Insulated structure

An improved insulated structure, the structure comprising an inner structure having a convex curved surface, a plurality of sheet metal bands secured to the convex curved surface by a plurality of band retaining means affixed to the convex curved surface, at least some of the bands being disposed in generally parallel relationship, at least some of the bands having disposed thereunder malleable sheet metal blanks containing regions where the blanks are bent to form legs extending away from the surface, a plurality of insulating panels disposed on and generally conforming to the convex curved surface, the legs of said blanks being bent over adjacent insulating panels thereby retaining said insulating panels in position.