I am in the process of finishing my basement. The house is 3 years old and thus far it seems to be a very dry basement. I am planning on carpeting most of the basement floor and I'm toying with how to deal with the concrete floor prior to laying the carpet? I was going to seal the concrete with a sealer and then use a rubberized underlay. Is this recommended? Is there a stong need to put down a subfloor instead? If not, do I necessarily need to seal the concreate prior to laying down the underlay? Any advice would be greatly appreciated.