This document was developed by the U.S. Environmental Protection Agency, Indoor Environments Division. It provides practical guidance on how to control moisture in buildings.1 It is not a textbook, code or standard. Chapter 1 focuses on principles of moisture how water moves into and within a building and why the movement of water should be controlled or managed. Chapters 2, 3 and 4 provide professionspecific guidance for the design, construction and maintenance phases of a building’s life. To illustrate how core concepts and principles relate to each stage of a building’s life, each guidance chapter contains hyperlinks to relevant principles described in Chapter 1 and other related material throughout the text. Each guidance chapter also includes methods for verifying the appropriate implementation of the moisture control recommendations and a reference section that identifies additional related resources for readers interested in more detailed information. Who Should Read this Guide This guide can be used by anyone who designs, builds, operates or maintains buildings and heating, ventilating and air conditioning (HVAC) equipment. It was developed specifically • Professionals who design buildings and produce drawings, specifications and contracts for construction or renovation. • Professionals who erect buildings from the construction documents. • Professionals who operate and maintain buildings, conducting preventive maintenance, inspecting the landscape, building interior and exterior equipment and finishes and performing maintenance and repairs.