IS 1566:1982 is the Indian Standard (BIS) for hard-drawn steel wire fabric for concrete reinforcement. This standard prescribes the requirements for hard-drawn steel wire fabric (welded wire mesh) used as reinforcement in concrete. It details the manufacturing process, dimensional tolerances, physical properties, and specific testing methodologies like tensile and weld shear tests.
hard-drawn steel wire fabric for concrete reinforcement
Key reference values — verify against the current code edition / project specification.
| Reference | Value | Clause |
|---|---|---|
| Product | Hard-drawn welded wire fabric for RCC reinforcement | Scope |
| Value | Speed + consistent spacing & cover | Application |
| Integrity in | Weld-intersection shear strength | Critical |
| Continuity | Lap sheets (specified meshes) — top field error | Critical |
| Ductility | Hard-drawn = lower ductility than IS 1786 bar | Caution |
| Cover | On chairs/spacers — not on the ground | Caution |
| New work | Cite current fabric spec (IS 16088/current) | Cross-ref |
IS 1566:1982 is the specification for hard-drawn steel wire fabric for concrete reinforcement — factory-made welded wire mesh from hard-drawn wire, used to reinforce slabs, pavements, screeds, precast panels and walls. It is the established 'reinforcement mesh' material; the newer IS 16088 covers welded plain/deformed wire fabric on similar principles.
It sits in the reinforcement stack:
Welded fabric replaces hand-tied bars with a factory grid — its advantages and its acceptance properties:
The engineering point: fabric's value is consistency and speed, but it must be lapped for continuity (overlap the specified number of meshes) and supported on chairs for real cover — the recurring field errors are short laps (discontinuous reinforcement) and mesh laid on the ground (no cover). And because hard-drawn wire is less ductile than IS 1786 bar, its use must respect the IS 456 design context. For new specification, the current fabric standard (IS 16088/current) should be cited.
Scenario: a ground slab / pavement reinforced with welded wire fabric.
Step 1 — design the steel area (IS 456): required area/spacing → select the fabric mesh designation (wire dia, pitch).
Step 2 — verify acceptance: wire strength, mesh geometry and weld-intersection shear strength per the fabric spec (current standard).
Step 3 — laps & continuity: lap sheets by the specified number of meshes so the reinforcement is structurally continuous (the No. 1 fabric error is short laps).
Step 4 — cover: support on chairs/spacers for correct, consistent cover — *don't* lay mesh on the subgrade.
Step 5 — accept per IS 456; note hard-drawn wire's lower ductility in the design context.
Properly lapped fabric on chairs gives fast, accurate, durable reinforcement; short laps or no cover make it a discontinuous, unprotected grid.
1. Inadequate sheet laps. Fabric must be lapped (specified meshes) for continuity — short laps = discontinuous reinforcement.
2. Ignoring weld-intersection strength. The welds are the fabric's integrity — a flimsy grid is not engineered fabric.
3. Mesh on the ground / no chairs. Destroys the consistent-cover advantage and durability case.
4. Ignoring lower ductility of hard-drawn wire. Less ductile than IS 1786 bar — respect the IS 456 design context (esp. where bending/ductility matters).
5. Citing a superseded fabric standard. For new work cite the current fabric spec (IS 16088/current).
IS 1566 is reaffirmed and is the established hard-drawn welded wire-fabric reinforcement spec (read for new work with the current IS 16088/fabric standards). Its productivity-and-quality value is real — a factory grid gives consistent spacing and cover that hand-tying rarely matches — but it works as reinforcement only if two things hold: weld-intersection strength (the welds are the fabric's structural integrity) and proper sheet lapping (short laps make the reinforcement discontinuous — the commonest field failure), with chairs to deliver real cover. One extra discipline versus bar: hard-drawn wire is stronger but less ductile than IS 1786 rebar, so its use must respect the IS 456 design context. Specified from the steel-area requirement, lapped and chaired correctly, and accepted on weld/wire properties, fabric is fast and durable; treated as 'some mesh thrown in', it neither reinforces nor lasts.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Yield/Proof Stress | 480 MPa (0.2% Proof Stress) | 550 MPa (Yield Strength) | ASTM A1064/A1064M (Grade 80) |
| Minimum Tensile Strength (for ~5mm wire) | 570 MPa (as per IS 432 Pt II) | 620 MPa | ASTM A1064/A1064M (Grade 80) |
| Wire Type Specified | Plain, hard-drawn wire only | Plain and Deformed wire | ASTM A1064/A1064M |
| Weld Shear Strength | 50% of wire's minimum breaking load (for structural fabric) | Force (lbf) ≥ 35,000 x Area (in²) of smaller wire | ASTM A1064/A1064M |
| Strength Grade Basis | Based on hard-drawn wire properties from a separate standard (IS 432) | Defined by specific strength grades within the standard (e.g., Grade 500 in BS 4483) | BS 4483:2005 |
| Ductility Class | Not explicitly defined; ductility implied by bend test | Specifies different ductility classes (e.g., Class L for low ductility mesh) | AS/NZS 4671:2019 |