vs PVC-coated for the trade-offs.

Coating	Relative durability	Best for
Standard galvanised	Baseline	Dry, inland, lower-life walls
Heavily galvanised	Good	General structural gabions
Galfan (Zn-Al)	Better	Long-life walls, better value than PVC
PVC over galv/Galfan	Best	Coastal, polluted, aggressive sites

Stone Fill Selection

The stone must be larger than the mesh aperture so it cannot fall out — a common rule is fill stone between roughly 1.5 and 2 times the aperture, with no piece smaller than the opening. Use angular, hard, durable rock (such as granite or hard limestone); angular stone interlocks and stays stable, while rounded stone shifts. Hand-pack the visible faces for a neat finish.

Fill stone: roughly 1.5–2x the mesh aperture, never smaller than the opening.
Use angular, hard, non-friable rock for stability and longevity.
Add bracing wires across larger baskets to stop the faces bulging.
Lace or clip baskets together securely; this is what makes the wall act as one mass.
Estimate basket and stone weight for delivery with our weight calculator.

Frequently asked questions

What wire gauge is used for gabion baskets?

Gabion mesh typically uses wire around 3.0–4.0mm in diameter, with heavier walls and larger stone needing the thicker end of that range. Woven double-twist gabions are often around 2.7–3.0mm core wire plus a thicker selvedge edge. Always use heavily galvanised, Galfan or PVC-coated wire because gabions are long-life structural elements.

What size stone goes in a gabion?

Use fill stone larger than the mesh aperture so it cannot escape — a common rule is between about 1.5 and 2 times the opening, with no piece smaller than the aperture. For a 100mm mesh that means roughly 100–200mm stone. Choose angular, hard, durable rock such as granite, as it interlocks and stays stable.

What is the best coating for gabion walls?

Heavily galvanised wire is the baseline. Galfan, a zinc-aluminium coating, lasts considerably longer for similar cost and suits long-life walls. PVC over galvanised or Galfan gives the best corrosion resistance and is recommended for coastal, polluted or chemically aggressive sites. Match the coating to design life and environment rather than upfront cost alone.

What aperture should gabion mesh be?

Gabion mesh apertures are typically 50–100mm. A 50mm aperture suits decorative walls and smaller fill stone, while 80–100mm suits standard and larger walls with bigger stone. The aperture must always be smaller than the fill stone so the rock cannot fall out, so select aperture and stone size together.

Are welded or woven gabions better?

Welded gabions give rigid, crisp faces ideal for decorative and architectural walls. Woven double-twist hexagonal gabions flex without unravelling if a single wire fails, making them better for riverbanks, slopes and ground that may settle. Choose welded for appearance and rigidity, and woven for flexibility and resistance to ground movement.

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