Join Date: Dec 2005
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I have a spot on my boat that sounds similar to your situation. In my case, there is one spot about 4 - 6 inches in diameter which crackles a bit when I step on it the first time--if I move and immediately step on it again, it doesn't make that sound, but it will after some time has passed. There are no fittings around it, so it's very unlikely that water has gotten in there, and otherwise the boat is in excellent condition. It is not at all soft or spongy, and doesn't look any different from the rest of the deck. I have shone a light at it from inside the boat, and that spot doesn't look any different--ie. not more dense, opaque, etc. I asked several knowledgeable people about it, and so far they have each (independently) said that it doesn't look/sound like deck delamination. One said it's kind of like a creak in the floor of a house. All have said I shouldn't worry about it.
I wonder if your situation is similar--perhaps just one of those anomolies. On the other hand, if there is any sponginess or sign of dampness, then that's a different story altogether, needing repair.
I'll be interested in what others suggest.