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JLC · MARCH 1988 Miscellany To insulate a foundation on the exterior normally involves many steps. After the forms are stripped, the foam insulation must be cut, fit, and fastened either mechanically or with an approved glue. Then — if the material survives the beating it usually takes during construction and backfilling — it must be covered and flashed to protect it from the weather, ultraviolet light, and physical damage. But a new product from Gentrex Corporation promises to change all that. The core, Dow Styrofoam SM, is covered with a special PVC facing, and functions both as the concrete form, and the perimeter insulation material. With System 150, you dig the trench, install the insulated concrete forms and pour the concrete. And that's all. According