1/8" neoprene gasket material cut into ribbons glued onto the top of the ribs with contact cement (just dab the cement every 8" or so to hold the strips in place until the floor is pop-riveted in place). Rolls of neoprene in varying widths can be had at any gasket supply house. It is not cheap but will be permanent. Lesser materials will eventually rot and your rivets/deck will be loose and rattle worse than ever. Neoprene has excellent vibration dampening properties. Acadiana Gasket and Rubber in Lafayette has it but with all the refinery industry in your area I'm sure you have a gasket supply Co. nearby.
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