Abstract: Foam forms for use in making a concrete wall are disclosed together with a method of making the forms. The forms are stackable to form a cavity that receives the concrete. Each form has two identical panels. The panels are molded separately by first placing a structure, consisting of backing plates that will be along one side of the mold, connecting members that will be along the opposite side of the mold and an apparatus that connects the backing plates to the connecting members, in the mold. The mold is then filled with foam which cures and produces a panel with the backing plates, connecting members and apparatus molded into the panel. The molded panels are then shipped to the job site where the forms are assembled. Each form is assembled as follows: The connecting members on one panel are interconnected, by tieing means, to the connecting members on a second panel to provide a form.

Abstract: Concrete formwork is provided comprised of a plurality of panels with backing plates tied together by tie wires or metal ties. In certain embodiments of this invention the panels are comprised of a material having a high insulating ability, but having relatively poor strength capabilities. Examples of these materials are polyurethane, polystyrene, and other foam plastics. The panels are arranged in a plurality of panel assemblies wherein each panel assembly includes a pair of panels spaced horizontally and tied together. The panel assemblies are arranged one on top of the other and end to end to form a complete wall. The panels have shiplap joint edges so that the joints between the panels interlock and are not in a single plane. The panels can be easily manufactured on the site by a plastic foam producing machine and a molding machine. The backing plates and metal ties or tie wires can be molded in place when the panels are molded.