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When welded in place, these strut wires pierce through a modified
expanded polystyrene core placed between the two layers of welded
wire fabric, maintain the required distance apart and provide the
shear transfer between the panel surfaces.
The modified expanded polystyrene core (minimum density 0.9 pounds
per cubic foot) is held 1/2" or 3/4" from each face of the wire
frame to permit the wire to be embedded in an application of
approximately 1" - 2" thick concrete mixture with 2,500 psi
minimum.