Abstract: A method and associated device for forming reinforced panels including providing a first panel of insulation having two major surfaces, piercing the insulation panel with rod like members so that portions of the rod members extend out from both major surfaces, superimposing on each major surface a grid formed from a plurality of longitudinally and latitudinally extending bar members which are formed by attaching the bar like members at intersections thereof and orienting the grid and additionally the rod like members so that some of the rod like members contact different bar like members which are thereafter welded to form a reinforced panel.