Finding moisture issues in a basement can be a major source of stress for a homeowner. Basements are meant to be dry. When moisture finds its way inside, dampness and subsequent mold can occur. This not only impacts the functionality of a basement, it can also pose significant health risks for the homes occupants. It is important to address moisture issues promptly; if they are ignored, these issues can compound over time, and grow more serious. When water penetrates the foundation walls, it can ultimately cause detrimental deterioration of materials.

With a variety of possible issues and circumstances, there are several different ways to handle basement moisture. Surface rain run-off is a major contributor to moisture issues in basements. Ground water issues can often be traced to ineffective gutters and downspouts, piping penetrations of foundation walls which were not fully sealed, and incorrectly placed irrigation systems. 

When a homeowner discovers moisture issues within their basement, they will first want to make sure all their gutters and downspouts are effectively routing water well away from the home. Further, the grade of soil should always slope away from the home. Basement windows can also be tested to ensure a watertight seal. In some cases, these tips may be enough to solve moisture problems.

If these tips are not enough to control the moisture entering a home, more aggressive waterproofing measures may be necessary. Below you will find information regarding the two main types of waterproofing – interior and exterior.

All tips above are found in the National Park Service’s Brief 39. For more in depth information on moisture issues throughout your home, as well as steps to take to prevent or manage this, please see: Preservation Brief 39: Control Unwanted Moisture