Gabion Walling
Rock or crushed arisings packed into wire baskets and stacked as a gravity wall. No mortar and no foundation slab in most cases — the mass and the friction of the fill do the work, and the wall drains freely through itself.
Carbon and evidence
How This Is Made
An Environmental Product Declaration is issued by a manufacturer against a declared unit. This record has neither, so it states sourced facts about process and provenance instead of a carbon figure.
Civil and river engineering since the nineteenth century; the woven-wire basket is an Italian development that became standard UK practice for revetments and retaining work
Process
Feedstock
Mineral
Angular quarried rock, site-won stone, or crushed concrete and brick arisings. The cage is drawn steel wire, separately.
Process heat
Furnace-melted
The stone is quarried and crushed and needs no heat at all. The cage does: it is drawn steel wire with a zinc or zinc-aluminium coating, and that is where a gabion's process energy actually sits. Recording this as low-processing because it is "stone in a basket" would be leaving out the half that carries the impact.
Binder
No binder
Fabrication
Site-formed
Sourcing: Baskets from a small number of manufacturers; fill is local quarry stone, site-won rock or arisings from the same site
Who Builds It
Trained contractor
Established in the UK
Machine-filled for mass work; a fair face has to be hand-placed stone by stone, and that labour is the entire cost difference between a civils gabion and an architectural one
End Of Life
Separable
Cut the wire and the two materials come apart cleanly — stone back to aggregate, mesh to steel scrap. There is no mortar to break out and nothing bonded to separate.
Maintenance: Fill settles in the first year or two and is topped up. After that the wall's life is the coating's life, not the stone's.
Specification Risk
What a specifier has to resolve before this can be built.
- Certification
- The mesh is covered — woven to BS EN 10223-3, welded to BS EN 10223-8, coatings to BS EN 10244-2 — and gabion boxes and mattresses have a European Assessment Document, EAD 200050-01-0102. None of that covers the filled wall, which is designed rather than certified.
- Fire
- Non-combustible stone in a steel cage, but no classification is held for the assembly.
- Warranty
- The mesh carries the manufacturer's warranty. The wall carries the contractor's workmanship warranty and nothing else.
- Insurance
- Retaining applications are an engineered use needing geotechnical design and sign-off; boundary and screen walls are not normally an issue.
- Supply
- Baskets are readily available. The binding constraint is the fill — grading, angularity, and how far it has to come.
Read This Honestly
- •Design life is the coating's, not the stone's. Galvanised, zinc-aluminium (Galfan) and PVC-coated mesh are different products with different lives in the same ground, and the choice follows the exposure. Specify the coating class against that exposure rather than specifying "a gabion".
- •Fill grading is a specification, not a preference. Stone that can pass the mesh aperture will migrate, and the face will slump — fill is normally specified well above the aperture size.
- •Recycled concrete or brick arisings are a legitimate fill and the strongest circularity argument for a gabion, but they are softer and more variable than quarried rock. Durability and appearance both follow the fill.
- •No figure is held on this record. Mesh manufacturers publish declarations for mesh; no declared unit describes a filled wall, and the dominant term is usually how far the fill was hauled.
Design & Specification Notes
Rock or crushed arisings packed into wire baskets and stacked as a gravity wall.
Material Note
The stone is held by a steel cage rather than by mortar or by a waller's skill, and that swap is the whole record. The stone is inert mass; the steel is where the process energy sits and what sets how long the wall stands. So the coating specification, not the stone, is the decision — and filling with recycled arisings is the strongest version of the material.
Typical Uses
- •Planting systems
- •Biodiversity zones
- •Outdoor amenity
Key Performance
Supports biodiversity and surface water management.
Typical Service-Life Estimate
30 yearsSpecification Actions
- •Specify the mesh coating class against the real exposure — coastal air, de-icing salt and acidic ground all shorten a galvanised life sharply.
- •State the fill grading relative to the mesh aperture. Stone small enough to pass through will migrate and the face will slump.
- •Establish whether the fill can be site-won rock or recycled demolition arisings; haulage dominates the impact otherwise.
Indicative Health & Indoor Air
Inert stone in coated steel. Cut wire ends are a handling risk while it is being built, not an in-use one.
Products in this category
3 products from 2 manufacturers. Ordered by the evidence each record holds, never by commercial standing.
Specification
- Finish
- Stone-filled steel mesh baskets