Radiant barriers are great tools for reflecting heat back into your conditioned space. Conditioned space is the part of your home you live in and pay to heat/cool. However, to be effective, barriers must be installed so air is able to move on both sides of the barrier. In this crawlspace, the radiant barrier was attached to the ceiling of a crawlspace with insulation between the barrier and the home. This allowed for no air movement on one side of the barrier. This is what caused the condensation to form on the underside of the barrier. Added moisture in your crawlspace causes wood rot, mold growth, attracts bugs and makes your home an allergy or asthma attack waiting to happen. If you have a radiant barrier installed like this in your crawlspace, Dr. Energy Saver will come out for free to give you an estimate of the possible damage caused and the most cost effective solution to get your home back into shape.