This paper describes the guidelines prepared by NIST for GSA. These guidelines are organised by envelope construction system and contain practical information on the avoidance of thermal performance problems such as thermal bridging, insulating system defects, moisture migration problems, and excessive envelope air leakage. For each envelope system, both good and bad practice are discussed with an emphasis on the graphical presentation of envelope design details.
The purpose of this guide is to help the builder understand what causes moisture problems in buildings, how to repair them, and how to avoid them. The guide is divided into two parts. The first discusses the three main approaches to solving moisture problems: Controlling Moisture Sources, the Ai r-Barrier System and the Rain-Screen Principle. The second part is divided into six sections, each dealing with a particular area of the building: attics, wall cavities, basements and crawl space, exterior siding, interior surfaces, and windows.
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