Isn mold happening now because buildings are too tight?
This rationale for moisture/mold problems is often presented by the media as the main driving force for the current rash of moisture/mold claims. However, mold needs moisture to grow and moisture can come from lots of sources in a house, many of which have nothing to do with the amount of fresh air exchange a building experiences. A chronic plumbing leak releasing water onto drywall or a leaky foundation wall are a couple of examples. There can indeed be cases where the humidity level in a house would be lower with more fresh air, potentially alleviating some moisture/mold problems but to characterize this as the root cause of mold problems is incorrect.
