Abstract: A cover panel system for a vessel having an opening includes a plurality of individual panels arranged adjacent each other and spanning at least a portion of the opening. Each panel is generally polygonal in shape and has a depending side wall depending from each polygon side. Each panel is supported along at least one depending side wall across the portion of the opening. The side walls of adjacent panels facing each other and define a gap--between them. A compressible seal is located in the gap between the side portions of adjacent panels for tightly sealing the facing side portions of adjacent panels. Adjacent panels are removably interlocked together.

Abstract: Preformed panels having a layer of insulation secured to the rear surface of a facing layer are retained in position against a wall by horizontally disposed banding having resiliently coupled ends. A vertical member along one side edge portion of a panel has a spring portion terminating in a flange angled outwardly away from the facing sheet so that a side edge portion of the next adjacent facing sheet may be inserted therebetween and clamped against the facing sheet of the first panel to thereby interlock adjacent horizontally disposed panels.