We are in the process of hiring someone to look into this....just thought I would get other opinions, because everyone seems to have one, and they range from slab issues to poor circulation, and even roof leaks. We had our roof checked for leaks and there were none. When I said that it was "obvious" the previous owner had tried to hide the mold I meant that we are finding areas in the house that were painted over and covered (trying to hide the mold). So I believe that this was an issue before we purchased the home No, we do not use a humidifier, and yes we do use the vents in both bathrooms and the kitchen and our laundry room is located outside along with the hot water heater. We installed insulation because we noticed one day (when the weather turned cold) that our walls were wet and mold was growing on the baseboards. So the mold was there before the insulation was installed. We don't have a problem w/moisture on our walls now.....its only on the floors. Yes, the insulation was faced and it was installed correctly. We were told that we needed roof ventilation and that this would solve the problem. Once we figure out, and solve the issue.....will the mold stop growing or will some type of remediation need to be done?