Welded wire mesh, or welded wire fabric, or "weldmesh" is an electric fusion welded prefabricated joined grid consisting of a series of parallel longitudinal wires with accurate spacing welded to cross wires at the required spacing.

Machines are used to produce the mesh with precise dimensional control. The product can result in considerable savings in time, labour and money.
https://en.wikipedia.org/wiki/Welded_wire_mesh


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Note added at 3 hrs (2019-09-28 10:59:42 GMT)
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Najprawdopodobniej, podkład podłogowy odnosi się do concrete slab reinforcement.

Welded wire fabric (WWF) for concrete slab reinforcement
This type of mesh is a square grid of uniformly placed wires, welded at all intersections, and meeting the requirements of ASTM A185 and A497 or other standards.[1] The sizes are specified by combining the spacing, in inches or mm, and the wire cross section area in hundredths of square inches or mm2. The common sizes are in the following table:
https://en.wikipedia.org/wiki/Welded_wire_mesh