Hi Tia,
I grew up in Galveston, which is an island on the Gulf, and humidity and mold were huge problems. We had a dehumidifier in a few rooms, but also had these plastic jars with screw on lids that we would put in each closet. They had some material in them that actually absorbed water. We had to pour them out every so often. You might be able to put some of those right next to your cardstock storage, or even in the cabinets. Hope this helps! Save those little silica or dessicant baggies you get in your shoes, etc. too, for the paper bins you have. I did a search and found this website:
http://www.amazinghomeproducts.com/s...TOKEN=58800608
There are tons of them, though..you might find a better one.
Ideas for storing 12x12 paper in a humid/damp environment
