Moisture Control Guidance for Building Design, Construction and Maintenance

The tools and information in this guidance will help keep the air clean where many Americans spend up to 90 percent of their time – indoors.  Some of the biggest threats to indoor air quality stem from moisture issues. Leaking roofs, plumbing problems, condensation issues, poor indoor humidity control, and lack of drainage around the base of buildings are  some of the commonly reported causes of moisture problems in the United States.  These problems can not only threaten the structural integrity of buildings, they can also increase exposure to mold and other biological contaminants. Such exposure is associated with increases in the occurrence and severity of allergies, asthma and other respiratory illnesses.