A basement is usually one of the most isolated places in the house, typically characterized by unhealthiness, mold presence, and unnecessary moisture. It is true that the basement is subject to a lot of risks and adversities.
The basement is, by nature, subject to moisture. Basements are located under the ground level in most of the times, and this means they are surrounded by earth which is typically very wet almost all the time. During the winter when it is cold, the area above tends to freeze, making it a near-perfect victim of condensation and frost accumulation.
If your walls are poorly sealed, the frost, which tends to melt during springtime, will let the water run down the walls and to the floor causing you to think that your basement is leaking.
This water that is unaccounted for makes perfect breeding ground for mold and mildew. All this can be avoided when you perform a spray foam insulation on your basement.