and lower faces of the panel become tacky and pliable as shown in fig3 a the lamps heat the surfaces of panel 12 to at least 325 u00b0 f although temperatures greater than 325 u00b0 f are permissible temperatures in excess of 400 u00b0 f will cause the foam panel to shrink away from the mesh layer after the heating operation panel 12 is advanced into operative relationship to press 34 as shown in fig3 b layer 14 of wire mesh is inserted into the press and then the press moves downwardly and securely embeds the mesh in the foam panel press 34 must exert a load at least one pound of pressure per square inch in order to permanently embed the mesh and the mesh must be embedded to a depth of at least one half of its overall thickness for optimum results excessive pressure however will cause a permanent reduction of the overall thickness of the assembled board after layer 14 is firmly embedded in panel 12 the panel is inverted and the second layer 16 of wire mesh is embedded into the exposed surface of panel 12 as indicated in fig3 c here again a minimum load of at least one pound of pressure per square inch is.