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In the morass of insulated concrete forms, Lite-Forms are notable for their versatility. The forms are made of 8-inch x 8-foot strips of 2- inch extruded polystyrene (a 2-inch, 2 pound density beadboard can be substituted). These "form boards" are assembled horizontally using plastic form ties which resemble snap ties with a flattened, square end that reportedly holds a drywall screw well. This square end should simplify finishing off interior walls, and above-grade, exterior walls. The forms come knocked down or in preassembled sections with preformed corners. Full-wall forms need additional bracing on one side. With insulation on both sides, the wall is rated at about R- 20. The forms can be reused, on one or both sides, if you opt