We've been in our house for just under a year, and during some heavy storms in Feb and March we got a few inches of water in the basement. The basement was partially finished with drywall, so I had to go around and remove the bottom 24" to get rid of the soggy/moldy stuff.
I have since addressed the water problem by installing a sump pump, and it worked like a champ during another huge storm we had a few weeks ago. The water level never rose above 8" below the slab. Of course, when you depend on a pump you can never be 100% sure that you'll stay dry. What if there's an extended power outage... the battery backup runs out... the generator won't start? You can be 99% certain but never 100%.
I'm looking for options for a waterproof wall covering (not just moisture resistant), so that if this ever happens again I don't have to repair the walls again. I don't think there is any drywall product that would work, but I could be wrong.
One thought we had was to replace the bottom 24" with CBU, and then cover the CBU with 36" wainscoting (overlapping the drywall). I found a PVC-based product called PolyMAX Wainscot that should work. However, I'm not sure if we want to install wainscoting, at least not everywhere.
Can anyone suggest other waterproof options? How would plaster over CBU hold up? Are there other products aside from CBU that we should consider?