Preservation Brief 39, Holding the Line: Controlling Unwanted Moisture in Historic Buildings

Summary

This is number thirty-nine of 42 preservation briefs prepared by the Technical Preservation Services of the National Park Service. This brief focuses on controlling unwanted moisture in historic buildings.

Uncontrolled moisture is the most prevalent cause of deterioration in older and historic buildings. It leads to erosion, corrosion, rot, and ultimately the destruction of materials, finishes, and eventually structural components. Ever-present in our environment, moisture can be controlled to provide the differing levels of moisture necessary for human comfort as well as the longevity of historic building materials, furnishings, and museum collections. The challenge to building owners and preservation professionals alike is to understand the patterns of moisture movement in order to better manage it-not to try to eliminate it. There is never a single answer to a moisture problem. Diagnosis and treatment will always differ depending on where the building is located, climatic and soil conditions, ground water effects, and local traditions in building construction.

Keywords

Individual & Institutional Roles

Contact(s): Cultural Resource Office, Joint Base San Antonio

Repository(s): Fort Sam Houston

Prepared By(s): Technical Preservation Services, Heritage Preservation Services Program, National Park Service

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