How to read welded wire mesh sizes - Mid Continent Steel and Wire

Reading welded wire mesh sizes can be a bit technical, but it’s important for understanding how to use and specify it for your construction needs. Here’s a breakdown of how to interpret them.

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What are the different sizes of wire mesh?

1. Numbering system: The new system uses a letter-number combination to designate wire sizes: “W” represents smooth wire, “D” represents deformed wire. The number following the letter indicates the cross-sectional area of the wire in hundredths of a square inch.

2. Wire Mesh Designation: Welded wire fabric is designated by four components: two numbers representing the spacing of longitudinal and transverse wires and two letter-number combinations representing the type and size of longitudinal and transverse wires. For example, in “6 by 8—W8.0 by W4.0”, 6: spacing of longitudinal wires, 8: spacing of transverse wires, W8.0: smooth wire with 0.08 square inch cross-sectional area (longitudinal), W4.0: smooth wire with 0.04 square inch cross-sectional area (transverse).

3. Common stock sizes: Here are some examples:

Rolls

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– 6×6—W1.4xW1.4 (formerly 6×6—10×10)
– 6×6—W2.0xW2.0 (formerly 6×6—8×8)
– 6×6—W2.9xW2.9 (formerly 6×6—6×6)
– 6×6—W4.0xW4.0 (formerly 6×6—4×4)
– 4×4—W1.4xW1.4 (formerly 4×4—10×10)
– 4×4—W2.0xW2.0 (formerly 4×4—8×8)
– 4×4—W2.9xW2.9 (formerly 4×4—6×6)
– 4×4—W4.0xW4.0 (formerly 4×4—4×4)

Sheets

– 6×6—W2.9xW2.9 (formerly 6×6—6×6)
– 6×6—W4.0xW4.0 (formerly 6×6—4×4)
– 6×6—W5.5xW5.5 (formerly 6×6—2×2)
– 4×4—W4.0xW4.0 (formerly 4×4—4×4)

How does welded wire strengthen projects?

There are many ways in which welded wire mesh can enhance the strength of your project. Here are some of them:

1. It evens load distribution: Welded wire mesh helps distribute loads and stresses evenly across the concrete surface. By spreading these forces over a larger area, it reduces the likelihood of localized stress concentrations that can lead to cracking or failure.
2. Adds tensile strength: Concrete is strong in compression but weak in tension. Welded wire mesh, made from steel, provides tensile strength that concrete lacks. When concrete is subjected to tensile forces, the steel wires within the mesh help resist these forces, preventing cracks and structural failures.
3. Crack control : As concrete cures and dries, it is prone to shrinkage and thermal expansion, which can cause cracks. The welded wire mesh helps control and limit these cracks by holding the concrete together. Even if cracks do form, the mesh helps prevent them from widening or compromising the structure.
4. Improved bonding: The wire mesh is embedded within the concrete, creating a strong bond between the two materials. This ensures that the mesh effectively contributes to the structural performance and remains integrated with the concrete as it cures and hardens.
5. Prevents deformation: In structural elements like slabs, beams, and walls, the welded wire mesh helps resist bending, shear forces, and other stresses. This reinforcement is especially critical in areas subject to heavy loads or dynamic forces.

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