prefabricated exterior panels and slab foundation systems are disclosed for use in an integrated simple design procedure for use in low - energy use buildings . the panels include a frame formed from conventional framing methods , an inner layer of sheathing fastened to an outer side of the frame , a layer of insulation adhered to an outer surface of the inner layer of sheathing without using fasteners , and an outer layer of sheathing adhered to an outer surface said layer of insulation without using fasteners . sets of panels are formed with openings for windows or doors . jigs are used for constructing the panels including corner panels .