How Do I determine if the moisture problem is in the finished floor or the sub floor?
In order to find this out, you must use a pin type meter with insulated contact pins. First, take several readings in the layer just below the surface; then make a series of core readings, closer to the center of the board thickness. After you have noted these readings, hammer the pins through the flooring material until you make contact with the sub floor. If your readings throughout this process are uniform, then there is not a moisture problem. If readings increase as you go further into the floor, and again in the sub floor, this indicates that the sub floor is a source of moisture.
