a forming panel and method for using the same in construction of self - sustaining concrete wall structures is provided wherein a flexible barrier element is provided along a margin on the forming panel for impeding the flow of water and fine particles of a concrete mix pour past the barrier element . the margin may be along the perimeter edge of the forming panel or along an opening interior to the perimeter of the forming panel . when located near the perimeter , the flexible barrier element may be positioned in a slot extending parallel to the margin and located in the frame . when located near an interior opening , the barrier element may be provided on a reinforcing member positioned around the opening or on a door which shifts to improve access through the opening during placement of forming ties or the like . the forming panel may be coupled with adjacent forming members to provide a wall system , and two wall systems may be connected by forming ties to provide a channel for receipt of a concrete pour therebetween .