I live in Upstate NY. I have a breezway that connects my kitchen and garage. It has a concrete floor. I want to convert this space and use it year round. I want to put a floor over the top of the concrete but I need to first isolate the moisture in the concrete. I'm afraid if I just lay a vapor barrier down over the concrete, I will end up with mold on the underside of the vapor barrier which will eventually find it's way into the space. Any suggestions? Also, what is the best (highest R value) to use?