Dampness also causes building materials and furnishings to develop an unacceptable appearance. However, dampness problems often cause building materials to decay or corrode, to become structurally weakened or lose their thermal capacity, and thus to reduce their useful life. The chapter does not review effects of building dampness that are unrelated to indoor air quality or health.

It starts with a description of how and where buildings become wet reviews the signs of dampness, how dampness is measured, and what is known about its prevalence and characteristics, such as severity, location, and duration discusses the risk factors for moisture problems reviews how dampness influences indoor microbial growth and chemical emissions catalogs the various agents that may be present in damp environments and addresses the influence of building materials on microbial growth and emissions. This chapter addresses those issues to the extent that present scientific knowledge allows. Therefore, an understanding of the relationship of building moisture to microbial growth and chemical emissions is also critical. The interactions among moisture, materials, and environmental conditions in and outside a building determine whether the building may become a source of potentially harmful dampness-related microbial and chemical exposures. From a societal viewpoint, it is necessary to understand how construction, operation, and maintenance practices may lead to dampness problems. From a technologic viewpoint, one must understand the sources and transport of moisture in buildings, which depend on the design, operation, maintenance, and use of buildings in relation to external environmental conditions such as climate, soil properties, and topography.

If dampness-related problems are to be prevented, it is essential to understand their causes.

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