The Professional Association for Air Tightness in Construction (FLiB) has published the first specialized book on the German-speaking market that provides comprehensive information about the air tightness of building envelopes. The range of topics includes insights into the history of building air tightness, a foundational contribution to air quality and the air tightness of buildings from an environmental medicine perspective, and a summary of the subject matter in public and private construction law. Compact overviews of the fundamentals of professional sealing and bonding, the physical relationships of natural and mechanical ventilation, as well as a detailed and practice-oriented guide for high-quality measurements according to DIN EN 13829 complete the work. Its twelve authors are mostly members of FLiB.