Several pieces that have been in my basement for some time. In good unused shape, I thought I'd use them for something else but that hasn't happened. No sign of water on them. Hopefully someone else can put them to use; I can put them at the end of my driveway for pickup.
3/8" x 32.75" x 57"
3/8" x 19.5" x 35.5"
1/4" x 24" x 48" (two of these)