Anti-Bird Welded Mesh Panels Specifications: What to Put in Your RFQ

A specification for anti-bird welded mesh panelss is only useful if it is unambiguous to someone who cannot see your project. Most disputes on this product do not come from bad manufacturing — they come from a drawing that could reasonably be read two ways, where the supplier read it the cheap way and the buyer read it the expensive way.

This is a practical specification checklist, written around what the standards actually require.

The three specification families you will meet

Suppliers will quote against whichever family your market uses, and the part can usually be built to any of them:

• ISO 9227 — salt spray for the coating system.
• ASTM A641 — zinc-coated wire reference.
• EN 10223 reference — woven and welded wire fencing requirements context.

The mistake is to specify a standard reference without specifying the class or grade within it. If you write only the standard number, the supplier will quote the lowest class that satisfies it. Write the standard and the level you want.

Dimensional data that has to be on the drawing

For this product the critical dimensions are: mesh 6–13 mm (sparrow-proof) up to 25 mm; wire Ø 0.5–1.2 mm; sheets 1×30 m rolls or cut panels to size.

Three rules that prevent most dimensional disputes:

1. Give tolerances on every functional dimension, not just the nominal values. A nominal dimension with no tolerance is legally “as the supplier chooses”.
2. Say which dimensions are functional and which are cosmetic. Suppliers prioritise what you prioritise, and they cannot guess.
3. State the gauge or measuring method where a dimension is critical. Two inspectors with different methods will disagree about the same part.

Material and grade

The base specification is galvanised or stainless welded mesh, PVC-coated or bare. Grades commonly offered include:

• galvanised + PVC-coated (standard)
• AISI 304 welded (ventilation / plant rooms)
• AISI 316 (coastal)
• powder-coated black for visible façades

Ask the supplier to state the grade on the quotation, not on an assumption. Grade substitution is the single most common silent cost reduction, and it is usually invisible in the finished part — a 201 stainless component looks exactly like a 304 one until the second winter.

Surface treatment

The usual finish for this product is PVC coating 0.4–0.6 mm after coating; black, green, grey; stainless left bare or powder-coated.

Two points worth writing into the order:

• A measured requirement, not a process name. “Hot-dip galvanised” is a process; “70 µm minimum, tested by coating mass on three parts per batch” is a requirement.
• What happens at cut edges and drilled holes, if any. These are where coatings are habitually broken and where corrosion starts.

Type tests and routine tests

These are different things and are frequently confused in quotations:

• Type tests qualify the design once. On this product: weld shear strength sampling; coating adhesion mandrel wrap; salt spray 720 h (coated).
• Routine tests are run on every batch: mesh aperture audit — the aperture, not the wire, is what excludes birds.

Specify which type-test reports you want supplied as documents, and which routine test results must accompany each shipment. On a first order, ask for the type-test report before you place it.

The failure modes your specification should be closing

• Coating flaking at the cut edges — mesh galvanised after welding but coated before shearing; every cut edge is bare steel and rusts a halo in one winter
• Mesh distorting when cut to size — thin wire (under 0.6 mm) on a wide aperture; the panel goes rhomboid as soon as the shear touches it
• Aperture drift — loom tension wrong; nominal 6 mm mesh runs 8 mm in places and sparrows walk through

Each of these can be turned into one line in the specification. That is the real purpose of writing it out: not bureaucracy, but making the specific failure you are worried about somebody’s explicit responsibility.

A specification skeleton you can reuse

1. Scope: Anti-Bird Welded Mesh Panels to be supplied as bird proofing mesh, welded wire bird mesh, stainless bird mesh, ventilation bird guard mesh.
2. Dimensions and tolerances: mesh 6–13 mm (sparrow-proof) up to 25 mm; wire Ø 0.5–1.2 mm; sheets 1×30 m rolls or cut panels to size.
3. Material: galvanised or stainless welded mesh, PVC-coated or bare; grade galvanised + PVC-coated (standard) or better.
4. Standard: ISO 9227 — salt spray for the coating system; ASTM A641 — zinc-coated wire reference; EN 10223 reference — woven and welded wire fencing requirements context.
5. Finish: PVC coating 0.4–0.6 mm after coating; black, green, grey; stainless left bare or powder-coated.
6. Tests: weld shear strength sampling; coating adhesion mandrel wrap; salt spray 720 h (coated); mesh aperture audit — the aperture, not the wire, is what excludes birds.
7. Marking and packing: rolls in woven bags; panels interleaved on edge in cartons.
8. Inspection: pre-shipment, against this specification, with photo evidence and test records.

Related: the anti-bird welded mesh panels quality inspection checklist turns this specification into an inspection plan you can hand to a third-party inspector.