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maybe you are thinking too quickly, lol, water intrusion goes on all the time, sailingdog, with fiberglass boats as you probably know. a boats hull absorbs water unless epoxy coated etc. That is why they "blister": water intrusion!- this is because the (often vinyl ester) resin matrix is porous and will osmotically as well as just by mechanical pressure be takingn on water until it is saturated... the saturation point depends on the reference gradient- this is why I say southern california boats will typically have less problems with deck core problems- the humidity is generally a lot less than other places, portland, or for instance. thus you would expect anything, including your deck core, to maintain, over time, an internal moisture content similiar to the average humidity. that is why we find old cars sitting around here that have not rusted to the ground whereas in hawaii for instance you can park a car on the side of the road and it won't be there a few years later! the extremely high humidity is pushing water into anything that is not a similar 80-90% humidity.
If someone had a boat that was damp and put it in a very low humidity environment, like a giant refridgerator, it would lose moisture until it was as dry as the air around it.