Greatwall insulated panel systems are applied to cold storage and freezer store construction, their primary and original manufactured usage. As the construction industry has discovered the product is a versatile and affordable product, the refinished product has many more application, i.e.. clean rooms, completed factory and office cladding-walls and roofing, factory and office partition walls, food manufacturing plants, controlled environment rooms, trafficable suspended ceilings, office cabin, ready-made toilet partition and housing industry.