I need to make my basement a functional space for a office for my at-home businesses. It has a concrete floor, but has stone walls that shed grit. I'm thinking of putting those thin sheets of look-a-like panel board over them - is this a good idea? I know it gets humid down there in the summer and I don't want a mold problem...Any suggestions from all those of you who have stone walled basements from the mid 1800s?!