Now that I'm running my wood stove almost 24/7, I'm getting a little nervous about freezing up the baseboard heating that runs through my granite and fieldstone foundation. I went to a home show where there were venders for spray in foam insulation and claimed they could insulate my stone foundation. Has anyone had this done, and how did it work out ? I also noticed that there are a couple different types of foam; open cell, closed cell, soy based, urathane and probably something else too. Is one better than the other ?