Fixing Basement Wall Cracks From Outside - There are several ways to help avoid moisture damage issues in a basement. The very first rule of thumb is no dirt basements. Though these are somewhat less common in this day in age, it is a good idea to point out this dirt floors not only hold a large amount of moisture but can also give off a variety of gases. When building a basement, make sure you have a floor drain with a trap installed at the bottom point of the floor.
Without a floor drain, any water that's spilled inside cannot escape. Sump pumps are often used where flood due to a high water table may be a problem. 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 generated in the house to the outside. Indications of high humidity include condensation on walls, pipes or other surfaces as well a general sense of moisture from the atmosphere, dampness, and odors. Many times, the humidity is going to be caused by exposing the basement to external air (open windows), having wet laundry hung to dry from the basement, storing firewood from the basement, or a dryer vent that exhausts inside.
To reduce humidity, there are several things a homeowner can do: install energy-efficient windows, insulate walls and cold water pipes, insulate floors if possible, run dryer vents to exhaust directly out and do not dry laundry or firewood in your basement. In summer, use a portable air conditioner or air conditioning to reduce humidity. In warm, humid weather, keep basement windows shut. Run the furnace fan continuously to circulate house air. The real key to keeping basement humidity low would be to keep them well ventilated and keep extra moisture from the basement.