My home inspector used a moisture detector on a tile basement floor of a house built in the 1920s. The house is structurally sound with very few problems.
The inspector found moisture in some very specific/small areas of the basement tile floor. Tiles nearby gave either very low or no moisture levels. The infrared camera reading was inconclusive in this area. There was a water leak in the home in 2011 that was repaired and all walls in the basement tested dry. There is a small crack/heave in the tiles in this area, but the owners insist that this crack has been here for a long time. There is currently a hole in the roof flashing that is allowing low moisture levels in an upstairs room.
My question is: How likely is it that the moisture detector was sensing some sort of reflection off of the tiles given that the infrared camera could not detect moisture? In that the moisture levels were found in such a small area, how likely is it that this could cause major problems in the future? Last, is it possible that a roof leak is causing problems in the basement floor only (and not the walls)?
Thanks so much for any advice on this topic!