Welded wire reinforcement (WWR)
A grid of steel wires welded at intersections, supplied in sheets or rolls, used to control cracking in slabs on grade.
What does welded wire reinforcement (wwr) mean?
Flat sheets hold position far better than rolled mesh, which springs back and is difficult to place accurately. Like rebar, wire reinforcement does not prevent cracks; it holds shrinkage cracks tight so they do not open, spall, or lose load transfer. Placed on the ground and never lifted into position, it does nothing at all.
In practice
Mesh found lying flat on the subgrade after a slab is cored is one of the most common findings in residential slab investigations.