I had the same symptoms with my boat and decided to cut out the affected areas and try to do those areas only. But when I cut into it I found that the more I looked the worse it got. Came a point that 90% was wet and soggy wood. I did fix a small area and patched it back up just so I could get one more summer out of it, but knew that it was only temporary. Decided to do the whole floor used nida core. And I estimated that the old wet wood weighed at least 200 lbs. The hatch over the floor was at least 100 apart from the floor. Now it goes 30lbs . I imagine that the boat with all the weight off of it will run a lot better.
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