When might Welded Wire Fabric be preferred over separate bars?

• A. In slabs where uniform crack control and rapid placement are desired, especially in thinner slabs.
• B. In columns subjected to high shear.
• C. In slabs with extreme long-span loads.
• D. In exterior walls requiring rust resistance.

Answer: (A)

Welded wire fabric is ideal for slabs that need uniform crack control and quick placement, especially when the slabs are thin. The mesh is pre-assembled into a single grid with evenly spaced wires, so reinforcement is distributed consistently across the entire area. This helps keep crack widths small as the concrete cures and carries load, and it dramatically speeds up installation because you can lay the mesh in place and pour without tying many individual bars. For thinner slabs, this combination of uniform reinforcement and rapid placement is a practical and economical approach.

In other situations, different needs come into play. Columns subjected to high shear require specialized transverse reinforcement and stirrups, which WWF can’t provide effectively. Long-span slabs demand higher flexural capacity and may need larger or differently spaced bars to resist bending. Exterior walls that must resist corrosion often require coated or otherwise protected reinforcement.