Is your floor plywood with a carpet on top? Best bet would be marine plywood, then treated plywood - go for the quality stuff too. Most of what I've also seen is that you need to apply a resin finish on both sides and the ends. This will prevent if from prematurely rotting... Intersting on my old boat (Sea Ray), it had a plywood deck with acarpet attecjed - it was just getting spongy after 5 years. Not bad, just barely perceptible. Would not have happened if it were properly sealed...
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