Insulating A Basement Wall With Foam Board - There are several ways to help prevent moisture damage problems in a basement. The first guideline is no dirt basements. Although these are less prevalent in this day in age, it's good to point out this dirt flooring not only hold a large amount of moisture but also can give off a number of gases. When building a basement, make sure you have a floor drain with a trap installed in the bottom point of the ground.
With no floor drain, any water that is spilled inside cannot escape. If necessary, install a sump pump and ensure that the sump cover is tightly sealed. Sump pumps are usually used where flooding due to a high water table might be a issue. In addition, waterproof the outside of the foundation walls and install a perimeter drainage system. A frequently overlooked problem in bathrooms is moisture that comes out of humidity.
The simplest way to control humidity would be to exhaust water vapor produced in the home to the outside. Indications of high humidity include condensation on walls, pipes or other surfaces as well a general awareness of moisture from the air, dampness, and smells. Many times, the humidity is going to be caused by exposing the basement to outside air (open windows), having wet laundry hung to dry from the basement, storing firewood from the basement, and/or a dryer vent that exhausts indoors.
In summer, use a portable dehumidifier or air conditioning to decrease humidity. In warm, humid weather, keep basement windows closed. Run the furnace fan continuously to circulate home air. The real key to keeping basement humidity low would be to keep them well ventilated and keep extra moisture from the basement.