I live in St. Louis and have a large comic book collection in the basement. My dehumidifier runs year-round at around 40% and that seems to be good enough. I've never noticed anything going on with the paper down there.
That being said, the silica mentioned earlier in this thread is a very good idea for boxes that contain your good cards. I wouldn't worry about slabbed. They're waterproof and should survive most anything.
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Past transactions with ALR-Bishop, Fleerfan, Leerob538, Northviewcats, wondo, EconTeachert205
"Collectors were supposedly enjoying the pure hobby of baseball card collecting, but they were also concerned with the monetary value of their collections." House of Cards by John Bloom, 1997.
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