Basements by far are the most damp section of just about any home. Often used for storage they are forgotten quite literally until a problem arises.
As your home settles, tiny fissure cracks develop in the walls, letting even more moisture into the basement or crawl space.
While mold can be very obvious at times, there are several areas of a basement that you may not be able to see the mold. This is especially true if you have partially or fully finished the basement for additional living space such as a rec room, TV or play area for your children.
If you have a finished basement and your family spends a good deal of time in it, you certainly want to ensure it is a healthy environment, don't you?