the pin 98 then passes through the hole of the tie bar 52 and through the gate 66 to both hold the door 82 in the closed position and secure the forming panel 10 to the tie bar 52 thereafter dry concrete mixed with water may be poured into the channel 126 which after a suitable curing period hardens the barrier elements 30 substantially inhibit the flow of water and fine particles of mortar sand and the like from the concrete 54 while it cures the barrier elements 30 along the side rail and end rail edges oppose one another as shown in fig5 to inhibit substantial flowing of material without inhibiting the performance or coupling ability of the forming panels the bristles 34 yield when engaged by tie bars 52 or the frame 14 and being separate resist tearing while providing a substantial barrier to the flow of water and fine particles from the concrete the flexible barrier elements are especially beneficial in resisting flow of water and fine particles both when a tie bar 52 is present in a relieved area 50 or even more importantly when a tie bar 52 is not used in a relieved area as shown in fig7 when an opening 60 is provided in the forming panel interiorly of the perimeter provided by the frame the door 82 is able to swing open to ease the placement of the tie bar after the tie bar 52 is in place the door may be closed to inhibit the flow of concrete.