I'm no expert on the subject, but I have been through it with two of my homes on several occassions. There are a lot of factors that could contribute to the water getting in there .. making sure the grade around the house is correct, ensuring gutters are clean and working and that downspouts are depositing water well past the grade away from the house, sump pits (and making sure they're in the right spot, or also possibly needing to install a second one). The grade around your neighborhood in general can even have something to do with it.
It is my opinion, though, that I would not install flooring until you are sure you've got this licked. Otherwise, you're just wasting money on flooring that will most likely be ruined within the near future. Doubling up the bottom plate on your walls won't hurt anything, but it won't really help anything either.
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