I have stored fabric on the cardboard bolt boards, and living in humid delaware, my fabric got a musty odor as there is no air conditioning in the walk in closet in the attic ( we now have a vent in there) and the cardboard attracted moisture. I am in the process of removing the bolt boards and using coroplast, it works well. DH cuts them for me in the right size. Hoping that Home Depot or Lowe's will still carry it. It was out of stock the last time we looked.