Abstract: A method and apparatus for forming a concrete foundation wall. A trench is opened in the ground and a form is inserted into the trench. The form is made up of a pair of spaced-apart opposing panels, which define a cavity. The panels may be made of a thermal insulating material, which may be extruded foam insulation or, more particularly, extruded polystyrene. The panels may be supported through a combination of J-channels, spreader brackets, connecting members, and a support member. The method further includes backfilling the trench around the form with dirt and pouring concrete into the cavity. The dirt provides support for the form as the concrete is poured.